How Many Batteries Do I Need for a 100 Watt Solar Panel
100-watt solar panels are conveniently sized and portable power systems. You can get clean and renewable energy from the sun without breaking the bank.
They work great in off-grid settings like RVs and power several smaller AC appliances.
100-watt solar panels are much smaller than most solar panels that are used in homes. Typically, 100-watt solar panels have size measurements of around 47 x 21.3 x 1.4 inches.
The best way to use your 100-watt solar panel is to hook it up to the right battery. Batteries store excess power to keep your electricity running on cloudy days and at night.
We are here to tell you all about batteries you may need for 100-watt solar panels. You will learn about the types of batteries, and what capacity battery you will need.
We also give you a rundown of the power output of a 100-watt solar panel, and other devices you may need to run your solar setup.
Batteries for 100 Watt Solar Panels
Your solar power installation needs additional devices like batteries, charge controllers, and inverters to function optimally.
Batteries are crucial for running 100-watt solar panels. Always remember to check your 100-watt solar panel specifications to make sure they are suitable for your purposes.
Does Your Solar Installation Need a Battery?
Portable solar systems that make use of 100-watt solar panels can be used on off-grid properties and RVs. If your solar system is at home, on the other hand, then electricity can be imported and exported from the grid when needed.
But without access to power lines, you need another way of storing energy. That is why off-grid solar systems need batteries to function.
Batteries save the excess electricity that solar panels produce during the day. Batteries do not allow electricity to waste and will keep your power running at night and on cloudy days.
What Capacity Battery Should You Get?
Batteries store excess electricity. The bigger the capacity of the battery, the more storage you get. But batteries also shouldn’t be too big.
If your battery capacity is expanded drastically, the capacity of your solar installation would also need to be expanded. Otherwise, it would take very long to charge the battery.
For a 100 watt solar panel, a 100 Ah 12V battery would work well.
Remember that your power input needs to roughly match your power output. A 100 Ah 12V battery provides around 50% usable storage.
That is why your battery should be able to store at least twice the daily output of your solar panel. As a general rule of thumb, your 100-watt solar panel can deliver 30 amp-hours per day to your battery with 5 – 9 hours of sun exposure.
This is where it becomes important to calculate your usual power usage and to assess your electricity needs.
How Many Batteries Do You Need?
If you use a 100 Ah 12V battery, you should be good to go with only one battery.
You may assess your power needs for your solar setup and find that you need a larger battery or two batteries.
Keep in mind that one 100Ah 12V battery will do the job with one 100 watt 12V solar panel. If you get a larger battery or more batteries, you will probably have to expand your solar array too.
Why? While one 100 watt solar panel can charge a 100Ah 12V battery with ease, it may take a very long time to charge larger batteries or more batteries. That is why you would need to expand your solar setup.
Types of Batteries
Solar setups usually use deep cycle batteries, because they are designed for prolonged and repeated cycles of charging and discharging.
Deep cycle batteries are used to store and distribute the energy generated by your solar panels. The higher the capacity of your battery, the more energy can be stored.
Deep-cycle batteries can be discharged completely without obtaining damage as easily as normal batteries.
Lead Acid Batteries
Lead-acid batteries are the most cost-effective energy storage option and are commonly used in RV solar setups.
You should not run your lead acid battery below 50% capacity. You should have a solar battery with the capacity to store twice the daily amount of your panel’s output.
If you want to sustain your battery to make it last long, avoid letting the battery drop under 50%.
Lithium-ion batteries are much more expensive than lead-acid batteries and less common in RVs. These batteries have a longer lifespan and can store more energy than lead-acid batteries in a smaller space.
Lithium-ion batteries can be discharged almost completely. Your battery should have a storage capacity just a bit over the daily output of your solar panel.
Make sure you know how to install a 100-watt solar panel with lithium-ion batteries. Lithium-ion batteries tend to catch fire if it is not set up correctly.
Charging 12V Batteries With 100 Watt Solar Panel
You can charge 12V batteries with a 100-watt solar panel. The time this would take depends on the capacity of the battery and sunlight exposure.
A rough estimate would be that it can take between 10 – 14 hours to fully charge the battery.
For faster and more effective charging your solar panel should face the sun without obstacles in between.
How Much Power Does a 100 Watt Solar Panel Produce?
The output of a 100-watt solar panel depends on a few factors. The amount of sunlight and the angle of the solar installation will influence the output.
On a sunny summer day, your 100-watt solar panel may have an output of around 600 – 700 watt-hours over 24 hours.
In the winter and on overcast days the output may be as low as 100 watt-hours over 24 hours.
100-watt solar panels produce around 5 to 6 amps of power per peak sun hour. In direct sunlight, this would amount to around 30 amp-hours per day.
