FoxESS Community - Owners & Installers Forum

said that any broken kit / warranty issues are for Fox to sort out,

Well, your installer is wrong and you have some pretty cast iron legal rights which you may wish to remind them of.

The installer’s MCS certification can also be revoked.

@richt - did you ever get to the bottom of this? I've seen some wild swings in my battery capacity over the last few weeks with it tumbling from 90% to 20% in the overnight force-charge interval, and then only recharging to 85% despite 3kW of solar available. Have tried the techniques suggested ...

A poor connection between the BMS and inverter data lines can cause this fault, which does not recover until the system is power-cycled.

Check that the Ethernet cable is solidly locked in place on both ends.