OYMSAESolar Battery Charger 12V Solar Powered Battery maintainer & Charger,Suitable for Automotive, Motorcycle, Boat, Marine, RV, Trailer, Powersports, Snowmobile, etc.(1.8W Amorphous)

I use it on my horse trailer to keep emergency breakaway battery charged when not in use

Quality is good! Eazy to set up! Operation is also eady!

Haven't driven much lately, the car battery was at 11.8v.Plugged this into power port that is always on, 2 days later the voltage is up to 12.1 and the horn doesn't sound garbled when using the keyfob to lock the doors.Am sure this will fully charge the battery within days.

Literally JUST GOT THIS, and wow was installation a breeze.So I'm a long-haul trucker, and in the dead of winter I often come back to a vehicle that won't turn on at -10 thanks to a just-slightly-drained battery. So this year, I decided to get this before winter to keep my battery at peak voltage so I never have to jumpstart my car in the dead of night.And installing it was as simple as tossing it in my back window, and plugging it into the 12v port in my center console (for me, this one is an always-on port, so it will charge the battery with the car off.What surprised me most was that when I attached my multimeter to the plug end (before connecting it to the car!), I was reading 11.1v and .66amps. Or, 7.3Watts. As this is rated at 1.8W, I was pleasantly surprised! And this on a highly overcast day, too. Just wow. High expectations!

They worked a bit for awhile. It was hard to get the light to turn green indicating a good connection and charging. You really had to fiddle. I kept noticing that when I'd come around to the cars that had the chargers that I had to fiddle around again. Eventually they just stopped working completely.

I bought these to put on my motor home batteries while in storage. I live in Florida , so we have sunshine almost everyday. Where the batteries are I cannot put suction cups on a window. I attached them to the side of the motor home. It is a smooth flat surface. They fell off in just a couple days. The suction cups are tiny and I don't know how they would stay anywhere for any length of time. Unless I can figure out a way to attach them to something to stay in the sun, they probably won't be much use to me.

This has worked great for us so far on charging a battery on our boat. No complaints here!!

Bought this device a little over a year to keep the battery charged on the generator at our hunting camp. Works exactly as described. Has never let us down. Well worth the cost. Easy to set up - everything needed is provided. I would definitely buy again and recommend it.