Any surge requirements (common with compressors and motors, such as in refrigerators, well pumps, etc.) need to be checked against inverter ???surge??? or ???overload??? specs (see ???Sizing a Battery Based Inverter??? in HP149).Since the inverter draws from a battery bank instead of the PV array, the DC voltage input needs to match the nominal battery bank voltage (generally 12, 24, or 48 V).