I purchased this to help keep the battery in my travel trailer charged. I don't use the trailer much yet but the lights have worked whenever I do without fail. It was an easy straightforward install and the cord was long enough to run it into the battery compartment from the roof. It even charges on cloudy days. The brace it comes with is a good idea but could be a bit shorter. I can see it working great for applications where one would need to get up over something but to me it sticks up too far on my roof. I would have preferred something less visible from the ground. For the price it's a good buy I think.

Works great! The price is good too. It's light, durable and efficient. Keeps my two deep cycle RV batteries charged.

The SOLPERK Solar Panel Kit 20W 12V proves to be a highly efficient and reliable solution for keeping my RV battery charged. Its performance is impressive, and the upgraded controller, along with the adjustable mount bracket, adds to its versatility. However, I encountered a minor issue with the length of the cords. Since my RV is stored under covered parking and the battery is located further back in the side compartment, the existing cord length doesn’t quite reach from the ideal placement of the panel at the front, where it gets the most sun. Despite this inconvenience, the overall functionality and efficiency of the kit are commendable. A longer cord would make this product perfect

Neat little solar panel for maintaining or even (slowly) charging a battery. The solar controller is simple and works good.

It works excellent it does what they say it does keeps the batteries on my mower and tractor charged at the same time I love it I gave it 5 stars because 10 isn’t an option

This controls the charge on the battery and detects when the battery is fully charged and stops charging (so battery is not overcharged).

This works super great for keeping a vehicle battery full that's sits a week or two between usage during sub 0 temps. The super cold weather would weaken my battery if I didn't start the vehicle once a week. With this now I don't have to worry if I go 2 weeks!!

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

Good

Good quality

I purchased with the hope that this charger would keep my car battery charged over several months while I was away from home. I have now used it twice, both for two month periods where the car was parked under a carport. Even though the charger was not in full sun, it has worked and the battery has been fully charged each time on my return.

Will be perfect for Holiday unit to keep stored Suzuki ‘s battery fully charged and prolong its working life

First attempted was completely cracked. Item need to be shipped with better bubble wrap. Bubble wrap to thin. I did get a refund and order another one and my husband loves it.