OK, investigation complete ... don't use the 'Remote' connections. These are solely for turning the BatteryProtect on or off i.e. just a master of/off switch. You need to use the Alarm terminal.
The Alarm terminal basically provides a ground return when it activates i.e. depending on voltage IN and whatever programme is selected:
View attachment 21727
And your inverter's (
when switch to EXT) Terminal Block 4a has an opto-coupler that is seeking a power supply referenced to an independent ground in order to activate:
View attachment 21728
So you should be able to mary-up the ground-seeking circuit to the ground-providing circuit to control the inverter either by:
- Providing a ground for the in-built supply that I assume is offered on terminal 'S' (Option 1) OR
- Provide both supply and ground to terminals '+' and '-' (Option 2)
View attachment 21734
Now unfortunately, this will turn the inverter on when the BatteryProtect tells it to turn off!! I'm working on that, but for now, my brain is mush - I need some sleep!!