SUNAPEX Solar Battery Trickle Charger Maintainer 30W 12V Waterproof Solar Panel Trickle Charger for Car Boat RV Truck Motorcycle Marine Tractor Battery

Been using this for about a year now to keep my battery topped up in a RAM 1500. Truck mostly sits and doesn't get driven much so this is a great solution where you're parked too far away from a plug in trickle charger or don't want to run unsightly cables.

This solar panel is slow charging my truck battery and is able to keep it maintained. I am running 2 Garmin dash cams (front and rear) while the truck is parked. I leave these cameras running 24/7 for the security of my truck when parked outdoors. The cameras will save the video if there is any disturbance. The two cameras when standby and simply monitoring pull about 1/2 Amp from the battery. Over a number of days when the truck is parked the battery can start to run down because of the dash cams. This panel in full sun light is putting out about 2.4 Amps. On a bright cloudy day it is putting out anywhere from about 0.8 Amps to about 1.8 Amps depending on the density of the clouds. In most cases during the day this panel is maintaining the cameras to prevent the battery from being run down. When it is putting out more than about 1.5 Amps it is trickle charging the battery. The vehicle phantom current from its own electronics is about 0.06 Amps average. The user manual indicates after about 2 weeks of vehicle non use the battery may be run down. When parked for more than a few days the battery should have a charger connected to it. -- In most of the Japanese vehicles the 12 Volt cigar lighter socket turns off with the key. With most of the US vehicles the 12 Volt cigar lighter socket remains live. In some of the Japanese SUVs and trucks they offer both a switched 12 Volt cigar lighter socket, and one that is always on. In my truck I have an always on 12 Volt cigar lighter socket. Also, you can have your dealer wire in a fuse protected auxiliary 12 Volt socket for you. They can also wire in a pair of 12 Volt wires and you can custom connect them to the panel or operate any other type of 12 Volt devices. -- I would recommend this solar panel for battery maintenance. I found with the proper adapters it would be possible to put a number of these panels in parallel to have higher current. I have a friend with a large mobile trailer home and he wired up 20 panels in parallel to charge a bank of 12 Volt Lithium ION batteries. He is able to run his lighting, a computer, an RV fridge, and an HD TV with a sound system. All is using 12 Volts. His cooking and grilling is using propane.

Plus grand que je pensais, mais il entre bien dans un toit ouvrant standard (placé entre le verre et l'entre-toit interieur de mon VUS), vendeur très honnête ❤️ les accessoires et le panneau sont bien construit, facile a assembler et connecter 🙂 pas eu le temps de verifier l'efficacité, a suivre 😉

So I bought the 20 watt unit for my Yukon that sits mostly unused. I would go to start the car and sometimes it started sometimes the battery was dead and I would have to drag out a charger and extension cord. Eventually this killed the battery. So after getting a new battery I did not want to kill it and I did not want the hassle of a corded charger. The unit looks and feels well made and came with a variety of connection methods. My yukon cigarette lighter is always on so this made it a no brainer. I got the unit and hooked it up. My battery was at 12.4 volts after all day in the blazing socal sun my battery was at ......12.4 volts?!?!?!? I checked the no load voltage and it was 15.2 volts according to the label on the device it should have been 21v so no bueno. I returned it and opted for a refund rather than an exchange ,thank you Amazon, and ordered the 30 watt unit just to cover my bases as I was uncertain with how true the stated specs were. The 30 watt unit arrived and first thing I did was check no load voltage it was 20v hmmmm better than 15. After 1 day my battery was at 12.7 volts after the second day it was at 12.85 glad I went with the 30 watt . So I was going to order another but the price went from 46 to 69 dollars since I ordered on 8/3/25 gonna wait and see if it goes back down.

This wasn't seamless or simple for me to install in my Mother-In-Law's Nissan Juke. The cable wasn't quite long enough and it turn out the rear window is tinted so it seems the performance is reduced. These are not issues with the unit. I thought the packaging was excellent and the kit had everything you should need for installation. I found that the cabling is a little short for how I had routed the cable, and splicing the 16 ga wire with crimp connectors was...nightmarish for my fat fingers. Buy yourself and extension and save yourself some grief. The MPPT controller makes it easy to operate, no over charging and no back feed from the battery to the solar cell at night. I also purchased a battery connector kit that came with an inline blade fuse to protect the whole system from the unexpected. I wish there was an easier way to mount the solar panel inside the car. Hoping a valid solution will come to me soon. At the moment it is using up a fair about of cargo space in the hatch area.