Thanks for the quick reply. I tried feeding 24v from the inverter to the 12-24v input but it just lit up a led on the BOB - not sure what the purpose of the 12-24v input is.

I haven't altered anything in the inverter programming for the pot - you may have hit on it. I've been using these things for years, don't know why I didn't think of it straight away. I'll check it in the morning. Thanks.