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Advanced Solar Pump Inverter with Built-in Pid MPPT Technology. Single Phase/3phase 220VAC,99.6% MPPT Controller. MPPT maximum power point tracking, CVT constant voltage control, Dual power supply switching, Dry run protection, Low frequency protection, Low power protection, Sleep & Wake-up, Water full protection. High Efficiency MPPT / 99.9% MPPT Tracking Battery Free Built-in PID Constant Pressure Control PV & Mains Hybrid Power. Built-in PID Constant Pressure / Timed Irrigation / Dry Run Protect. Dual Power Switch & Built-in PID Control.