SUNER POWERWaterproof 30W 12V Solar Battery Charger & Maintainer PRO, Built-in UltraSmart MPPT Charge Controller, 12 Volt Solar Panel Trickle Charging Kits for Car Automotive Boat Marine RV Trailer

Outstanding Solar charger, Very Nice kit and seems to be charging very well.

Very easy setup. Multi mode charging selector allows parring the device to the type of battery you are trying to charge. Due to the relatively inefficient nature of solar panels in general, this size does appear to “trickle charge” or maintain my truck battery.

This charging panel is working perfectly, I had a battery with 4.75v and after 3 days of partly cloudy now 11.75.I have a 22 jeep cherokee that just sits. The setup couldn't be easier, it's plug and play. The price is fantastic because it includes the regulator for different types of batteries and usb devices. Fits easily in the window behind the shade stuck to window. I am relieved knowing the battery is being maintained.

I’ve tried several different solar battery charging systems and these by far exceed my expectations. In my opinion they are of high quality materials. The build is perfectly designed. They are very slim. The output is exactly as stated. I have 3 12w and 1 30w, all perform as they should. THE only thing that I could think of that would make these better is higher quality battery clamps, just a little on the cheesy side but they work for now, can easily be upgraded.

Not thrilled the charge indicator lights/charge regulator are permanently fixed to the back side of the panel. Permanently bolting it to my trailer I can’t see the lights, and you have to add at least a 2 inch spacer to clear that box. Other than that it works.

Works as intended. It charged my boat battery from 28% to 100%.

This unit appears to be a good unit with one exception. There are no protective caps to cover connections when disconnected. This makes the connectors very likely to short out on vehicle or other surfaces they may contact. This is especially dangerous if permanently connected to battery. Because of this I will be returning the product to Amazon. It is too dangerous.

I really like this panel. I have some devices in my specialized vehicle which draw current even when the vehicle is turned off. At times this could lead to a dead battery. This panel helps me maintain a constant charge. It's rigid but thin. It comes with four large suction cups on standoffs so the panel can securely attach to the windshield. Other panels I've tried would not stick properly because the charge controller on the back side prevented all four suction cups from touching the glass at the same time. The panel's controller has a button for selecting the charging mode (standard 12V, AGM, or Lithium). Once selected, the mode is remembered. A 4-LED bar graph indicates state of charge.