C.R.I.'s Solar Pump Controller V4.0 is the MPPT variable-frequency drive matched to the brand's full 1–10 HP solar pump range, in AC- and DC-pump versions. It accepts 120–750 VDC of PV input and delivers 110–380 V variable-frequency output, with in-built protection against over-current, short circuit, earth fault, reverse polarity, surge and dry run — plus incoming DC fuses and an MCCB for the AC input.

A power-sharing methodology lets pumps run from solar and grid electricity, and remote monitoring over GSM/GPRS with RS485/RS232 offers fault monitoring and online programming. Certified to CE, UL, CUL, CSA, C-Tick and GOST R; operating range −10 to +50 °C at up to 95% humidity. See the compatible C.R.I. pump families below.