The ‘maximum current’ rating of a 100-watt solar panel is 5.5 – 6 amps. Solar panels produce a number of amps between 50 – 100% of the value of the maximum current rating, under normal conditions.
Devices That Can Run Off a 100 Watt Solar Panel
100-watt solar panels can run many home AC appliances that make your life easier when you are on the go. Here are some electricals that will run with a 100-watt solar panel.
- Ceiling fans.
- Lamps and lighting.
- Wi-Fi Routers can be powered for a whole day.
- LED lights.
- Charge smartphones or tablets.
- Small LCD TV set.
- Cable box and satellite dish.
- Alarm clocks.
This will not work for appliances like larger air conditioners, refrigerators, microwaves, hairdryers, electric kettles, and large TV sets. If you want to run these appliances you would have to know how to connect 2 100 watt solar panels or more.
If you want to connect solar panels to expand your setup, you would need a lot of additional equipment – solar power mounting brackets, solar panel cables, and fuse holders are just a few.
You would also need to be clued up on what gauge wire for 100-watt solar panels are the most suitable before you can wire your setup.
Other Devices for Your Solar Setup
Solar Charge Controller
Solar charge controllers are portable devices that regulate the current and voltage of your solar setup.
They regulate power flow, charge batteries, and run electrical loads, and manage the flow of energy between your solar panels and batteries.
What size charge controller do I need for a 100-watt solar panel ? A safe bet would be to have a 10-amp charge controller for a 100W solar panel with a 12V battery bank.
Inverters work to convert the electricity flowing from your battery from direct current (DC) into alternating current (AC).
What size inverter do I need for a 100-watt solar panel ? A rule of thumb is that you have to choose a model of inverter with a capacity larger than the true power output you would need.
The capacity of the inverter needs to be 10% to 20% higher than your largest power load.
You would need a 12v DC to 220v AC, 200W inverter.
Did you find our blog helpful? Then consider checking:
All You Need To Know About Harbor Freight Solar Panels
Harbor Freight solar panels are a popular choice for those looking for an affordable and reliable solar panel. But Harbor Freight is largely known as a discount tool shop so I wanted to do a little digging into their solar products. So I hopped in the car, drove to the local harbor freight…and did a little digging online…and got some answers.
Are Harbor Freight Solar Panels Any Good?
In general, Harbor Freight solar panels rate as highly as comparable solar panels on the market. Some even prefer harbor freight solar panels to more expensive options.
It’s a fair question to ask considering Harbor Freight is known for discount tools more than anything.
It is important to note that the solar panels Harbor Freight sells are NOT meant as a home energy solution as they mainly offer 100 Watt panels which are more suited to charging devices or powering small appliances.
Most people that use these set them up as supplemental power for a shed or garage or perhaps as an off-grid solution to help power a few things at a cabin or while camping.
What Makes Harbor Freight Solar Panels So Good?
For starters, they’re incredibly affordable. You can find a 100-watt panel kit for about 120, which is an incredible price for a quality solar panel. Users have also mentioned that they are easy and straightforward to install. Additionally, the panels are also very durable and long-lasting, as shown in this video:
Small Solar Panel
How Many Amps Will A 100 Watt Solar Panel Produce?
Generally, a 100 watt solar panel produces an average of about 6 amps per peak sun hour, or about 33 amp-hours per day.
The key word up there is “peak sun hour,” this means that the solar panel is getting direct sunlight and is not being obstructed by things like trees, buildings, or clouds.
It also means keeping your solar panel clear of dust, snow, and leaves, as these can all obstruct sunlight and reduce the amount of power your solar panel produces.
Are Harbor Freight Solar Panels Water Proof?
Harbor Freight solar panels are not classified as waterproof but are considered weather resistant and can withstand rain, snow, and sleet. This means the panels can withstand exposure to water, but water should not be allowed to pool and they should not be submerged.
It is important to note that the solar panels should not be installed in an area where they will be constantly exposed to water, such as under a gutter or on a flat roof, as this can cause the panels to degrade over time.
This also means that they should not be permanently mounted on a roof like standard photovoltaic solar panels. Those have a much more durable construction and are designed to be exposed to the elements for years.
If you live in an area where it snows, it is important to clean the snow off of the panels so that they can absorb sunlight and generate power.
How Long Do Harbor Freight Solar Panels Last?
The lifespan of a solar panel is typically 20-25 years, but this can vary depending on the quality of the panel and how well it is maintained. Harbor Freight solar panels are made with high-quality materials and are designed to withstand exposure to the elements, so they should last for many years.
However, it is important to note that the panels should be cleaned regularly to ensure they are able to absorb sunlight and generate power efficiently.
Additionally, the panels should be inspected periodically for damage, such as cracked glass or loose connections, and repaired as necessary.
How Much Are Harbor Freight Solar Panels?
