Although a very small device, it works great with my Morningstar Sunsaver MPPT solar charge controller. Basically this device converts the RJ11 signal from the charge controller to RS-232 signals that can be logged with a PC.

The Morningstar MS-View software (free download) then reads the RS-232 signals via a ModBus protocol to log and graph your panels array wattage, voltage, load current, charge state, etc.

In the two weeks I've been using this device, my PC has been logging data from the MPPT controller every 5 minutes and has never failed to connect. Works great!

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