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  1. RV Solar Panels
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  9. Lithium - liFePO4
OptiMate Solar Duo Solar Charging System with Controller - 20 Watt Solar Panel

OptiMate Solar Duo Solar Charging System with Controller - 20 Watt Solar Panel

Item # MA79JR
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Our Price: $142.95
RV Solar Panels
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Shipping Weight: 5 lbs
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Product Expert Kathleen M

Is this right For you? Product Expert Kathleen M says:

Yes, if you:

  • Have a limited budget for solar panels

No, if you:

  • Camp in arid regions with lots of dust or in the mountains where sudden showers are common
  • Want the most efficient panels for the space - polycrystalline works just like mono- but at slightly less efficiency
This permanent mount solar charging system lets you mount the solar panel where you need it for maximum sunlight. 20-watt panel provides DC power to charge your vehicle's batteries. Charges lead-acid and lithium batteries. Lowest Prices for the best rv solar panels from OptiMate. OptiMate Solar Duo Solar Charging System with Controller - 20 Watt Solar Panel part number MA79JR can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (1)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

OptiMate RV Solar Panels - MA79JR

  • Roof Mounted Solar Kit
  • 20 Watts
  • OptiMate
  • Rigid Panels
  • Gel
  • AGM
  • Flooded Lead Acid
  • Lithium - liFePO4
  • 17-7/8L x 14-5/16W Inch
  • 0.1 - 5 amps
  • 1 Panel

This permanent mount solar charging system lets you mount the solar panel where you need it for maximum sunlight. 20-watt panel provides DC power to charge your vehicle's batteries. Charges lead-acid and lithium batteries.


  • Permanent mount solar system provides an energy saving charging solution for lead-acid and lithium batteries
    • Attach solar panel with included corner mounting brackets (hardware not included)
  • 20-Watt polycrystalline solar panel uses sunlight to charge your vehicle's batteries
    • Made from weatherproof materials to stand up to the elements
  • Solar controller adjusts solar panel output for a quick, consistent charge
    • Automatic multistage smart charging system helps extend battery life
    • LED display provides charge progress and monitors charge level throughout the night
  • Dual method smart charging system helps efficiently charge the battery in any weather
    • Provides continuous charge in full sun and a pulse charge in low light
    • Saves your dead battery from as low as 4V
  • Kit includes single solar panel with built-in solar cable, Solar Duo controller with SAE connector, battery clamps, and ring terminals


  • Application: 12V batteries from 2 to 240 amp-hours
  • Battery types supported: flooded, AGM, gel, and LiFePO4 (lithium-iron phosphate) batteries
  • Solar panel rated power: 20 watts
  • Solar panel voltage: 12V
  • Controller charging amperage:
    • Maximum average current: 1.67 amps
    • Pulse current: 3 to 5 amps
  • Controller input voltage: 15 - 22V
  • Solar panel IP rating: IP54
  • Cable lengths:
    • Solar cable: 80"
    • Controller cable: 40"
    • Battery clamp lead: 20"
    • Ring terminal lead: 20"
  • Panel dimensions: 17-7/8" long x 14-5/16" wide x 1" deep
  • 3-year limited warranty

TM522-D2 OptiMate Solar DUO + 20W Solar Panel 6-Step 12V / 12.8V 1.67A Sealed Solar Battery Saving Charger and Maintainer

Installation Details MA79JR Installation instructions

Video of OptiMate Solar Duo Solar Charging System with Controller - 20 Watt Solar Panel

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of OptiMate RV Solar Panels - Roof Mounted 20 Watt Solar Kit - MA79JR

Hi there, I'm Michael with Today, we're gonna take a quick look at this OptiMate Solar Duo Solar Charging System. This system is going to include this 20 watt, polycrystalline solar panel that uses sunlight to provide an off-grid charging solution for your lead acid and lithium batteries. This will permanently attach to your RV or trailer or whatever it is that you're wanting to get charged up with the corner mounting brackets here. The hardware to get this installed is not included, but you should be able to just use a few screws to get this held down in place. This way you can park with the solar panel in the general direction of the sun, that's gonna help charge up your battery.

