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  1. RV Solar Panels
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  3. Roof Mounted Solar Kit
  4. 200 Watts
  5. AGM
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Go Power Overlander Solar Charging System with Digital Solar Controller - 400 Watt Solar Panels

Go Power Overlander Solar Charging System with Digital Solar Controller - 400 Watt Solar Panels

Item # GP39MR
Our Price: $1,051.96
RV Solar Panels
Shipping Weight: 71 lbs
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This solar charging system helps get you off the grid with a 400-watt solar panel that provides DC power to charge your RV's batteries. Solar controller regulates and monitors power output while preventing harmful overcharging. Great Prices for the best rv solar panels from Go Power. Go Power Overlander Solar Charging System with Digital Solar Controller - 400 Watt Solar Panels part number GP39MR can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (49)
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Go Power RV Solar Panels - GP39MR

  • Roof Mounted Solar Kit
  • 200 Watts
  • Go Power
  • AGM
  • Flooded Lead Acid
  • Gel
  • Lithium - liFePO4
  • 10.1 Amps or More
  • Rigid Panels
  • 2 Panels
  • 59-1/8L x 26-5/16W Inch

This solar charging system helps get you off the grid with a 400-watt solar panel that provides DC power to charge your RV's batteries. Solar controller regulates and monitors power output while preventing harmful overcharging.


  • Solar system provides an off-grid charging solution
  • (2) 200-Watt monocrystalline solar panels uses sunlight to charge your RV batteries
    • Provides a total of 400 watts of solar energy
    • Made from weatherproof and impact-resistant materials to stand up to the elements
  • 30-Amp PWM solar controller adjusts solar panel output for a quick, consistent charge
    • Automatic multistage smart charging system helps extend battery life
    • Digital display monitors amperage, voltage, and battery capacity
  • Kit includes 2 solar panels, solar controller, MC4 cables, MC4 branch connectors, and installation hardware
    • Inverter (sold separately) provides AC power to run appliances and electronics
    • Adjustable mount kit (sold separately) lets you angle the solar panel for maximum sunlight exposure


  • Application: 12V battery systems
  • Number of solar panels: 2
  • Solar controller input current: 30 amps
  • Solar controller dimensions: 6" wide x 3-7/8" tall x 1-3/8" deep
  • 25-Year limited warranty

go power solar diagram no cable entry plate

If you are an energy-conscious RV owner, the Go Power Overlander solar charging system provides clean, renewable power and independence from the grid. This kit comes with everything you need to charge your RV batteries with sunlight. Using 2 solar panels, this system collects solar energy to create DC power that passes through a solar controller to charge your RV batteries.

How It Works

Collecting Solar Power

go power solar panel

The charging process starts with the solar panels, which install on the roof of your RV. When solar energy interacts with the silicon cells in the panel, it generates a flow of DC electrical current that charges your RV's batteries. Each of the monocrystalline cells is made from a single crystal of silicon, so the electrons that create the current have more space to move, making this panel more efficient than one with polycrystalline cells. And in optimal sunlight conditions, the panel produces 400 watts per hour.

solar cells

The silicon cells are set between a cushioned backing material and tempered solar glass to withstand the elements. The glass has low-iron content to provide exceptional transparency, which ensures maximum sunlight collection. Finally, the panel is framed with anodized marine-grade aluminum to resist rust and corrosion.

go power adjustable arms

An adjustable mount kit (sold separately) can increase your solar panel performance by angling it for maximum sun exposure. This kit replaces the panel's existing brackets and allows it to tilt at 3 different angles. This also improves solar charging during winter months when the sun is lower in the sky.

Charging and Protecting RV Battery Bank

go power solar controller

The solar controller prevents harmful overcharging by adjusting the power generated by the solar panel before it reaches your batteries. It uses pulse width modulation technology to regulate the output through pulses that provide a consistent charge. Typically, this type of technology is a good fit for smaller systems with lower voltages.

Using a multistage charging system, the controller automatically switches voltages while the battery bank charges. This accelerates the charge, but also helps extend battery life by adjusting the voltage during the different modes. The controller is compatible with multiple battery types and includes preset charging profiles for sealed/gel, AGM, flooded/wet cell, and lithium batteries.

