Inverter won't turn on, relay stays open

The victron inverter either refuses to come on or it only comes on when power is low. I still have 12v power.

I have tried redecting the multiplus, replaced the relay, tried switching out the VE bus Bms, checking & resetting all connections to bms, and replaced the two thin 3 pole black cables between the batteries and the BMS (which oddly looked worse for wear after I replaced them only recently for same reason - like a chewed look to the insulation). The fuses all checked and look to be fine.

On the colour control I cannot see the solar chargers (which I recall showed originally) although the solar are clearly charging the batteries to full and it just says “off” under “system”. See pics attached. Relay state says “closed” under #13 on bms battery monitor even though batteries are at 100%. I’ve tried replacing the relay a few times.

The inverter does sometimes come back on itself out of the blue. I think it is to do with how much it is charging. Although in saying that I haven’t managed to get it back on at all today.

Any ideas? Have been at this now for almost a week and it’s driving me crazy