1. solar power: 40w/18v 2.high quality Grade-A 3.transferring efficiency>15.8% 4.good weak-light performance solar module 1. solar power: 40w/18v 2.high quality Grade-A 3.transferring efficiency>15.8% 4.good weak-light performance solar module, 40w solar module:SpecificationMaximum Power40WWpPower Tolerance±5%Optimum operating voltage18VOptimum operating current2.22AOpen ciruit voltage21.6VShort ...