A Solar Regulator PWM
The REDARC 10A Solar Regulator ensures the correct charge is supplied safely and efficiently to charge an auxiliary battery.
- Multi-stage charging- boost, absorption, and float
- Works with multiple battery types (REDARC Solar Remote Monitor required)
- Ideal for permanent installation or portable systems
- Multiple levels of protection – over temperature, over charge, reverse polarity
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Amp Solar Regulator
The REDARC 30A Solar Regulator ensures the correct charge is supplied safely and efficiently to charge an auxiliary battery and is ideal when multiple REDARC solar blankets are used simultaneously. Available with Anderson™ SB™50 connectors.
REDARC’S newly designed 30 Amp Solar Regulator comes with the Anderson™ SB™50 connectors and is ideal for use when multiple REDARC solar blankets are used simultaneously. REDARC’s 30 Amp Solar Regulator acts as the go between to transfer power generated from the panels to the battery.
Featuring multistage charging; boost, absorption and float, REDARC’s 30 Amp Solar Regulator ensures that the correct charge is supplied safely and efficiently to the battery and will protect it from over charging.
It will work with multiple chemistry batteries including AGM, Standard and Calcium, is ideal for permanent installation or portable systems, and has multiple levels of protection including over temperature, over charge and reverse polarity.

What’s more set up is now even easier thanks to genuine industry standard Anderson™ SB™50 connectors. These high quality Anderson™ plugs are simple and fast to connect with no screw terminals and no risk of poor connections from frayed wires or loose terminals – just plug and play!
Battery default setting is AGM. REDARC recommends the purchase of the REDARC Solar Remote Monitor to change battery types and configuration settings.
Features
- Multi-stage charging- boost, absorption, and float
- Works with multiple battery types (REDARC Solar Remote Monitor required)
- Ideal for permanent installation or portable systems
- Multiple levels of protection – over temperature, over charge, reverse polarity
- Genuine Industry Standard Anderson™ SB™50 plug connection
9338628004188 |
REDARC |
360/7520W |
−31°F to 131°F |
1.2 lb (550 g) |
1.1 (28 mm) |
6 (153 mm) |
4.25 (108 mm) |
Anderson™ SB™ 50 |
12V / 24V |
30A |
REDARC offers customers free freight on orders within the contiguous US states on all orders placed over 100 via the REDARC website. Alaska, Hawaii, Canada and Mexico have low fixed freight rates. All products have a 5 day lead time before shipment after which it will be shipped via our preferred shipping method.
Please note that your order will require a signature on delivery. Please monitor your tracking details to ensure you are present at your delivery address when your order is delivered.
Orders will be shipped from our distribution center in North Carolina, USA with delivery timeframes dependant on location.
Customers can contact REDARC at power@redarcelectronics.com for additional freight options and pricing. The REDARC site can only be used to ship orders to the US contiguous states, as well as orders to Alaska, Hawaii, Canada and Mexico.
The terms and conditions relating to ‘Return of goods’ set out in our Trading Terms will apply to all good purchased by you via the site. All goods purchased by you via the site also come with a manufacturer’s warranty found here.
A 100% Australian-owned company, we have met the needs of customers in transport and other industries through exciting, innovative thinking. We believe in total customer satisfaction and practice this by offering our customers:
Technical advice free of jargon and free of charge
Prompt turnaround of orders
Friendly, personalized, professional service and product support In the unlikely event that a technical issue arises with a REDARC product, customers are encouraged to initially contact the REDARC Technical Support Team.
Choosing the Right Solar Charge Controller/Regulator
A solar charge controller (frequently called a regulator) is similar to a regular battery charger, i.e. it regulates the current flowing from the solar panel into the battery bank to avoid overcharging the batteries. (If you don’t need to understand the why’s, scroll to the end for a simple flow chart). As with a regular quality battery charger, various battery types are accommodated, the absorption voltage, float voltage can be selectable, and sometimes the time periods and/or the tail current are also selectable. They are especially suited for lithium-iron-phosphate batteries as once fully charged the controller then stays at the set float or holding voltage of around 13.6V (3.4V per cell) for the remainder of the day.

