SOLPERK Solar Panel Kit 50W 12V, Solar Battery Trickle Charger Maintainer with Upgrade Waterproof Controller for Boat Car RV Motorcycle Marine Automotive (Without Mounting Bracket)

A very nice neat clean high-quality product. It was simple easy to assemble and I’m using it on my tractor battery to keep it charged. It’s done an excellent job.

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.

Appears to work well for the last 4 years. Locking screws tend to drift on windy days but easy to correct. A sun tracking system would be a great addition.

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.

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!

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.

Works on car trailer battery to keep charged . From sitting to long for use this keeps the brake away battery charged and ready to go do work ! Easy to mount with little space taken and looks like the space age !!! People ask what it does , tell them Tesla recovery charger !!!

First off, I never intended to use just one of these panels to charge my 12V lead acid car battery with the included PWM charge controller and attached wiring harness. Rather, I intend to buy multiple examples of these panels and configure them with a more comprehensive MPPT controller, LiFePO4 battery and inverter in a carry-in-car and set-up-quickly portable application. The 23.1" (541mm) square footprint is ideal for the portability I need and the price is certainly right.Fortunately, the fit and finish of the panel itself is very good. This sort of thing would have easily cost twice as much just a few short years ago. There are a few rough edges on the corners of the aluminum framing, but that's a minor point. The individual cells look to be very cleanly assembled, topped with a nice piece of glass and the caulking sealant job along the interior of the frame is very clean.I knew from the Amazon listing, however, that the panel would come with a 6' long piece of spindly zip cord terminated with a 2-pin trailer connector. The good news is that the junction box termination on the back of the panel is of the conventional type with a water-proof seal. It's going to be relatively easy to solder in better cabling with standard MC-4 connectors.As it turns out, the attached cable (basically 14 gauge red/black lamp cord) had a short . . . zero voltage and amp readings on the multimeter at the connector end! Readings off the tabs inside the junction box (easy to pry off the back cover with a flat blade screwdriver) indicates, though, that the panel outputs 23.6V and 2.5A on my quickly-assembled back yard test rig (picture attached.) That's very good. I tested at Noon with reasonably perpendicular panel/Sun angling on a cloudless day. Ambient temperature was approximately 70° F / 21° CNext, I trimmed/stripped the 14 gauge wires to within about 1 foot of the junction box and got similarly good readings. Subsequently, I found out that the short was in the remaining (now detached) ~5 feet of cable somewhere along the black/negative wire. I did not test the included PWM charge controller.If it was just for the panel itself, I'd give the Solperk SK-M50W a solid 5 stars. I'm knocking it down to 4 stars because the wiring harness is terrible and, in my case, non-functioning out of the box. I will be buying more of these panels for my above-described application, knowing that the other included bits will be going into the waste can and I'll need to solder in suitable 10 gauge wires at the junction box end, terminated at the other end with real MC-4 connectors. The additional attached photo here shows the back of the panel (junction box cover removed) with labeling. In case the resolution of the photo isn't good enough to clearly see, the specifications shown on the label are as follows . . .Solperk Model: SK-M50W solar panelMaximum Power (Pmax) 50WMaximum Power Voltage (Vmp) 18VMaximum Power Current (Imp) 2.78AOpen Circuit Voltage (Voc) 21.6VShort Circuit Current (Isc) 3.06AMaximum System Voltage 600VDCNominal Operating Cell Temp. (NOCT) 45+/-2°CPower Tolerance +/-5%Application Class Class AWeight 7.2lbsDimensions 21.3 x 21.3 x 1 inchAll technical data at Standard Test Condition (STC).STC Irradiance 1000W/m2. Cell Temperature 25°C. Air Mass AM=1.5