VEICHI SI23-D5 4kW solar pump inverter for three-phase 380–460VAC pumps. Solar input: DC 250–780V; rated output current: 10A; output frequency: 0–599Hz. MPPT efficiency reaches 99.9%, with inverter efficiency of at least 96%. Advanced MPPT/CVT control automatically adjusts output frequency for efficient pumping. Supports synchronous and asynchronous pump motors, RS485 communication and optional GPRS remote monitoring. Protections include dry-run, low-frequency, minimum-power, over-water, pump overcurrent, over/undervoltage, overload, overheating, phase loss and ground short-circuit detection. IP20; operating temperature -10°C to 60°C. Suitable for irrigation, boreholes, livestock and residential water supply. Professional sizing and installation recommended.