- Solar Panel 25W 18V Monocrystalline Waterproof Panel for Charging 12V Battery of RV Boat Trailer ATV Car or Powering Light, Charing 12V Battery Pack and Other Off-Grid Applications

Nice solar panel. Perfect size for trickle charging the battery on my 4wheel camper. Already had a controller installed so I needed a panel without one. Works great.

I bought four of these panels to maintain a charge on my 48 volt battery backup system. I tested each of these individually and then together before installing them. Individually, each panel put out 24+ volts at midday mounted on a 25 degree slope at latitude 43 degrees. Connected in series, on a flat surface, they together produced 90+ volts at .6+ amps. This is more than adequate to maintain a charge. 8/25/2025 edit with photos. These panels are secured as one portable assembly and are actually maintaining two battery banks, a primary and a secondary. Each bank has its own charge controller but both are fed in parallel from the single panel assembly shown. This is all for battery maintenance. I have a much larger solar arrangement to deploy if needed to run electrical loads. This arrangement has been doing better than expected and I can recommend these panels

This panel works great to power the pump for a solar hot water system. Hopefully it will last for many years.

I own a number of solar panels of various brands (most are very similar so shop by price for the size/wattage you're looking for), and so far I've had really good luck with them. This one is no exception. These newer panels are more efficient, so they produce more power with a smaller size. This one works well for keeping a battery maintained using an inexpensive solar charge controller. I like to hook up jetskis, my boat, tractor, plow truck, etc to this type of setup as it keeps the battery topped off between uses. Time will tell if this one holds up as good as previous panels. I'll update this review as needed once it's been out in the weather for a while.

Panel came pretty well packaged with in its own box. foam inserts on the corners. However I would have liked a foam sheet over the panel itself but this is an inexpensive panel so can't expect too much. Wires are very short and small gauge, maybe 18awg? They are connected to the panel in a sealed caulked box. while this is good for some, I always like to replace the cheap wires with higher grade 14 AWG marine cables. I was not able to in this case which is disappointing. The aluminum casing which the panel is connected to is small. I have a similar panel from another company who's case is much larger allowing easier mounting. This panel has very little room between the aluminum case and the panel, so small I can't even get my fingers in between them. This makes putting screws/bolts in extremely difficult! Operation. In testing it seams as though this panel puts out the advertised voltage and amps. In less then full bright sun it lacks, but that's to be expected with solar panels. This is a decent inexpensive solar panel but the small casing and hard to mount options and the sealed non changeable cable makes this loose a star for me.

Just purchased this ECO-WORTHY Solar Panel 25W 18V Monocrystalline Waterproof Panel, it arrived today. I connected a 10 ohm 50 watt resistor as a load to test it out as some others have complained about it not putting out what it was rated for. (The 18v is with no load). It was sunny with some clouds so in a cloud free sky I might have got a little more output. I measured 14.42 volts and 1.46 amps that equal an output of 21 watts. More than enough to power my Renogy 10 amp solar controller to keep the battery on my home generator charged. You can see the volts and amps in the pic. A few small clouds blocking a little of the sun saw the output drop, which is expected.

Okay I’m not an expert with solar panels, this one worked nicely for a while then noticed my charge controller showed low voltage even tho the panel was in almost direct sunlight. Pulled the wires and put my multi meter on them and the voltage was jumping around all over the place. Not sure where to go from here. Is the panel bad? Is this normal behavior? Guess I’ll start shopping around for a replacement. UPDATE: seller reached out and with actual knowledgeable help and offered to walk me through diagnosing the problem. When a solution couldn’t be reached quickly offered a replacement. I really appreciate the effort on the sellers part to rectify the situation. Would definitely do business with them again.

18 watts output on a clear day around noon in the winter through a MPPT controller, which is respectable. Provides some output even without full sun or if partially shaded. Well constructed. I would buy it again.

las utilizo para cargar las baterias de los pastores electricos para ganado donde no hay posibilidad de enchufar a la red me evitan tener que cargar semanalmente en cargador algunas tienen dos años de uso y como elprimer dia

Very pleased with the little panel. Have it on the carport roof keeping the camp battery topped up.

Great price and delivered quickly. Seems to charge even on dull days.

The panel output was better than rated. The panel worked great, even though the 25 watt panel came in a box marked 20watts, the panel had the correct info on the back.

Nickel