Connection and Function of a Generator and an Energy Storage Inverter

An energy storage inverter is generally equipped with a generator input port (generator/GEN port). The generator output should be connected to this port and must not be directly connected to the utility grid. The inverter controls the remote start/stop of the generator through a DO dry contact: when the battery SOC falls below the set value, the dry contact closes to start the generator; after the battery is fully charged, it opens and the generator stops automatically.
Its function is as follows: when PV generation is insufficient or the system operates off-grid, the generator provides backup power, supplying the load and charging the battery at the same time, thereby ensuring continuous operation of the system.
Precautions: the rated power of the generator should be greater than the sum of the load power and charging power to avoid overload. An ATS or reliable electrical interlock must be used. The generator and the utility grid must never be connected at the same time; otherwise, non-synchronous grid connection will generate a huge inrush current, damaging equipment and even endangering personal safety. Before wiring, the power supply should be disconnected. The wire size and circuit breaker should be selected according to the rated current, and grounding protection must comply with relevant standards. Power can be supplied safely only after the inverter has completed internal synchronization and the switch is closed.