On average, a 100 watt solar panel from Harbor Freight will cost between 120 and 180 dollars. Other wattage outputs and size of the panel can vary the cost a bit.
Harbor Freight also offers solar panel kits that include multiple panels, an inverter, and a charge controller. Their 100 Watt kit runs 190 and a battery will set you back an additional 75.
Harbor Freight solar panels are a good option for those looking to save money on their energy costs. The panels are made with high-quality materials and are designed to withstand exposure to the elements, so they should last for many years.
Additionally, Harbor Freight offers solar panel kits that include multiple panels, an inverter, and a charge controller.
How To Connect A Solar Panel Bought At Harbor Freight To A Jackery Explorer Power Station
Solar panels can be bought at a lot of different places nowadays, the popular hardware store Harbor Freight is one of those places.
A Harbor Freight solar panel is not compatible with a Jackery power station directly out of the box though since it requires additional adapters.
Related Product: Extend the cable between the solar panel and the power station with an SAE extension cable by iGreely (click to view on Amazon)
In this article I am going to tell you what these connectors are called, and how you go about connecting the two.
What You Need To Know
Before we get into the specifics, there are some things we need to know before we connect anything.
Solar Charge Controller
The job of a solar charge controller is to take the voltage and amperage generated by a solar panel and regulate it. Then it sends the regulated electricity off to the battery.
Portable power stations have built-in solar charge controllers so you can connect solar panels directly to them.
The Jackery Explorer is not going to charge if you use two charge controllers. Therefore, we should not buy a solar panel that has an external solar charge controller.
If you have already bought a panel that included a solar charge controller, you can (hopefully) simply not use it. If it’s hardwired to the solar panel you’re going to have to either bypass it, or buy a different panel.
Not all solar charge controllers are the same. They have different input ratings, meaning that they accept different voltages and amperages.
The input ratings can usually be found in the manual of the power station, or by the port on the power station.
Most Jackery Explorer power stations can handle voltages between 12-30V, and a typical 100W 12V solar panel like the most popular one from Harbor Freight outputs around 18V which makes it compatible.
If you combine two or more panels, you’re going to increase either the voltage or the amperage but we will get to that later on.
While it’s OK to exceed the amperage to a certain point, you should never exceed the max input voltage.
The Harbor Freight Solar Panels – What Connectors Do They Use?
Most solar panels sold by Harbor Freight today use SAE connectors. This is a two-conductor DC connector that is easy and quick to connect/disconnect, which makes it a great connector for a solar panel.
SAE connectors have one male pin and one female pin. One is positive and one is negative, but which is which depends on the wiring and adapters used.
The panels from Harbor Freight that use SAE connectors I have looked at have a positive female pin and a negative male pin. This is important when we search for the right adapter.
A positive wire is often red and a negative wire black. The wires are not different from one another other than the color, which is only made this way to make it easier to connect and follow the wire.
You might find a connector with a small “” or “-” on it, with a cable color that makes it look like it’s the opposite of what the connector says.
This is nothing to worry about, as long as you can follow the wire and make sure that the positive output ends up with a positive input.
The Jackery Explorer Input And The Adapter You Need
The input on Jackery Explorer power stations is called an 8mm connector. This is a round connector which also has a positive and a negative part to it.
Since we know that the SAE connector has a positive female pin and a negative male pin, we need an adapter that has the opposite.
This adapter includes what is called an SAE reverse polarity adapter, which will reverse the positive and negative. You do not need to use that to connect the panel to an Explorer power station.
Note that if you have the newer Explorer 1500 (click to view on Amazon), you are going to have to use the adapter included by Jackery to connect the adapter above to the power station.
That’s because Jackery has created a proprietary 8mm input for the Explorer 1500, and even though it’s called an 8mm input it’s slightly different from the regular 8mm connector used by other manufacturers.
When you have the adapter, you simply connect the solar panel to the adapter, then connect it to the power station.
Combining Two Or Panels To Increase The Charging Speed
It’s possible to combine two or more panels to charge the battery faster, but it’s not always worth doing so.
Since the charge controller in the power station decides how many watts it’s going to use to charge the battery, it’s good to know these limitations before spending money on more panels.
For example, the Explorer 160, 240, 300, and 500 max out at around 50-80 watts depending on model. The larger Explorer 1000 max out at 127W, and the even larger 1500 at 300W.
A 100W 12V solar panel will generate around 70-80W in sunny conditions.
It’s not always perfectly sunny though, and if you’re going to use the panels where it’s often cloudy it might be more worth it to buy an extra panel or two.
To combine two Harbor Freight panels for the Explorer power stations, you need an adapter like this by SolarEnz (click to view on Amazon).
This adapter also includes the SAE reverse polarity adapters, which you might need to ensure that positive goes to positive and negative to negative.
