... 300W solar panel, use damager solar cell pretend A-grade sold to the customer, that’s why some factory providing ... , if you buy from us you deal with not just a seller; the whole technical team is behind you ... you want 36V, so you can charge 24V battery, just loose the cable from the solar panel and connect them ... in series, if you not sure what to do, just mail us.7. What is the Warranty Period, How ...