The most common charge profile is the same basic sequence used on a quality mains charger, i.e. bulk mode absorption mode float mode. Entry into bulk charge mode occurs at:
- sunrise in the morning
- if the battery voltage drops below a defined voltage for more than a set time period, e.g. 5 seconds (re-entry)
This re-entry into bulk mode works well with lead-acid batteries as the voltage drop and droop is worse than it is for lithium-based batteries which maintain a higher more stable voltage throughout the majority of the discharge cycle.
Lithium batteries
Lithium batteries (LiFePO4) do not benefit from re-entry into a bulk mode during the day as the internal impedance of the lithium batteries increases at high (and low) states of charge as indicated by the orange vertical lines in the chart below and it is only necessary to occasionally balance the cells which can only be done around the absorption voltage. A related reason is to avoid the Rapid and large variation in voltage that will occur in these regions as large loads are switched on and off.
Lithium batteries do not have a defined “float voltage”, and therefore the “float voltage” of the controller should be set to be at or just below the “charge knee voltage” (as indicated in the chart below) of the LiFePO4 charge profile, i.e. 3.4V per cell or 13.6V for a 12V battery. The controller should hold this voltage for the remainder of the day after bulk charging the battery.
The Difference Between PWM and MPPT Solar Charge Controllers
The crux of the difference is:
- With a PWM controller, the current is drawn out of the panel at just above the battery voltage, whereas
- With an MPPT solar charge controller the current is drawn out of the panel at the panel “maximum power voltage” (think of an MPPT controller as being a “Smart DC-DC converter”)
You often see slogans such as “you will get 20% or more energy harvesting from an MPPT controller”. This extra actually varies significantly and the following is a comparison assuming the panel is in full sun and the controller is in bulk charge mode. Ignoring voltage drops and using a simple panel and simple math as an example:
Battery voltage = 13V (battery voltage can vary between say 10.8V fully discharged and 14.4V during absorption charge mode). At 13V the panel amps will be slightly higher than the maximum power amps, say 5.2A
With a PWM controller, the power drawn from the panel is 5.2A 13V = 67.6 watts. This amount of power will be drawn regardless of the temperature of the panel, provided that the panel voltage remains above the battery voltage.
With an MPPT controller the power from the panel is 5.0A 18V = 90 watts, i.e. 25% higher. However this is overly optimistic as the voltage drops as temperature increases; so assuming the panel temperature rises to say 30°C above the standard test conditions (STC) temperature of 25°C and the voltage drops by 4% for every 10°C, i.e. total of 12% then the power drawn by the MPPT will be 5A 15.84V = 79.2W i.e. 17.2% more power than the PWM controller.
In summary, there is an increase in energy harvesting with the MPPT controllers, but the percentage increase in harvesting varies significantly over the course of a day.
PWM:
A PWM (pulse width modulation) controller can be thought of as an (electronic) switch between the solar panels and the battery:
- The switch is ON when the charger mode is in bulk charge mode
- The switch is “flicked” ON and OFF as needed (pulse width modulated) to hold the battery voltage at the absorption voltage
- The switch is OFF at the end of absorption while the battery voltage drops to the float voltage
- The switch is once again “flicked” ON and OFF as needed (pulse width modulated) to hold the battery voltage at the float voltage
Note that when the switch is OFF the panel voltage will be at the open-circuit voltage (Voc) and when the switch is ON the panel voltage will be at the battery voltage voltage drops between the panel and the controller.
The best panel match for a PWM controller:
The best panel match for a PWM controller is a panel with a voltage that is just sufficiently above that required for charging the battery and taking temperature into account, typically, a panel with a Vmp (maximum power voltage) of around 18V to charge a 12V battery. These are frequently referred to as a 12V panel even though they have a Vmp of around 18V.
MPPT:
The MPPT controller could be considered to be a “Smart DC-DC converter”, i.e. it drops the panel voltage (hence “house panels” could be used) down to the voltage required to charge the battery. The current is increased in the same ratio as the voltage is dropped (ignoring heating losses in the electronics), just like a conventional step-down DC-DC converter.
