APOLLO G-500/ APOLLO GTP-500 series is high performance single-phase/ three-phase grid connected central inverter that controlled the operation by microprocessor that integrated with maximum power point tracking (MPPT) to extract the maximum power generated by PV array, and also system protection during failure of utility grid power supply. With high efficiency microprocessor, the inverters have capability to check electrical environment accurately and feedback the data to control itself in order to produce the proper solution for user such as display the electrical data both PV module side and grid line side, record power generated in each day and total generated power, record electrical data for past 180 days. These grid connected inverters are suitable for medium to large scale grid connected solar power system or solar grid tie system for residence, building, store or factory.