Sun Energise 20W 12V Solar Powered Battery Charger & Maintainer, Built-in Smart MPPT Charge Controller, Waterproof 20 Watt 12 Volt Solar Panel Trickle Charging Kits for Car Auto Boat RV Marine Trailer

Installed on my cabin cruiser, seems to maintain batteries with the electronics running, charges pretty fast, was easy to install and seems really well built and looks good

10a～40aまでのバッテリー搭載の耕耘機・軽トラから乗用車迄数台を充電しています、オプションとして4～5ｍ位の延長ケーブルがあると良いと思います。

Waited two years to write this review so here goes, My solar panel is installed on the back of my pontoon screwed to the railing, its charging 3 deep cycle batteries that run the pontoon and 1000watt stereo system on it I have yet to run the batteries dead on the lake with the radio and everything running hard for more than 12 hours straight the panel has been exposed to all elements rain and snow, It keeps my batteries charged year round I was amazed how well it works and easy to install it was definitely worth the money I spent on it to have my batteries well maintained and ready to rock when we roll out on my party barge

This small solar panel works perfectly to keep our motorhome engine battery fully charged while in storage.

Too early to tell how this solar battery maintainer will perform. So far the quality looks well made and it started giving positive charging indications when started. Delivery was quick, received unit three days after ordering.