When you combine panels in parallel like this it’s very important that you have made sure that all wiring used can handle the amperage. That includes these adapters and extension cables.
I recommend using SAE extension cables that come with caps to protect the connectors while not in use. These dust caps keep dirt, debris, and moisture out.
The thicker the cable the better, so look for the lowest gauge you can find and make sure it can handle the total amperage of your panel(s).
I like and recommend the iGreely SAE extension cables (click to view on Amazon). They come in different lengths and are compatible with the adapters I have linked to above.
While you can combine two shorter extension cables I suggest getting a long one instead. The more connections, the higher the voltage drop, which will decrease the total output to the power station.
Frequently Asked Questions
I’m not sure whether the polarity is correct or not!
You can use a multimeter to check the polarity of the wires. This is also helpful when troubleshooting a setup that’s not working correctly.
A digital multimeter like this one by Kaiweets (click to view on Amazon) works, just set it to four o’clock (20 by V DC) and stick the red test lead in the supposedly positive SAE connector on the panel/adapter.
Then do the same with the black test lead. If it shows a positive voltage on the little screen, you know it’s wired correctly. You can test it the opposite way to understand what it looks like if the polarity is reversed.
How long will it take to charge my Explorer power station?
It depends on how big the power station is in watt-hours. A 100W panel will generate around 70-80W, but if your power station has a max input of 65W you need to do a calculation based on that.
For example, the latest Explorer 500 (click to view on Amazon) has a battery capacity of 518Wh and maxes out at around 70W.
The way to calculate how long it would take to charge the Explorer 500 with a 100W solar panel is then: 518/70=7.4 hours.
We also need to consider the fact that the charge controller will start out charging the battery fast, then slow down as it is getting closer to a full charge.
Therefore, I would add another hour or two to the estimate to get a more accurate number, resulting in 8-9 hours for a full charge.
How much can I go over on the amps?
While I personally don’t recommend going over 150% of the maximum amps with an Explorer power station, Jackery do not recommend going over on the amps at all.
For warranty reasons you should stick to what the manufacturer says.
Some charge controllers are more sensitive than others, but I haven’t had any problems using 200W of solar with my Explorer 500 for a couple of years.
Are Harbor Freight solar panels waterproof?
The junction box on the back of the panel is water-resistant, and the SAE connectors should withstand rain as long as they’re connected to another SAE connector or has the cap on.
I would ask Harbor Freight to be sure though, since it might void your warranty if it’s damaged due to rain and/or dust.
Can I combine a Harbor Freight solar panel with a panel by different manufacturer?
You can, but I don’t recommend doing so. The reason for that is that the setup is going to limited by the voltage of the lowest-rated panel.
If you have two panels that are rated similarly you won’t lose much, but be aware of the limitations.
Please leave a comment down below if you have any questions or experience with this and have something to add.
Jesse has always had an interest in camping, technology, and the outdoors. Who knew that growing up in a small town in Sweden with endless forests and lakes would do that to you?
6 thoughts on “Connect A Harbor Freight Solar Panel To Jackery Explorer”
I can’t get the harbor freight 100 W solar panels to charge the Jacari 1000. I’ve use both the 8 mm and the two prong adapter but still does not register. Not sure what else to do. Reply
Hi, Do you have a multimeter so you can test the connections? It’s likely a loose connector or a polarity problem. Reply
Can I charge a Jackery Explorer 240 with a 100 watt solar panel from HF? The one I’m looking at is the THUNDERBOLT SOLAR 100 Watt. The Jackery 240 is sold with their 60w solar panel. Is it safe to connect the HF 100 to the J240? Reply
Hi, Yes, it’s compatible and will work great with the Explorer 240. You just need the SAE to 8mm adapter (click to view on Amazon). Looks like the polarity lines up correctly, so I don’t think you need to use the included SAE reverse polarity adapter. Reply
Connecting Solar Panels Together
Connecting solar panels together is a simple and effective way of increasing your solar power capabilities. Going green is a great idea, and as the sun is our ultimate power source, it makes sense to utilize this energy to power our homes. As solar power becomes more accessible, more and more homeowners are buying photovoltaic solar panels.
However, these photovoltaic solar panels can be very costly so buying them over time helps to spread the cost. But the problem then becomes how do we connect these extra solar panels together to increase the voltage and power output of what’s already there.
The trick here when connecting solar panels together is to choose a connection method that is going to give you the most energy efficient configuration for your particular requirements.
Connecting solar panels together can seem like a daunting task when you first start to look at how it should be done, but connecting multiple solar panels together is not that hard with a little thought. Wiring solar panels together in either parallel or series combinations to make larger arrays is an often overlooked, yet completely essential part of any well designed solar power system.
There are three basic but very different ways of connecting solar panels together and each connection method is designed for a specific purpose. For example, to produce more output voltage or to produce more current.