The “Smart” element in the DC-DC converter is the monitoring of the maximum power point of the panel which will vary during the day with the sun strength and angle, panel temperature, shading, and panel(s) health. The “smarts” then adjust the input voltage of the DC-DC converter – in “engineering speak” it provides a matched load to the panel.
The best panel match for an MPPT controller:
- The panel open circuit voltage (Voc) must be under the permitted voltage.
- The VOC must be above the “start voltage” for the controller to “kick in”
- The maximum panel short circuit current (Isc) must be within the range specified
- The maximum array wattage. some controllers allow this to be “over-sized”, e.g the Redarc Manager 30 is permitted to have up to 520W attached
Choosing the Right Solar Controller/Regulator
The PWM is a Good Low-Cost Option:
f or solar panels with a maximum power voltage (Vmp) of up to 18V for charging a 12V battery (36V for 24V battery, etc).
When the solar array voltage is substantially higher than the battery voltage e.g. using house panels, for charging 12V batteries
An MPPT controller will yield higher returns compared with a PWM controller as the panel voltage increases. I.e. a 160W panel using 36 conventional monocrystalline cells with a maximum power amp of 8.4A will provide around 8.6A at 12V; while the 180W panel having 4 more cells will provide the same amperage but 4 additional cells increases the panel voltage by 2V. A PWM controller will not harvest any additional energy, but an MPPT controller will harvest an additional 11.1% (4 / 36) from the 180W panel.
For the same principle, all panels using SunPower cells with more than 32 cells require an MPPT charge controller otherwise a PWM controller will harvest the same energy from 36, 40, 44 cell panels as it does from a 32 cell panel.
Solar Charge Controller Features and Options
Boost MPPT Controllers
“Boost” MPPT charge controllers allow batteries to be charged that has a higher voltage than the panel.
Combined MPPT and DC-DC Chargers
The MPPT function is a natural adjunct to the DC-DC charger function and there are several quality brands that provide this with more under development. A single unit can be used by itself, as it automatically switches between alternator charging and solar charging. For larger systems, our favoured arrangement is to use a separate MPPT controller for the fixed roof-mounted panels and use the combined MPPT/DC-DC with portable panels. In this case, an Anderson connector is placed on the exterior of an RV which is then wired to the solar input of the MPPT/DC-DC unit.
Note that the battery capacity must be sufficient so that the combined charging current from simultaneous charging from the alternator and the roof solar panels does not exceed the manufacturer’s recommended maximum charging current.
Cheaper Options
Cheap controllers may be marked as an MPPT but testing has shown that some are in fact PWM controllers. Cheap controllers may not have the over-voltage battery protection which could result in the battery being overcharged with potential damage to the battery; caution is recommended. Normally, due to the increased circuitry, MPPT solar charge controllers will be physically larger than PWM solar charge controllers.
Multiple Solar Chargers
Properly wired, it is possible to add multiple solar chargers (any combination of type and rating) to charge a battery. Proper wiring means that each solar charger is wired separately and directly to the battery terminals. This ideal case means that each controller will “see” the battery voltage and is unaffected by the current flow coming from other charge controllers. This situation is no different from charging a battery from the grid/generator at the same time as charging from solar. With modern controllers, the current will not flow backwards from the battery to the controller (excepting a very small quiescent current).
REDARC Solar-Ready DC-DC Chargers
large capacity battery banks may require a few cycles to fully charge.
Charges your auxiliary battery on the go with DC (alternator) and solar.
Keeps your fridge running and your food and beers cold.
Works with all battery types, including lithium.
Install anywhere: heat, water, dust and vibration proof.
Suitable for both 12v or 24v vehicles.
Overcomes voltage drop caused by long cable runs.
IN-VEHICLE DUAL BATTERY CHARGERS
Whether you’re overlanding, taking the kids on a trip in the RV, or just want to keep your vehicle’s battery fully charged, you can’t go past a DC to DC charger. Designed to withstand the harshest conditions, you can rely on a dual battery system from REDARC. Dual input battery chargers are solar ready and suitable for battery types including lithium, AGM, GEL, standard lead acid and calcium.
