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Grid Tie Solar. On grid pv system

Grid Tie Solar. On grid pv system

    Grid Tie Solar

    A grid tie solar PV system is the easiest and least expensive way to use clean solar power at your home or business in most cases. This is generally true for two reasons:

    • Equipment and installation costs are lower because battery backup (and its associated chargers, monitors, breakers, etc.) is not required, and
    • Many electric utilities offer net metering. a legal agreement in which unused power from your solar panels is automatically sold to the grid, creating credit on your utility bill at the same per-kWh price you pay for the power you draw from the grid.

    With a grid tie solar system, your electrical demand will be satisfied first and foremost by your solar panels. When your panels can’t meet your demand (at night or during heavy overcast weather), electricity from the grid will be used instead. seamlessly and without the need for you to do anything. This means that in most grid-tied solar systems, the electrical grid replaces the battery backup portion of a system that would be required for off grid solar setups.

    Free Grid Tie Solar System Quote

    Fill out our online form and our expert solar technicians will work up a free grid tied solar power system design and quote for you.

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    Off-Grid Solar System

    All solar power systems work on the same basic principles. Solar modules first convert solar energy or sunlight into DC power using what is known as the photovoltaic (PV) effect. An off-grid solar energy system is not connected to the utility grid, whereas an on-grid solar energy system is connected to the utility grid. Your choice of an off-grid system or on-grid system will determine your access to electricity, what equipment is needed for excess production, what happens when the grid goes down, and how you’re billed for electricity. In this article, we will be looking into the main components used in off-grid systems.

    Off-Grid system types. AC or DC coupled

    Off-grid systems are built using either AC or DC coupled power sources. AC-coupled generation sources include common solar inverters while DC-coupled sources include MPPT solar charge controllers. Whether a system is AC or DC coupled is generally based on the size of the system. Most small-scale systems are DC coupled and use efficient MPPT solar charge controllers. Larger off-grid systems can be either AC or DC coupled depending on the type of off-grid inverter-charger used, and compatibility with different solar inverters (AC) or solar charge controllers (DC).

    Off-Grid Battery Banks

    Off-grid batteries should charge efficiently so as not to waste valuable energy generated by the solar array or a diesel generator. Off-grid batteries need high power capability to support the high surge draw, discharge and charge current of off-grid inverter chargers. Access to off-grid sites is not always easy, so a maintenance-free battery is highly desirable. Temperature changes must be considered as this will affect the lifetime of the battery.

    State of Charge (SoC) is the level of charge of an electric battery relative to its capacity. The units of SoC are percentage points 0% = empty; 100% = full. SoC is normally used when discussing the current state of a battery in use. Off-grid solar battery systems will be deeply cycled and regularly operated in a partial state of charge (PSOC) condition. So, SoC monitoring is critical for off-grid users.

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    Lead Acid Battery vs. lithium-Ion Battery in Off-Grid

    This all boils down to the number of cycles a battery has and its depth of discharge, how many times the battery can be drained, and how much power can be used. Lead-acid batteries degrade more with every cycle. Where a lithium battery may come with a 10,000-cycle guarantee. Lead-acid batteries are lower in cost for the same voltage and capacity but do not last for many cycles whereas, for lithium-ion batteries with higher discharge cycles, the initial cost is low. Despite having higher upfront costs, lithium-ion batteries are usually more valuable than lead-acid options. lead-acid batteries may be the better decision is in a scenario with an off-grid solar installation that isn’t used very frequently due to lower usage rates a lead-acid battery would be a good solution instead of lithium-ion batteries.

    Solar Charge Controller

    It regulates the charging of batteries and prevents them from over-charging and further damage. Simple charge controllers stop charging a battery when they exceed a set high voltage level and re-enable charging when battery voltage drops back below that level. Charge controllers may also monitor battery temperature to prevent overheating. Some charge controller systems also display data, transmit data to remote displays over time.

    The most common DC-coupled systems use solar charge controllers (also known as solar regulators) to charge a battery directly from solar, plus a battery inverter to supply AC power to the household appliances. For microsystems, such as those used in caravans/boats or huts, the simple PWM (Pulse Width Modulation) type solar controllers are a very low-cost way to connect 1 or 2 solar panels to charge a 12-volt battery. For larger systems, MPPT (Maximum Power Point Tracking) solar charge controllers are used. Unlike the simple PWM controllers, MPPT systems can operate at much higher string voltages.

