PowerFilm R-60 60W Rollable Solar Panel Charger Amorphous silicon thin film flexible solar panel is extremely lightweight at only 4 lbs (1.8 kg) yet provides 60 watts! Robust & weatherproof. PowerFilm solar panels are designed for the US military. Ideal for RVs, cabins, homes, boats, back-up and remote power use. 100% made in the USA. PowerFilm thin film solar panels are manufactured in Ames, Iowa. High performance solar charger charges a 12V battery system directly. It works in low-light conditions and on cloudy days, performing well even when partially shaded (a condition that causes other panels to fail). Built-in blocking diode protects against battery discharge at night.