Please enter the size of the proposed solar installation in watts (watts DC). Typically, the capacity of your solar energy system to produce electricity is described in DC. The number of panels times the panel wattage equals your system’s DC capacity: i.e. 20 panels x 320 watts each = 6,400 watts DC. Please note that if you’re receiving proposals from solar companies, this may be provided in kilowatts (kW) or megawatts (MW).