Solar photovoltaic panels can be electrically connected together in series to increase the voltage output, or they can be connected together in parallel to increase the output amperage. Solar pv panels can also be wired together in both series and parallel combinations to increase both the output voltage and current to produce a higher wattage array.
Whether you are connecting two or more solar panels, as long as you understand the basic principles of how connecting multiple solar panels together increases power and how each of these wiring methods works, you can easily decide on how to wire your own panels together. After all connecting solar panels together correctly can greatly improve the efficiency of your solar system.
Connecting Solar Panels Together in Series
The first method we will look at for connecting solar panels together is what’s known as “Series Wiring“. The electrical connection of solar panels in series increases the total system ouput voltage. Series connected solar panels are generally used when you have a grid connected inverter or charge controller that requires 24 volts or more. To series wire the panels together you connect the positive terminal to the negative terminal of each panel until you are left with a single positive and negative connection.
Solar panels in series add up or sum the voltages produced by each individual panel, giving the total output voltage of the array as shown.
Solar Panels in Series of Same Characteristics
In this method ALL the solar panels are of the same type and power rating. The total voltage output becomes the sum of the voltage output of each panel. Using the same three 6 volt, 3.0 amp panels from above, we can see that when these pv panels are connected together in series, the array will produce an ouput voltage of 18 Volts (6 6 6) at 3.0 Amperes, giving 54 Watts (volts x amps) at full sun.
Now lets look at connecting solar panels in series with different nominal voltages but with identical current ratings.
Solar Panels in Series of Different Voltages
In this method all the solar panels are of different types and power rating but have a common current rating. When they are connected together in series, the array produces 21 volts at 3.0 amps, or 63 watts. Again the output amperage will remain the same as before at 3.0 amps but the voltage output jumps to 21 volts (5 7 9).
Finally, lets look at connecting solar panels in series with completely different nominal voltages and different current ratings.
Solar Panels in Series of Different Currents
In this method all the solar panels are of different types and power rating. The individual panel voltages will add together as before, but this time the amperage will be limited to the value of the lowest panel in the series string, in this case 1 Ampere. Then the array will produce 19 Volts (3 7 9) at 1.0 Ampere only, or only 19 watts out of a possible 69 watts available reducing the arrays efficiency.
We can see that the solar panel rated at 9 volts, 5 amps, will only use one fifth or 20% of its maximum current potential reducing its efficiency and wasting money on the purchase of this solar panel. Connecting solar panels in series with different current ratings should only be used provisionally, as the solar panel with the lowest rated current determines the current output of the whole array.
Connecting Solar Panels Together in Parallel
The next method we will look at of connecting solar panels together is what’s known as “Parallel Wiring“. Connecting solar panels together in parallel is used to boost the total system current and is the reverse of the series connection. For parallel connected solar panels you connect all the positive terminals together (positive to positive) and all of the negative terminals together (negative to negative) until you are left with a single positive and negative connection to attach to your regulator and batteries.
When you connect solar panels together in parallel, the total voltage output remains the same as it would for a single panel, but the output current becomes the sum of the output of each panel as shown.
Solar Panels in Parallel of Same Characteristics
In this method ALL the solar panels are of the same type and power rating. Using the same three 6 Volt, 3.0 Amp panels as above, the total output of the panels, when connected together in parallel, the output voltage still remains at the same value of 6 volts, but the total amperage has now increased to 9.0 Amperes (3 3 3), producing 54 watts at full sun.
But what if our newly acquired solar panels are non-identical, how will this affect the other panels. We have seen that the currents add together, so no real problem there, just as long as the panel voltages are the same and the output voltage remains constant. Lets look at connecting solar panels in parallel with different nominal voltages and different current ratings.
Solar Panels in Parallel with Different Voltages and Currents
Here the parallel currents add up as before but the voltage adjusts to the lowest value, in this case 3 volts or some voltage value very close to 3 volts. Solar panels must have the same output voltage to be useful in parallel. If one panel has a higher voltage it will supply the load current to the degree that its output voltage drops to that of the lower voltage panel.
We can see that the solar panel rated at 9 volts, 5 amps, will only operate at a maximum voltage of 3 volts as its operation is being influenced by the smaller panel, reducing its efficiency and wasting money on the purchase of this higher power solar panel. Connecting solar panels in parallel with different voltage ratings is not recommended as the solar panel with the lowest rated voltage determines the voltage output of the whole array.
Then when connecting solar panels together in parallel it is important that they ALL have the same nominal voltage value, but it is not necessary that they have the same ampere value.
Connecting Solar Panels Together Summary
Connecting solar panels together to form bigger arrays is not all that complicated. How many series or parallel strings of panels you make up per array depends on what amount of voltage and current you are aiming for. If you are designing a 12 volt battery charging system than parallel wiring is perfect. If you are looking at a higher voltage grid connected system, than you’re probably going to want to go with a series or series-parallel combination depending on the number of solar panels you have.
