400 watt folding panels. Just started to use them and was getting nearly 300watts before 9am. Unfortunately i couldn't see what they would get to at full sun since they charged my battery to 100% by 9:30am and i only setup them up approx 8:15am so 27AH in under 1.5hrs. Thats a good problem to have. Tried parrallel and series - think ill stay with the high voltage series config due to less connectors required but good that they come with all the adaptors to suit numerous voltage configurations.