This is made with weatherproof materials that will stand up to the elements. It's got a IP rating of 54, so it will do a good job of holding up to a lots of water and dust and that sort of thing. This will work for your 12 volt batteries from 2 to 240 amp-hours, whether they're Flooded, AGM, Gel or Lithium Iron Phosphate batteries. This is gonna do a good job of helping to charge those up. As far as our dimensions go, this is right at 17 and 7/8 of an inch tall by approximately 14 and a quarter of an inch wide.

And only about 1 inch deep. The panel will connect using the SAE connection here. This is going to plug right into your solar controller. Your controller is going to adjust your solar panel output for a quick, consistent charge. It's going to automatically have, charge your system using a multi-stage charging system that will allow your battery to have an extended life.

You can see it does have an LED display here. It's gonna provide the charging progress and monitors your charging level throughout the night. And the controller input voltage is capable of 15 to 22 volts. So it is gonna do a good job for you. The duo methods smart charging system helps to efficiently charge the battery in any weather.

So not just in the bright sunlight, but it's also going to provide a pulse charge of 3 to 5 amps in low light as well. So it's gonna help to protect your battery. It's gonna even help save your dead batteries from as low as 4 volts. And so this will then plug into your solar panel and then that will plug into your connection with the SAE fitting there. So you've got 2 different ways of connecting to your battery. You've got these alligator clamps for more of a temporary connection. So you can just hook those up to your posts. If you want a temporary connection, or you've got these ring terminals here. And if you want to have a more permanent connection, get those attached to your posts. And then this can just stay attached to that battery and plug in whenever you get where you're going, get set up in the sunlight. You can see it's got holes there, slot for zip ties to hold this in place and a fuse there, 15 amp fuse to help protect from any electrical issues. So overall, a really nice option, gives you a couple of different ways, a permanent or more of a temporary option, to get everything plugged in. All right, your cable length from your solar panel here. It's about 80 inches. Your charge controllers, about 40 inches, and then both your ring terminals and your battery clamps are both 20 inches. So it should give you a decent amount of length to reach out to your battery from where you have this mounted. So overall impressions, polycarbonate or the polypropylene, polycrystalline construction is decent. It's definitely not the high end of the materials for making solar panels. Your monocrystalline is more premium kind of product. It's just a little bit more efficient than the polycrystalline. So keep that in mind, if you are looking for the most premium product, we do have other options available for you, but if you're just looking for something that's gonna do a decent job with helping to trickle charge your battery when you're off grid, I think this is gonna be a great option for you. With this being the size that it is. I'm kind of surprised that it's not more portable. We do have lots of portable options available here at, but the benefit of a portable solar panel is that you can move it to where the sun is shining. So you don't have to be parked in the sun, getting hot yourself. You can just leave the panel out in the open where the sun's gonna hit it. But with this, it is designed to be permanently installed. So you would have to park where the sun is. So something to keep in mind there. It is pretty lightweight. So you could in theory, use it as a portable option, but there are others that are more designed for that with kick stands and that sort of thing to help keep them angled up to receive the sun. But overall, if you're just looking for a basic option to help trickle charge your battery, I think this will be a good job for you. So that's gonna complete our look for today. Again, I'm Michael with Thanks for watching..

Customer Reviews

OptiMate Solar Duo Solar Charging System with Controller - 20 Watt Solar Panel - MA79JR

Average Customer Rating:  5.0 out of 5 stars   (1 Customer Reviews)

This permanent mount solar charging system lets you mount the solar panel where you need it for maximum sunlight. 20-watt panel provides DC power to charge your vehicle's batteries. Charges lead-acid and lithium batteries.

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Info for this part was:

Employee Kathleen M
Updated by:
Kathleen M
Employee Dustin K
Video by:
Dustin K
Employee Daron K
Edited by:
Daron K
Employee David F
Installed by:
David F
Employee Michael B
Installed by:
Michael B
Employee Alex H
Written by:
Alex H

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