It’s time to take charge and pull the plug with REDARC’s DC to DC battery chargers. Many people across the country rely on auxiliary batteries for power when they’re away from home. RV owners aren’t always able to ‘hookup’ to convenient AC power and 4×4 enthusiasts like to take along some home comforts when camping.
Then there are the millions of people who rely on secondary batteries for their jobs in order to power their equipment such as dump trucks, food vans or to charge power tools.
But dump trucks don’t dump and coffee and snacks don’t get heated if you don’t have a proper way to charge your batteries. Luckily, REDARC has the solution with our state of the art DC to DC chargers.
In-vehicle dual battery chargers
REDARC offers the best in-vehicle dual battery charger range on the market. Ideal for anyone wishing to go off the grid, 24V and 12V battery chargers will ensure you have the battery power required to use 12 or 24 volt equipment when travelling.
Compact in size, REDARC’s SEMA award winning BCDC In-vehicle Dual Battery Chargers can be mounted in a variety of places for flexible installation options, from the engine bay to the inside or outside of a van or trailer. With features like fully-sealed electronics and fan-free cooling, water, dust and vibration are no match for these DC to DC chargers. For the ultimate set up, combine a REDARC DCDC charger with a REDARC battery management system.
Output Voltage | 12VDC |
Maximum Charging Voltage | 15.3V |
Output Current Rating (Cont.) | 25A |
Input Current (Max.) | 9 – 32VDC |
Output Power | 375W |
Input Fuse Rating | 40A |
Output Fuse Rating | 40A |
Length (in) | 6.50 |
Width (in) | 4.72 |
Height (in) | 1.46 |
Warranty | 2 Years |
Weight (lb) | 2.3 |
Standby Current Draw |
Whoa Free shipping!
We offer free shipping the continental US for order over 99! This obviously excludes super heavy and freight items.
Regular orders
All Items will be shipped as the customer chooses at checkout, and a tracking number will be provided. If there are special delivery instructions, please leave them in the notes.
All items will be properly padded and packed to minimize the risk of damage in transit. However, if a product does arrive damaged, it is up to the buyer to contact the shipper and file a claim, as all products are insured for the amount of purchase.
Freight orders
We do our best to calculate Freight costs at checkout, but to get the most accurate shipping costs we suggest reaching out to us in advance. Over phone or email so we can give you the spot on costs, get more delivery details and make arrangements easier.
Questions
We want you to be satisfied! By now we all know we cannot control shipping carriers and delays, but we truly do our best to get your orders as soon as possible. If you have any questions or need assistance place contact us.
Return policy
GTFO is happy to offer a 30-day refund from the purchase date. Any returned product must be in new condition, in original packaging, for full refund. If a product is defective, we will defer to the manufacturer’s warranty, and reach out to them on behalf of our customers. The warranty of any product purchased can be found in the product owner’s manual or online.
- Buyer must supply the original sales receipt.
- All returned products must be in new condition, and in original packaging
- It is the buyer’s responsibility to either bring or ship the product back to us at their cost before a refund is issued.
- We do not offer refunds on Gift cards.
- There are no refunds on sale items.
- There are no refunds on items purchased using discount codes
If the product purchased does not meet the needs of the customer, we will absolutely do our best to make it right for the customer. This may include an alternative product, or other means to create a positive experience for both the customer and ourselves.
OR just want a refund? No problem! As long as the above conditions are met, we will issue a refund. Please know that we have to charge a 3% fee on the transaction, to cover the charges that PayPal/Shopify/Mastercard charge us every time a transaction is made.
WARRANTY: For products that are being returned due to a warranty claim, GTFO will in some cases, replace the product out of dealer stock, and get credit from the manufacturer. However, in some cases, we will have to let the manufacturer of the product send a replacement.
