For off-grid mode the MPPT controller accepts a voltage range between 90 and 160 V (120 V is recommended for optimal efficiency of the MPPT). The maximum power output for each MPPT does not exceed 3.3 kW. For on-grid mode on the other hand, the MPPT controller accepts a voltage range of 200 to 600 V, with a recommended range from 300 to 400 V .