Charging Modes

  1. Bulk: This mode charges at the full rated load for a quicker recharge time. As the name suggests, this is where the bulk of the charging happens. It typically charges the battery to at least 80% capacity.
  2. Absorption : This mode provides controlled voltage to ensure a full charge. Once the battery reaches between 80% to 90% capacity, the absorption state will kick in and start charging at a regulated voltage. In each charging profile, this mode is set to last for 30 minutes after the bulk charge is completed.
  3. Float : Once the battery reaches full charge, this mode maintains a lower voltage to compensate for self-discharge. This reduces battery stress and minimizes gassing and water loss.
  4. Equalization : On flooded/wet cell batteries, this mode activates to prevent stratification and sulfate buildup during extended float cycles. These two issues can damage a battery by causing the accumulation of acid at the bottom of the battery and hardened sulfate crystals on the battery plates. This mode is especially helpful when your battery is going unused during storage.

With Maximum Power Boost Technology, you can simply press a button to activate Bulk mode for the highest charging voltage. This lets you quickly top off your battery bank before the end of the day by capturing as much power as possible.

solar controller terminals

This solar controller is built to charge two battery banks and has terminals for a primary and secondary battery. Your primary battery will receive the full current until it is completely charged. Then, your secondary battery will start to draw the charge current.

solar controller digital display

The backlit, digital display acts as an information center for your solar panel output. It shows the charging current, battery voltage, and battery state of charge. It also allows you to input your battery type and choose a charging profile. Additionally, a built-in USB port on the front of the controller provides a convenient outlet to charge your cell phone or tablet.

It includes a Bluetooth function that lets you connect the controller to your smartphone or tablet with the free Go Power! Connect app. With this app, you can wirelessly view the same live battery information included on the display. Also, you can control your battery profile and toggle Maximum Power Boost Technology mode.

Lastly, the controller includes several built-in safety features to help protect your equipment. The charging process will shut down if the controller starts to overheat and when an overcurrent is detected. Also, if the battery or solar panel is wired incorrectly, it activates a reverse polarity alarm.

How It Installs

overlander how it installs

The system includes 2 200-watt solar panels, a 30-amp PWM solar controller, MC4 cables, and all the necessary installation hardware.

  1. Solar Panels: The solar panels install anywhere on your RV roof with included mounting feet and hardware. To maximize sunlight collection, it is important to install the panel where it avoids shadows cast by objects, like an air conditioner or vent. The panel uses MC4 cables to connect to the solar controller. These cables can enter the RV through the refrigerator vent or using a Go Power cable entry plate (sold separately). The cable entry plate provides a covered housing and uses a quick connect setup for the MC4 cables.
  2. Solar Controller: The solar controller flush-mounts to a wall inside your RV. The manual includes a mounting template with measurements to ensure proper installation. It is wired to the solar panel using MC4 cables. Then, the battery bank is wired to the primary terminals on the controller. If you are using additional batteries, they can be connected to the secondary terminals. The included 30-amp fuse is installed between the solar controller and battery for additional current protection.

Note: This kit may require more wiring and additional parts depending on your RV setup.

Individual Component Specs:

Solar panel:

  • Rated power: 200 watts
  • Amperage: 9.3 amps
  • Voltage: 20.4V
  • IP rating: IP67
  • MC4 cable length: 25' each
  • Dimensions: 59-1/8" long x 26-5/16" wide x 1-1/2" deep
  • Weight: 26.4 lbs
  • 25-Year limited warranty

Solar controller:

  • Maximum input current: 30 amps
  • Maximum input voltage: 28V
  • Operating temperature range: -40 F to 185 F
  • Temperature compensation: -13 mV per F
  • Maximum wire gauge: #4 AWG
  • Dimensions: 7-1/2" wide x 4-1/4" long x 1-1/4" deep
  • Weight: 0.66 lbs
  • 5-Year warranty

76216 Go Power MC4 Output Cable with Male and Female Connectors - 10' Long

82845 Go Power Overlander Solar Charging System with Digital Solar Controller - 200 Watt Solar Panel

82182 Go Power Overlander Expansion Kit - 200 Watt Solar Panel

Installation Details GP39MR Installation instructionsAlternate Instructions GP39MR Installation instructions

Customer Satisfaction Score:

Customer Reviews

Go Power Overlander Solar Charging System with Digital Solar Controller - 400 Watt Solar Panels - GP39MR

Average Customer Rating:  4.6 out of 5 stars   (49 Customer Reviews)

This solar charging system helps get you off the grid with a 400-watt solar panel that provides DC power to charge your RV's batteries. Solar controller regulates and monitors power output while preventing harmful overcharging.


We're having the 2 solar panels installed next week.Not as easy on a old motercoach that's not pre-wried for solar - I'll post an update after they are in use!


