Instapark SP Series Mono-crystalline Photovoltaic PV Solar Panel (Charge Controller NOT Included, 15 Watts) Powerful 15 Watts high efficiency mono-crystalline solar panel ;can be used in single-module and multiple-module systems Maximum power voltage ( Vpm ) : 17.0V ;Maximum Power Current: 0.89A Cable lengths : 3' Dimension 18 1/4 x 12 x 2/3 in Open circuit voltage ( Voc ) : 21.20V