Schumacher Electric Solar Battery Maintainer, SP-400, Water Resistant, Amorphous Solar Technology, 4.8 Watts, 12 Volt, for Motorcycle, Power Sport, Car, Truck, RV, and Marine Batteries

Excellent ... Couldn't be easier to use and works as intended. NOTE: ALWAYS "connect" your solar panel to controller LAST and "disconnect" the solar panel from controller FIRST.

I recently purchased the Schumacher SP-200 2.4W Solar Battery Maintainer for my motorcycle and I am extremely satisfied with its performance. The device is water-resistant and can be left outside in any weather condition, which is a great feature.The solar panel is incredibly efficient and charges my battery quickly and effectively, even on cloudy days. It has helped me maintain my battery's life and saved me the trouble of having to jump-start my bike every time I want to use it.The SP-200 is very easy to set up and use. It comes with all the necessary cables and connectors, and the instructions are straightforward and easy to follow.

Es muy grande se necesita espacio y no es para batería de gel

Buen producto, ligero y resistente al agua

The instructions sheet mentions a blue LED that lights up when 12V charging is available. I never saw this on either the original product or the replacement that they sent in. I never saw any voltage out of the 12V side either, including when measuring with a light load attached. The first one they sent only had a female cigarette adapter. The second had a couple of additional cables, but that's a moot point as there is no output. Did not test the USB functionality -- assuming it works but there are many competing products that charge USB and only a few useful for charging shortwave radios (10-12VDC). Returned both units; the quest for USB + 12VDC continues...