SUNER POWER 20W 12V Solar Battery Charger Maintainer, Built-in Smart MPPT Charge Controller, Adjustable Mount Bracket, Waterproof 20 Watt Solar Panel Kits for Car Automotive Boat Marine RV Trailer

works great

Put on tractor that hardly gets used. Battery is always hot and ready to go and it's an old battery.

Bought it mid November to keep my pickup charged while away for xmas. My previous one 10w sometimes struggled to keep my battery charged if weather inclement.I installed it checked it's output. All seemed good. Parked the pickup with the panel on the dash in Florida.Came back yesterday to a total flat battery. The battery was new (3 months). Checked the unit and it has no output. Very disappointed. Used once and it died, of course no warranty, its now 2 months old and used once.UPDATE!Due to pressure of work I did not contact the company or amazon to express my disappointment.HOWEVER, the company must check their reviews and contacted me out of the blue. After replying to their email concerning technical info etc. They have now sent me a new F.O.C. panel which I plugged in this morning and is now working fine. As far as I am concerned this is great service, and going beyond the call. I'm very impressed in them checking reviews to make sure their customers are happy and contacting me when they realized my disappointment immediately. Thank you Mason and the staff at Sunpower for solving the situation. Incredible aftersales service!

Panel works good but only came with half the mounting brackets

I mounted this solar panel on two short 2x4's, which I then screwed to a tree. Very sturdy design!

Purchased 2 for my Utility & Dump trailer 30W chargers, but have yet to install on my trailers. I've been using them on my lawn tractor, Zero turn and log splitter for about a month now to maintain the batteries and I'm pleased with how good they work. They are easy to move from one to another by just unplugging from one and re-plugging to another. Seems to charge well enough even on cloudy days. They are keeping my batteries at 13.4v to 13.6v. I've decided to purchased 50w chargers for my dump trailer because I want more charging capacity for the larger batteries because the batteries are discharged when in use.My only complaint is that it would be nice if the adjustable angle mechanism had a spring loaded de tent (like on a walking cane) instead of the bolts and wing nuts for angle adjustment. Also, would be nice to have a long and narrow panel to accommodate location under the header of my dump trailer. Wattage size of 50w to 100w with a length of about 5 foot and a width of about 12" to 16"

I purchased the 30W Solar Charger, out of the box the charger would not produce power, I checked both sets of leads, neither would work to detect the Battery, I hooked my fluke tester directly to the leads coupling with the panel facing directly into the sun and it was not producing any power (No voltage). All it will do is the SOR flashes Red to Green on the charge controller. I got online to try to contact the manufacturer, no phone number listed, (1st indication that you should not be doing business with them), so sent Emails to them, (crickets). I finally had to contact Amazon, then Suner Support got back to me, by this time I had to return to work, then they want videos of what it is doing. In short, I would have not given them 1 star, but I thought if I didn't my review would not get posted.

Easy to install does a good job keeping battery charged while using trolling motor great quality comes with two different ways to connect to battery.