But for a simple reference in regards to how to connect solar panels together in either parallel or series wiring configurations, just remember that parallel wiring = more amperes, and series wiring = more voltage, and with the right type and combination of solar panels you can power just about any electrical device you may have in your home.
For more information about Connecting Solar Panels Together in either series or parallel combinations, or to obtain more information about the different types of solar panels available, or to explore the advantages and disadvantages of using solar power in your home, then Click Here to order your copy from Amazon today and learn more about designing, wiring and installing off-grid photovoltaic solar electric systems in your home.
Find Us On
- DC Water Heating
- Battery Charge Controller
- Parallel Connected Solar Panels
- Series Connected Solar Panels
- Measuring the Power of a Solar Panel
- Solar Irradiance
- Understanding Batteries
- DIY Solar Power System
On Sale Now Bestseller No. 1 Photovoltaic Design Installation For Dummies 13.77
On Sale Now Bestseller No. 3 Photovoltaics: Design and Installation Manual 29.45
On Sale Now Bestseller No. 4 Photovoltaic Systems 119.99
Please Speak up!
We hope this Connecting Solar Panels Together tutorial was useful and informative for you. Are you ready to share your thoughtsand experience with us and many others. Your Комментарии и мнения владельцев are always welcome, just post them in the section below.
P.S. Don’t forget to like, rate, and share this Alternative Energy Tutorials post. Thank you for using our website.
0 Комментарии и мнения владельцев already about “ Connecting Solar Panels Together ”
I have read on the web that there should be a diode (blocking reverse flow of current) inserted between PV panels arranged in parallel. I have two small 12v panels (50W 30W) and I want to chain them in parallel to get 80W @ 12v. Do I have to put a diode somewhere in the wiring between the panels and the battery? Or just between the two panels?
Hi I have 4.2 kw controller(ups) and 8 solar panel of 545 watt each. each panel 48 volt. each panel current is 10 amp at its peak Now. i have a question How can i arrange these panels to get max output? If i put 6 panel in series and 2 panel in parallel then connect these together. what is my output ? I require max output Kindly guide me
hello some advice please i have 4 x 235w panels voc 37v rated 29.5v to power 4 x 130 ah wet battery bank wired series and parallel via a 100amp mppt controller and 24v 6000w invertor would i be better off wiring the panels in parallel or series thanks for your help and advice
Please I have 2 Panels 270Watts each, connected to a charge controller that charges a 12Volts 200AH battery. I just bought another 2 Panels 300Watts each to be connected together with the existing system. I am thinking if I pair 270W panel with 300 W panel in series before connecting them all in parallel will reduce the loss?
We expect that there would be very little difference in the I-V characteristics between your 270W and 300W panels, as there is such a small difference in wattage, 270W compared to 300W. Thus the Vmp and Voc voltages would be very similar. But the Imp and Isc values would be more different. Then 2 x 270W in one series string, and 2 x 300W in a second series string, with both strings in parallel. That way the voltages would balance out but you would still get different branch currents relating to the wattages.
Currently, I have a 24v system with 24v panels connected in parallel. I want to step down to 12v system without changing the 24v panels, I just want to buy one 12v panel and connect in parallel. 1) What is the effect of 12v panel besides reducing the voltage output of other 24v panels to 12v? 2) Would the 24v panels retain their qualities in case I return to the 24v system after a few years?
1) It does not work like that. Your output would be around 18 volts and your 24 volt panels would be feeding current directly into the smaller 12 volt panel due to such a large mismatch. 2) Probably not, as they would deteriorate over time anyway, and would see your 12 volt panel as the load
Ok. Can I step the 24v panels down to 12v using my PMT 12v/24v Charge control? I want to scale down to 12v without throwing my active panels into the bin.
Hi If I got 2 x 200w Omega OSP201 Panels connected in series VOC – 22.2; SCC(A) – 8,6; VMP(v) – 18; Max VMP – 8,11 Connected to 2×180 amp/h batt in Paralel with 2000w Pure Sine inverter and 20 Amp Solar control charger. Is it the correct way? Thank you, I’m following
I have 24 x 230 W 37 volt 7.8 Amp panels. In order to fit these panels into my all-in-one EGR 120/240 6000 inverter I have to have a 500 volt max. I believe the only way to meet the 500VOC max requirement, I would need to wire 12 panels in Series and 12 panels in Parallel giving me 12 x 7.8 = 93.6 amps and 37 volts in Parallel 12 x 37 Volts = 444 Volts and 7.8 Amps in Series Can I combine the 2 Arrays?
12 panels in parallel with 12 panels in series, No. 12 panels in one series string equals 444 volts, and 2 series strings in parallel (12S2P) equals 15.6 (7.8 7.8) amperes.