REDARC SRPA0120 Solar Regulator Instruction Manual
Home » REDARC » REDARC SRPA0120 Solar Regulator Instruction Manual
REDARC SRPA0120 Solar Regulator
THE SOLAR REGULATOR
REDARC solar regulators ensure that the power supplied by your solar panels is at the right voltage to charge your lead acid house or auxiliary batteries. REDARC solar regulators are Pulse Width Modulated (PWM) controlled and incorporate automatic system voltage detection.REDARC solar regulators come in 10 A, 20 A and 30 A models which are capable of charging either 12 V or 24 V battery systems. The SRPA regulators are supplied factory set to the AGM battery type setting; A REDARC remote monitor (SRPA-RM) is required to change the battery type.
WARNING SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS — THIS MANUAL CONTAINS IMPORTANT SAFETY INSTRUCTIONS FOR REDARC SOLAR REGULATORS.DO NOT OPERATE THE SOLAR REGULATOR UNLESS YOU HAVE READ AND UNDERSTOOD THIS MANUAL AND THE SYSTEM IS SETUP AS PER THESE INSTRUCTIONS. REDARC RECOMMENDS THAT ANY REGULATOR/CHARGER BE INSTALLED BY A SUITABLY QUALIFIED PERSON.
RISK OF EXPLOSIVE GASES:WORKING IN THE VICINITY OF A LEAD-ACID BATTERY IS DANGEROUS. BATTERIES GENERATE EXPLOSIVE GASES DURING NORMAL OPERATION. FOR THIS REASON, IT IS OF UTMOST IMPORTANCE THAT YOU FOLLOW THE INSTRUCTIONS EACH TIME YOU USE THE REGULATOR.
- Solar Regulators should not be used by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they are supervised or have been instructed on how to use the appliance by a person responsible for their safety. Children should be supervised to ensure that they do not play with the Solar Regulator.
- Do NOT use the Solar Regulator to charge non-rechargeable batteries. Doing so may result in harm to the user and/or damage to the regulator and/or solar blanket. Only use the Solar Regulator for charging standard lead acid, calcium content, Gel AGM type 12 V and 24 V batteries.
- Over Charging Hazard. Failure to connect solar panel’s negative wire directly to the regulator may result in overcharging the battery. The solar panel’s negative wire must be connected directly to the regulator only.
- Check the battery manufacturer’s data for your battery and ensure that the voltage of the charging profile you select does not exceed the manufacturer’s recommended maximum charging voltage. If the absorption and boost voltage for your battery type is too high, please select another charging profile. The Solar Regulator is not intended to supply power to a low voltage electrical system other than to charge a battery.
- Electrical Hazard. Incorrect connection of batteries and solar panels in Parallel or Series can subject the regulator to high voltages that will damage the regulator. Ensure the recommended connections and sequences are followed and that the rated current, wattage and voltage of the regulator is not exceeded.
- NEVER smoke or allow a spark or flame in vicinity of battery or engine.This may cause the battery to explode.PERSONAL SAFETY PRECAUTIONS
- To assist with the safe operation and use of the Solar Regulator:a. Wear complete eye protection and clothing protection. Avoid touching eyes while working near a battery.b. If battery acid contacts your skin or clothing, remove the affected clothing and wash the affected area of your skin immediately with soap and water. If battery acid enters your eye, immediately flood the eye with running cold water for at least 10 minutes and seek medical assistance immediately.
The Solar Regulator will achieve best results when proper battery maintenance is regularly performed. This includes but is not limited to checking water and specific gravity levels of the battery.
THE SOLAR REGULATOR
Regulator FunctionThe SRPA regulators are supplied factory set to the AGM battery type setting; A REDARC remote monitor (SRPA-RM) is required to change the battery type.
Regulator Connection
- Connect to the battery first before the solar panel.
- Connect to the Battery and Solar Panel via an Anderson™ SB™ 50, 50 A grey connector.
- The REDARC Solar Regulator should be installed as close as possible to the battery it is charging.
- Refer to the Installation notes in section 3.1 (on page 9) and System Wiring (page 11).
- Caution: Incorrect connection of the battery or solar panel can damage the regulator, please confirm all wiring polarity before connection is made.

SYSTEM SETUP
- If using more than one panel, ensure that all panels are situated near each other and are exposed to similar lighting conditions. Failure to do this may cause damage to the panels.
- If using multiple panels, it is highly recommended to ensure that they are identical.
