Boulder 90 Solar Panel Use with a Goal Zero portable power pack (Yeti 400, Yeti 1250) or solar generator to charge your gear day or night Delivers up to 90 Watts of power, but the angle of the panels and the cloud coverage can impact its performance. Avoid the shade. It will not work indoors 32 x 32 x 1.25 in 18-22V MC4 Connectors: 14-22V, up to 6A (90W max)