If I connect two 18v panels in series creating 36v output, then connect this array in parallel with two other 36v panels, if one of the 18v series panels is in shade, how will it affect the total output.
The connection solar Panels was useful to me, so I am saying thank you, and hope to learn more from you
Hi I have a few 70 volt solar panels and they are very low amperage, I want to Connect to batteries however don’t as yet have an inverter, how are inverters rated and are there inverters that will take high voltages and give 12volt battery Charging Outputs,? I see many 12 volt and 24 volt inverters but cant seem to find one that accepts 70 plus volts input, these panels were sold with LED lights and i was told to connect 3 lights to one panel and they will act as day time down lights but there is no voltage on the light fittings and was told less than 3 lights will be too little and the panels out put would blow them up, so I decided not to operate this way as it sounds unsafe instead I want to use the panels to Charge batteries but the High voltage output is Confusing as other panels I used had 6-12 volt output not 70 volts
It seems you are confused. Solar Charge Controllers, also called Battery Charge Controllers take the voltage and current generated by photovoltaic panel(s), and/or wind turbine generators and produce a standard output voltage of between 12 to 48 volts DC (depending on model) used to charge a single battery or a larger battery bank. The configuration and wattage of any connected pv panel, or array would depend on the DC input characteristics of the contorller. Inverters take the DC voltage and convert or invert (hence their name) it into AC mains voltage and power, either single-phase 240V or 3-phase for use in the home or to feed the incoming mains power. Thus you would have two different controllers, one to produce the required DC voltage, 12V, 24V, etc. from the panels and another to create the higher mains AC voltage for the home. Nowadays, there are all-in-one MPPT Solar Regulators or System Voltage Controllers which have both units within one controller. Again, the DC input and power rating of the regulator will decide how you configure your panels, or array.
Thanks for that one last question the panels are 67.9v at 1.07 amps and 72.5 watts how is the best way to wire them all in Parallel, or 3 in series 3 in series then both sets of 3 in Parallel? I am thinking all 6 in Parallel from my Understanding is there a calculation for the best size Battery or number of Batteries that this will Charge? Thank you for your assistance
If your panels are rated at 70 watts each, and you state you have 6. Then that gives a total of 6 x 70 = 420 watts. This 420 watts is ONLY available during “full sun” conditions, about 4 to 5 hours per day. Thus assuming 4 hours gives 4 x 420 = 1680 watt-hours per day. Since its a DC system, watts are equal to volt-amperes (VA) in this case. Thus you have 1680 VA per day max. Assuming a 12 volt system, that equates to 1680/12 = 140 amp-hours per day max. Assuming a 50% depth of charge per day, then you would need a 280 Amp-hour battery. That is, your battery discharges to 50% capacity each day, and your panels recharge it during the 4 hours of full sun. Clearly, system losses and efficiency are not considered here.
I have two 100ah 12v batteries connected in parallel. I have a 100 watt thunderbolt solar kit connected to both batteries. I plan to add another 100w solar panel kit. Should I connect each solar kit to both batteries or connect one kit to a single battery and the other kit to the other battery?
Solar kit implies panel and charge controller. Then it is not advisable to connect two or more charge controllers to the same battery terminals as they will compete against each other and the battery bank may not be charged or protected correctly. Instead connect all the pv panels to the input of one battery charge controller.
not connect in paralel,you just connect your batteris in series and connect the pannels in series in order to increase the current,your system will run perfectly
Incorrect information. Series connection increases voltage, not current. He has a 12 volt system, not a 24 volt system
Hi there,I have 2x 330w in parallel with 36v,20a output.Can I run this through a 24v, 20amp. 440 watt voltage inverter/dropper/converter??
Please bear with me, I man not a total newby, but I do still have a lot to learn about this… I am changing / adding to my RV solar system. It currently has a single panel that I think is 175 watt with a 30 amp PWM controller and 2 12-volt 100 AH RV batteries that were not properly maintained and need to be replaced. Controller and batteries will get changed out, as I change/add panels on the roof and upgrade the wiring to the controllers and battery bank. I want to build the system so I can add to it in equal increments as I discover just how much power I need and if needs change. (Unit not yet in my possession so I don’t know exactly how I will be consuming power.) My original plan was to build the system with three 200-watt panels and a 60 amp MPPT controller (or 2 panels and a 40 amp controller), keeping everything balanced and add to the system in these increments. I have plenty of room for controllers and batteries, with a fair amount of room on the roof and plan on using Tilt Brackets to maximize collector exposure This is where I fall down…. Panels in Series or Parallel? Parallel would give me 27 volts. Series would give me 81 volts. I would really like to stay with 12-volt system so I don’t have to change anything else in the RV, Can this be done with the higher voltage / lower current feeds from the panels? Will the controllers be able to take the higher voltage and adjust accordingly or should I go with the lower voltage and higher current? Also, I don’t yet know at what my Charger/Inverter is rated at so I may have to change that as well. At this point the only thing I have purchased is batteries that were removed from my previous RV’s system. These are FLA 6-volt GC2 batteries that were connected in series/parallel giving me 12 volts, 420 AH (allowing for a 50% draw-down), giving me 210 AH. I will eventually switch over to Li Batteries and add additional cells as the system increases I am considering 200 Watt panels, up to 2000 watts MAX. The manufacturers spec’s on these panels have a Voc of 27 volts, Short Circuit Current of 9.66 amps. In your opinion, would I be better to consider more panels with a lower wattage (100 watts) or continue with the 200 watt panels? This is a large RV and mostly Boondocking / Dry Camping expected for 1 night stays and up to 2 weeks or more. (I have a portable generator, but would prefer to use it only when necessary).
