20W Epoxy Solar Panel Kit with 10A Controller for 12V Camping Home Car Battery This is item is 20W 18V with battery clips, can charge the 12V battery directly, it will output max 90% power in the sunny day. As we know the source of the earth is decresing fastly, however we also can use the solar panel to produce the electricity in the sun, it is so amazing. Waterproof and light design, let the solar panel easy to take outdoor, you can take it to camping, hiking, and travel. This is also a good item to teach kids how magic the sun is, and how can we save the sources of the earthy. 3-stage charging algorithm: impulse, bulk and float