I have two of these panels and the solar controller with 4ea 12v 100ah batteries on my houseboat. I power my 120v refrigerator, freezer, and ice maker. During the day there is enough Solar to power all of the devices. I run the generator an hour at night and the batteries stay above 12.4v overnight. As soon as it gets light outside, the panels start sending a charge. Within two hours of full daylight I am running purely on Solar again for the day. Very happy with my purchase.


I installed 2 100 watt panels they seem to be doing okay I average 13.4 watts of battery power, I have two marine batteries in series I have a residential refrigerator and 12 volt lites all working off solar when needed


Best thing I've added to the trailer. Its like keeping it plugged in all the time. Keeps my batteries charged and conditioned throughout the winter. Installation was easy as my trailer was prewired.


Super easy install. Simple instruction. Good beginner package for RV solar.


I have had the overlander solar package installed now for 6 months. My Jayco Greyhawk had the go power wires pre installed so the installation was very easy. My only regret was not buying two 190 watt panels. As for 4 star rating, did not have it long enough to justify 5 stars.

I have 2 deep cell lead acid batteries, the instructions are not very clear which to choose, sealed or flooded. Presently selected on flooded type and I think that maybe the controller is overcharging them, due to corrosion on the positive terminal.


The solar kit was exactly as represented in the description. The ability to watch a video of an installation was very helpful even though the installation was not that complicated in our case since our trailer was prewired for it. Be sure to order butyl tape and sealant to make sure the installation is waterproof. Answering questions and prompt delivery is a definite plus for working with etrailer.


The advice and assistance received from Jason and Alex was most helpful in installing a Go Power Overlander Solar system on our No Boundary trailer roof rack. Many thanks!


I love my Go Power Solar system. Before getting it my coach battery would drain down even though I had everything turned off. Now when I go to the storage yard ,even after a extended period of time, my coach and chassis batteries are at 100%. I recommend the Go Power Overlander Solar Charging System RV Solar Panel.


Solar is working as advertised.


Incompetent company couldn’t be bothered to package properly, accessory pack lost in transit, this resulted in over $xxx in having to buy another locally and pay my installed a second trip out to finish installing. BUYER BEWARE DO NOT OREDER FROM ETRAILER.


I love this kit and it is used to keep the coach battery charged and topped off. The panels are installed on the roof (second panel purchased). I also like the Bluetooth monitoring system that hooks to my cell phone. When I'm dry docking, it charges the battery back up after a night of running the Furnas (gas).


Quick shipping arrived in great condition haven't hooked it up to my RV yet but the instructions appear to be pretty straightforward.


Solar Panel works. Everything went well. etrailer is great. So why not 5 stars. The app that comes with the controller is junk. No other too say it. You need the app for some setting resets. I have spent more time on this, than 10 installations. The app actually caused me go with another brand solar panel for my portable one. I wish etrailer carried other brand options. I wrote this after 4 weeks of trying to this figured out, just to make sure I have tried everything I know.


Unit has been Awesome for keeping 2 GC2 batteries charged on travel trailer even in rainy/cloudy conditions.


Came in quickly and was not damaged like large boxes sometimes are.


Super setup. The instructions were very clear and it was relatively easy to install especially if your unit is pre-wired for the Go Power solar. The price was $[XXX] cheaper than the dealer quote for the setup and I save a couple hundred dollars in labor. etrailer gets my vote for excellent service and price.


I love "go power" the second unit that I have installed. It not only charges my house batteries but it also charges my coach battery. The system install is easy and straightforward enough. high quality workmanship and well-thought-out kit. Running the wires was the hard part!


The panel keeps us powered when we are boondocking. It also keeps the battery fully charged when we're home so we never have to check it.


Everything went well with the install. I do think that it should come with leveling sealant. Due to my travel trailer being pre-wired I had wire that I did not need and priced in with the kit. Thanks


We installed these solar panels on our 2017 Forest River Sunseeker in June 2019. We love them! We dry camp regularly and never worry about low batteries or running the generator. It is well worth the investment!


Speedy delivery of the item. Have not unpacked the product yet. Plan to use on trailer for extra power. Will install soon.


The solar panel was just as expected. The install was easy, (as soon as I figured out how to run the wires from the roof to the battery compartment). Take your time, and you don't need to install the control panel in your rig. I installed it in the battery compartment, then I installed the APP on my phone.


Great system, drilled some holes, mounted panel. Wired up to controller & hooked up to battery..boom. works like a champ..satisfied customer


Just as described, shipped fast, fair p rice.

Show More Reviews

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Info for this part was:

Employee Kathleen M
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Employee Steven C
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