The size of chosen panels would depend on the available installation space as 2 x 100W panels would take up about 40% more area than one single 200W panel. The configuration of your 2kW array would depend on the DC input characteristics of your charge controller. Higher voltage and lower current would be the preferred option as lower current means smaller diameter cables. Your 60 amp MPPT controller may have a DC input voltage of 150VDC, then your panels Voc of 27 volts would mean 5 panels in one series string (5 x 27 = 135V) and two parallel branches (5S2P) giving a Isc of 19.32 amperes (2 x 9.66) for your 2kW (10 x 200W) array. Clearly, you would need to consult your charge controllers specifications first.
I have 12 – 250 Watt solar pannels. Voc 37.6 and Rated current 8.27 Amps I have a 80A MPPT solar charge controller wit a Max PV input 2000W (Max. PV Array OV). I Have 24V 3KVA, with input voltage 65-140VAC/95-140VAC. Wich would be the ideal way to set up the solar panels to produce the most for my battey bulk and inverter?
We assume you have bought the solar items you have bought for a reason because you have some knowledge or have been previously advised. If not or you have no idea what you are doing but want us to tell you. Clearly, a 250W panel is for 24 volt battery charging. Thus 2000/24 = 83 amperes as you have stated. Then you need a 48 volt system with 6 branches of two panels per string. This would give a maximum array Voc of 75.2 volts, and a maximum array current of 50 amperes.
I have two panel 545 watt and one panel 150 watt l have 2.8 kva inverter 24watt how I connect these panel serial or parallel.
Clearly with such a large mismatch between panels, you cannot use the 150W panel with the two 545W panels.
All is spoken and all is said ,but I just want to know we have six 150watts panels,a 60A charge controller and 4 200A batteries which right way would you recommend us to use in connecting the panels and the batteries /which installation style will give something that is better that we may be able to use a 240-300 volts inverter and 60 12volts bulbs
You have 6 x 150 watt panels. Then you have a total of 900 watts maximum at full sun, no matter how you connect them. 150W panels are for charging 12 volt batteries, thus their Vmp is usually about 18 volts. 3 x 18 = 54 volts plus 25% for Voc equals about 68 volts. If your 60A charge controller can handle a maximum DC input of 68 volts, then 3 panels in a series string, and 2 parallel branches (3S2P). If not, 2S3P. Your 12 volt light bulbs will require a 12 volt supply from the 12 volt batteries. Then your 4 batteries are connected in parallel.
If both solar panels (120w and 200w) have a charge controller fitted do I need to remove one of them to charge two 12v 105A batteries
Each panel can be used to charge a single battery. But as the characteristics of each panel is different, each battery will charge at a different rate.
or join the the wiring below the two controllers to the battery bank. in this way should one panel, controller or wiring fail, the other panel will carry the load
Hi I have 8 solar panel of 545 watt each. each panel 48 volt. each panel current is 10 amp at its peak Now. i have a question How can i arrange these panels to get max output? If i put 6 panel in series and 2 panel in parallel then connect these together. what is my output ? I require max output Kindly guide me
I have 3x 215 watt panels victron. using a 50amp victron controller i will be fusing a 50amp from controller to battery.can you tell me do i need to fuse each panel to controller or can i just use one fuse.which size fuse.plus what would you recommend series or parallel.many thanks.
215 watt panels are generally for 24v systems, thus have an output voltage of around 36 volts. 215w/36v equals about 6 Amperes. 3 in series equals about 108 volts (check panel specs for max Voc). If you controller can handle upto 120VDC input go series at 6 amps. If not 3 in parallel at 36 volts, 18 amps at full sun. For series, obviously one fuse. For parallel, one fuse per branch (panel) if you want, or just one for the whole set.
If I have two solar pannes of same voltage(18v×2) but different amperes(80w,120w) and I use two different charge controller on one battery of 150AH.will my connection add up as expected?