Growatt Hybrid Inverters - Any way to put them into and out of Standby Mode?

I have 4 of Growatt SPH6000TL BL-UP hybrid inverters with Lithium battery setup as Lead as my BMS won’t talk to the Growatt

It works fine most of the time but occasionally one inverter, whilst being in Battery First Mode doesn’t charge it’s battery. If I put the Inverter into Standby Mode, and then out of standby the battery normally starts charging okay.

The problem is the batteries charge at night on off-peak and staying up half the night is starting to get me down

Is there a way to automate the standby mode from either HA → MQTT → Solar Assistant → Growatt, or HA via the Growatt integration?