The Growatt SPF 3500~5000 ES is a versatile solar inverter featuring an integrated MPPT charge controller for efficient energy management. It supports equalization charging to extend battery life and can operate with or without a battery. The inverter handles PV input voltages up to 500VDC and allows for configurable grid or solar input priority. It offers optional remote monitoring via WIFI/GPRS and supports parallel operation for capacity expansion up to 30kW. Additionally, the system enables PV and grid power to jointly supply the load if PV energy is insufficient, with flexible scheduling options for inverter charging and discharging times.