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

Good price, delivered on time, easy to set up and working as we speak. I’m using it outdoors to maintain 5 , 12 volt batteries. I definitely would buy another one. I love it.

My irrigation system uses older 12V batteries so they need a constant trickle charge and this does it well. To come up to full charge will take a few days but it is reliable and well made. The charge indicator is easy to see and does work accurately. In winter, I keep it on my tractor battery and it keeps the charge ready to go. Good unit, well made and good selection of connectors. Great choice!

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

Bought a 20W panel. Completely charges batteries quickly. Like that there is a stand to move from vehicle to vehicle. You'll have to replace the steel bolts and nuts used for the stand with stainless steel ones if you want to leave it outside. I would buy this again.

We seen this on another camper where we store ours and bought and it's been great keeps our batteries topped off.

I bought this to be able to recharge the battery on my 33 ft camper . Assembly was very easy! After setting up my camper slides and all it took less then an hr to fully recharge my battery. 1 thing I wish they included with this is a padded storage bag .

This works great keeping a charge on my rv battery, the only thing I wish was better is it doesn't fit the connection on my trailer so I just have it connected to directly to my battery.

Pickup battery gets drained due to continuous draw from on board factory electronics, this is keeping the battery topped of on my pickup.

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.

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.

Good

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