SOLPERK Solar Panel Kit 30W 12V, Waterproof Solar Battery Trickle Charger Maintainer + Upgrade Waterproof Controller + Adjustable Mount Bracket for Boat Car RV Motorcycle Marine Automotive

I have the solar panel inside of a south facing window in my garage in order. I just set the panel on the window sill facing out at a slight up angle. When I connect to the 24 series deep cycle marine style Interstate battery I have the LED comes on immediately. When the sun is shining (and even if it's overcast) the 2nd LED comes on too. I have never seen the 3rd LED which is intended to signal "charged" but the manual claims it's looking for a pretty high voltage in order to consider the battery charged (like 14.2 or something like that). I'm a little concerned about it over-charging but so far I am very happy with the performance of the panel and keeping the battery charged. My eventual plan is to connect it to the battery in an ATV that eats battery like crazy. If I don't start and run the ATV at least once every two weeks the battery is dead. The ATV is in a small garage on my hunting property and I don't get there but maybe once a month. Most of the time the battery is dead when I arrive so I have to jump it almost every time. I believe this panel/charger will solve my problem. Will update if anything goes poorly!

Great product that harnessed the power of the sun and charged the dead battery in my RV engine compartment. Review is for the SOLPERK Solar Panel Kit 20W 12V, Solar Battery Trickle Charger Maintainer.The battery was dead, no dash lights, no engine crank dead and the entry step would not move. My 2 house batteries were also dead. After my last camp trip in February, I carelessly let the RV batteries drain and when I tried to start months later, all batteries were drained. 6 days later, I was able to start the engine and let it run because of the solar charger. It may have charged the batteries enough to start sooner but I initially did not have the charger placed in full sun so on day 3, I moved the solar panel to the front of the RV, and on day 6 I decided to go check for life and was thrilled to be able to start/run the engine. Love the ease of use as well as the length of the cables which allowed me to try different placements and it is priced really well. I would recommend the product.

Seems to be working good. My travel trailer is stored under a shed at a storage unit and it doesn’t have any electrical outlets here but it does have plenty of sunlight up at the front. The only issue I had and this just could have just been the one I got is that the polarity on the sae quick connect cable coming out of the controller to the battery seemed to be reversed. Red was neg, black was pos. It wouldn’t work with the cable I already had coming out for my old battery tender so I used the one that came with this and it worked fine. When I plugged it into the one I had already had, the black cable coming off the control lined up with the red cable I had coming from the positive side of the battery. It took me a few minutes before I realized what was going on and I was about to return it. I guess I could have just switched mine up at the battery but then the colors would have been backwards and confusing if that makes sense. Bottom line if it doesn’t work for you then try using the sae quick connect cable that came with it and you’ll be fine.

Fantastic! I mounted the panel outside, ran the wire inside to the controller which I plugged into a relatively new 12v AGM car battery. The panel charged the battery up the first day and keeps it topped-off enough for the battery's current load, which is currently a 12v automotive LED that I mounted pointing at the ceiling of the kitchen. Makes a great night light in there that can run all night, every night. The plan is to set up the whole house with night lights in strategic areas so as not to need to use grid power to get around the house at night. Also plan to make a simple photosensitive on/off circuit so the system will be 100% maintenance free if desired. Great panel! Highly recommend. I'll be getting another to hook up to my car to keep its battery charged also. GO SOLAR!!!

Haven't used the item yet, but wanted to let others know that the dimensions in the description are way off for the 50W version. The description says 8" x 10", but it's really 22.5" x 17.7".I'll update with how well it works once I have it installed.

I was skeptical when I made the purchase, Now.. I'm impressed. I played with it a bit connecting it to a new battery to top it off which it did in about 30min. Another battery 970cca that had been drained to 12.1v and it topped it off to 13.2v in about 2.75 hrs. The other day had it connected to a 12AH DS battery and we got snow. After accumulating about an inch of snow on the panel it was still charging, certainly at a reduced rate but charging. On a bright day I put the panel out of direct sunlight and it still topped off the battery after several hours. It definitely performs better than I would have expected. It seems the panel and charge controller it is packaged with are a good match.It is very easy to work with, basically plug and play. It is pretty compact and the indicators are simple and easy to read. A good buy in my opinion.

We recently purchased a shipping container, primarily to store lawn equipment in. A couple of the lawn equipment items have batteries, due to being electric starts. There was no electricity to the container, so I decided to buy a couple of these solar chargers to use in keeping the batteries charged. They work great, were easy to install and priced right.

I just revised my review based on the excellent customer service by the manufacturer. They need to improve their quality control, or reverse the polarity on all of their production but I was able to solve the problem and now the solar properly charges my engine AGM battery successfully.The few times that I hooked up this solar panel to charge my AGM starter battery, it ran down the voltage on my battery. Then I read some other negative reviews, and figured out that this unit was wired incorrectly. My prior solar panels worked AOK, so I put in an inline adapter reversing the polarity, and ALL NOW WORKS as advertised. A one star rating due to the poor factory build.