question

I've got a Multiplus 24/3000/70 and I need help with the programmable relay.

The Multiplus is the only Victron component in my stack. The batteries are charged using PVs via a Midnite charge controller and this controller uses an AUX2 algorithm to PWM a 12VDC signal to an SSR to engage an immersion heater so I can maximise my PV harvest and dump into hot water when the batteries don't need the charge..

I have wired in an AC source available from a community hydro supply but I only want to use that as a last resort (I have to pay for it) if there is no sun for a while and batteries are going flat. So I have used VE Configure 3 to define 2 Assistants ('general user flag' & 'generator start and stop') so that if the battery voltage or load conditions are triggered the AC input is connected, then disconnects when the batteries have gone through bulk. It works well. However if the AC input is connected, as the batteries move through their charge cycle, I do not want the Midnite AUX2 signal to reach the SSR.

Here's the point I need help with. I want to receive a relay signal from the Multiplus when the AC source is connected (by the other 2 assistants). I could use an external load sensing relay (e.g. Lamonde ACS200) on the AC in but I feel certain that I could define a 'programmable relay' to give me a signal when the AC in is loaded.

There is a green screw connector block on the top right of the Multiplus circuit board (NC/NO/Com). I can't figure out what programmble relay assistant settings to use although the following looks like it ought to work...

*) Use primary programmable relay

*) Set relay off (or on)

*) when AC1 available for 10 seconds

The signal path would be 12VDC in series from the Midnite AUX2 to the relay block on the Multiplus to the SSR.

I've searched the community and goggled but so far not succeeded. I can't be the first person to try this. Any help would be appreciated.