topsolar solar panel kit 100 watt 12 volt monocrystalline off grid system for homes rv boat + 20a 12v/24v solar charge controller + solar cables + z-brackets for mounting topsolar specifications nominal voltage (vmp) 23v nominal current (imp) 4.3a open-circuit voltage (voc) 27v short-circuit current (isc) 4.5a cell efficiency 19.5%