OVERCHARGING HAZARD. FAILURE TO CONNECT SOLAR PANEL’S NEGATIVE WIRE DIRECTLY TO THE REGULATOR MAY RESULT IN OVERCHARGING THE BATTERY. THE SOLAR PANEL’S NEGATIVE WIRE MUST BE CONNECTED DIRECT TO THE REGULATOR ONLY.
ELECTRICAL HAZARD. INCORRECT CONNECTION OF BATTERIES AND SOLAR PANELS IN PARALLEL OR SERIES CAN SUBJECT THE REGULATOR TO HIGH VOLTAGES THAT WILL DAMAGE THE REGULATOR. ENSURE THE RECOMMENDED CONNECTIONS AND SEQUENCES ARE FOLLOWED AND THAT THE RATED CURRENT AND/OR VOLTAGE OF THE REGULATOR IS NOT EXCEEDED.
Fuse ProtectionFuse protection is required for wire and component protection in case of short circuit. Fuses are to be fitted as close as possible to the battery positive terminal.REDARC recommends using MIDI-style bolt-down fuses as they ensure a low resistance connection. The REDARC FK40 and FK60 fuse kits are recommended.Blade type fuses are not recommended as they can result in high resistance connection which causes excess heat and may damage the fuse holder and/or the wiring. Self-resetting circuit breakers are not recommended as they may trip prematurely due to the heat generated by the current flowing through the wires.
Specifications
Power Rating120 W (SRPA0120)
Charge profile voltages will vary with change in temperature, as per temperature compensation rates. ICES Declaration: CAN ICES-003 (B) / NMB-003(B)
FCC Statment
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
- This device may not cause harmful interference.
- This device must accept any interference received, including interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna
- Increase the separation between the equipment and receiver
- Connect the equipment intro an outlet on a circuit different from that to which the receiver is connected
- Consult the dealer or an experienced radio / TV technician for help
Changes or modifications not expressly approved by (the party responsible for compliance) could void the user’s authority to operate the equipment
- Always connect the battery/s first (before the panel).
- Always ensure the connection to the battery terminals is sound, with as much surface contact between the battery terminal and the connection method (e.g. Alligator clips) as possible.
- The regulator should be installed as close as possible to the battery/s.
- Ensure that any non-REDARC Anderson™ plug terminals are soldered correctly or crimped with the correct Anderson™ crimping tool.
- Always check the manufacturer’s data for your battery and ensure that the maximum voltage of the charging profile you select does not exceed the manufacturer’s recommended maximum charging voltage. If the ‘Maximum’ voltage for your battery type is too high, please select another charging profile. SRPA-RM will be required to change from default setting.
- Care should be taken to not expose the regulator to moisture.
- For optimum operation, the regulator should be mounted in an environment where the temperature is normally below 45°C / 113°F and does not exceed 55°C / 131°F.
- Battery clip SRC0009 is intended for a portable short term connection and should not to be left connected permanently.
Accessories
SRPA-RMThe SRPA-RM is an optional Remote Monitor for use with REDARC SRPA0120, SRPA0240 and SRPA0360 regulators.The SRPA-RM is required to change the charging profile on the Regulator. By Default SRPA0120, SRPA0240 and SRPA0360 Regulators are set to AGM.
REDARC Cable Range
SYSTEM WIRING
12 V Standard System
24 V Standard System
- Both panels used must be identical, mixing and matching may cause damage. The lowest rated current panel will dissipate heat if they are not matched.
- Both panels must be positioned next to each other at the same angle to receive identical illumination otherwise damage can be caused and/or batteries may not charge.
Wiring Multiple Panels in Parallel (12 V)
WARRANTY
Limited WarrantyFor full warranty terms and conditions, visit the link below or refer to the contact details applicable to your region.
Australia and New Zealandwww.redarc.com.au/warrantyREDARC Electronics Pty Ltd 23 Brodie Road (North), Lonsdale SA 5160Australia
North Americawww.redarcelectronics.com/warrantyREDARC Corporationc/o Shallco, Inc.308 Component Dr.Smithfield, NC 27577USAUSA 1 (704) 247 5150