    Off-Grid Solar Inverters

    Grid-tied inverters are simpler and easier to wire since there are usually only two main components but an off-grid inverter needs a battery bank to function. In the case of an off-grid system, the solar panels feed DC power to the batteries. Then the inverter takes that power and converts it into AC power for your home. This works essentially like a miniature power grid. One main difference between off-grid solar inverts and on-grid is they don’t have to match the frequency of the utility power grid compared to a grid-tied inverter.

    Hybrid inverters

    A hybrid inverter, otherwise known as a battery-based inverter, combines two separate components–a solar inverter and a battery inverter–into a single piece of equipment. it can function as both an inverter for electricity from your solar panels and a solar battery. One of the biggest benefits of a hybrid inverter is that it combines the functionality of two separate pieces of equipment into one. This can mean an easier installation process for your solar installer. Other than this a hybrid inverter allows for centralized monitoring of both battery and solar panels.

    AC and DC Disconnects

    The purpose of these disconnects is to make sure you can shut off incoming power from the solar panels. DC disconnects are places between solar panels and inverters. AC disconnects are placed after the inverter.

    AC disconnects are typically mounted on the exterior wall of the customer’s home near the electric meter. The necessity of these disconnects arises from the fact that in case of an emergency like fire or extreme weather conditions to protect the installations from getting damaged and even during maintenance, it is required to shut off the power completely for safety purposes. AC/DC disconnects are just one piece of the BOS (balance of system) components you’ll need for a successful solar installation.

    Off-grid systems are more complicated, thanks to additional components like the charge controller, battery monitor, and additional AC and DC circuit breakers. All of these things tend to make off-grid systems more difficult to wire and install.

    k Watts On Grid Solar PV System

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    Definition: On-Grid Systems are solar pv systems that only generate power when the utility power grid is available. They must connect to the grid to function. They can send excess power generated back to the grid when you are overproducing so you credit it for later use.

    Benefits: These are are simplest systems and the most cost effective to install. These systems will pay for themselves by offsetting utility bills in 3-8 years.

    Downside: These do not provide power during a grid outage.

    Conclusion: They are simple enough that you can install it yourself in a weekend with a friend. They are cost effective enough to pay for themselves and put money in your long term. If you want to reduce your electric bill and your carbon footprint this is a good choice.

    Wholesale Solar has pre-designed On-grid home solar packages with FGET panels.

    5k Watts On Grid Solar Po wer System Datasheet

    Solar Panel 20 Pieces Type: Monocrystalline Silicon PV Module
    Max Power: 250W
    Vmp: 30.5V; Imp: 8.33A
    Size: 164099035 mm
    Weight: 22kg/pcs
    25 years power output guarantee
    On Grid Inverter 1 Set DC600V input, AC220V/110V 1-phase output 50/60Hz;
    Rated Output Capacity:5kw
    Protections: Short circuit, overload, surge current, over temperature, over/under voltage, lightning, reverse polarity.
    High Voltage Combiners 1 Piece High Voltage Combiners
    Long service life
    WM4 C plug-in connector
    Solar Panel Rack 1Set Roof type mounting rack including complete fittings, aluminum alloy (Rack can be customized per request)
    Cables and Accessories 1Set International standard, with specification suitable for solar system, BV14 series and 110 series

    Samples and OEM, Warranty and After-Sale Service:

    Sample can be provided for quality testing

    • OEM Welcomed
    • Warranty:5 years for solar panel, 2 years for controller/inverter/battery.
    • After-Sale Service: 24 Hour-Hot Line for Consultancy and Technical Support

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    12V 200ah Deep Cycle VRLA Solar Storage Battery

    FGET deep-cycle battery is designed to discharge between 40% and 80% of its capacity, depending on the manufacturer and the construction of the battery.

    12V17ah Security Certified Storage Sealed Lead Acid Battery

    In normal UPS use, FGET use maintenance-free VRLA battery, whose design life is typically either five or ten years, with some fifteen-year sizes available.

    12V 150AH Deep Cycle VRLA Solar Storage Lead Acid Accumulator

    The FGET sealed lead acid rechargeable battery (VRLA battery) is leak-proof and maintenance free. The Superiority of VRLA battery is derived from its uniquely efficient oxygen recombination technology.

    12V 7AH Top Sales Sealed Lead Acid VRLA UPS Battery

    The FGET sealed lead acid rechargeable battery (VRLA battery) is leak-proof and maintenance free. The Superiority of VRLA battery is derived from its uniquely efficient oxygen recombination technology.

    50W Flexible ETFE Panel Portable Bag Mobile USB Charger

    High-efficiency Solar cells Fully adjustable 10A charge controller with LCD display and USB output Compatible with gel, AGM batteries and power bank Low-voltage system avoids electric shock hazards

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    On-grid vs off-grid solar

    While there are three different types of solar power systems (on-grid, off-grid and hybrid), all three work on the same basic principles.

    Solar energy or sunlight is first converted by the solar panels into direct current (DC) power, using what is known as the photovoltaic (PV) effect.

    This DC power can then either be stored in a battery, or converted by a solar inverter into alternate current (AC) power, which can then be used to run your household appliances.

    Depending on the type of solar power system being used, excess solar energy can also be fed back into your public electricity grid providing you with credits on your energy account as well as your reduced electricity costs.

    In this article, we are going to look at the differences, advantages, and disadvantages of two of the main types of solar power systems currently used Australia-wide:

    • On-grid solar: also known as a ‘grid-feed’ or ‘grid-tie’ solar system
    • Off-grid solar: also known as a ‘stand-alone power system’ (SAPS)

    On-grid vs off-grid solar: what is the key difference?

    The difference between the two solar systems is the ability to store and use excess power that’s been generated by the system.

    On-grid solar systems

    On-grid is by far the most common and widely used solar systems for homes and business in Australia.

    These systems use common solar inverters, are generally placed on top of the roof

    But, the main appeal to most people of on-grid solar systems is that they are tied to your local utility’s GRID.

    This means that any excess solar power that you generate is exported back into your local electricity grid, allowing you to get paid a ‘feed-in-tariff’ (FiT) or build credits that you can cash out at the end of the year in a process called ‘net metering.

    This on-grid system is what most residential homes will use, as you are covered if your solar system either under or over-produces. Basically, your electric utility company acts as your battery space.

    Advantages of on-grid systems

    • You do not have to buy an expensive battery back-up system to store any excess energy, this utility is a 100% efficient battery in itself
    • You will not need to implement any change to your lifestyle or means of conserving electricity
    • You will love receiving your credits from your local electricity grid provider for any unused energy that you have generated (on top of already reduced electricity bills!)

    Disadvantages of on-grid systems

    • On-grid solar systems are battery-less and therefore not able to function or generate electricity during a blackout, due to safety reasons. As blackouts usually occur when the electricity grid is damaged – if the solar inverter was still feeding electricity into a damaged grid it would risk the safety of the people repairing the fault/s in the network.
    • They can’t produce solar energy and reduce your power bill at night-time or when there’s no sunlight.
    • They provide you with less incentive to conserve energy!

    Off-grid solar systems

    Off-grid solar systems are not connected to the local electricity grid, and therefore require their own source of battery storage solution, as well as the solar panels and the inverter.

    Power that’s generated by the system is used to power the home and appliances, with any leftover power stored in batteries to use of an evening or on a rainy day.

    Off-grid systems are often needed in remote areas that are too far away from the local electricity grid, and therefore must be designed to ensure that they will generate enough power throughout the year and have enough battery capacity to meet the requirements of the premises – even in Winter when there is less sunlight.

    The additional cost of batteries means that off-grid systems are more expensive than on-grid systems.

    However, battery costs are now reducing rapidly which means there is growing enthusiasm for off-grid systems in cities and towns.

    Advantages of off-grid solar systems

    • If on an off-grid system, you are 100% self-sustaining your energy use as you are not connected in any way to your local grid’s power system or utility company
    • The cost of your energy is predictable, as you can amortize the cost of purchase and installation over the lifetime of the system. A good warranty can mean that without unexpected future costs, the return on investment can be calculated. When you compare this to the often high and fluctuating commercial energy costs, it is an attractive proposition.
    • These systems are good in terms of expandability as your energy needs change over time
    • They help prompt you to make efficient use of your electricity, which is good for the environment

    Disadvantages of off-grid systems

    • Off-grid systems require you to purchase a backup battery which can be bulky and expensive
    • Solar battery systems require regular maintenance
    • Off-grid options don’t feature the feed-in-tariff as the system is not connected to the grid in any way

    So, on-grid vs off-frid: which one is better for me?

    If you are located in an area where you are too far to connect to the local electricity supply, or where power supply isn’t reliable, then an off-grid solar system is clearly the best choice available for you.

    In most other cases, an on-grid solar system is generally suggested, on the key grounds of both cost-efficiency and reliability.

    Especially for residential houses, on-grid solar systems are appealing in that they do not require bulky and costly battery storage solutions, and you will also need fewer solar panels than you would if you were on an off-grid system – due to no need for producing extra power when there is no sunlight.

    If you are concerned about future electricity price hikes but don’t want to invest in a battery yet, then a ‘battery-ready’ option which is an on-grid system that can easily be connected to a battery later, may be best for you.

    For more advice and information on on-grid vs off-grid solar systems, please contact our friendly sales team today on (02) 4464 1597.

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