I've been developing my Mode 3 control loop for a MultiPlus 2 GX over the last few days and noticed an undesirable effect I would like to eliminate. When the AC Setpoint is 0 at night, there is a constant drain on the battery of about 38W. This seems like quite a lot more than the idle usage. I can hear the Multiplus humming during this idling, so it certainly seems to be doing something unnecessarily.
See the attached graphs between about 0100-0600 - the bottom-left Battery Power graph is probably the most visible indication of the drain.
Firstly, what is this drain likely to be? And can I stop it?
I have nothing connected to AC Out 2, and AC Out 1 is connected to a double plug socket, which was unused. There is only one other device connected to the DC system - a SmartSolar charger, slaved to the ESS.
I heard the usual drain of the MultiPlus 2 should be about 11W.
When I disable my control loop completely so that the AC Setpoint timeout kicks in, the system falls back into "ESS Passthru" and the battery usage goes right down to what I would expect it to be - plus this humming noise stops
So secondly, is there anything I can command in my Mode 3 control loop to actively put the system into ESS Passthru and keep it there? Or do I simply have to stop sending updates and allow it to timeout.
Is there another better way to get ESS Mode 3 into some kind of "idle but ready" state?
I would probably rather this constant drain came from the AC In rather than the battery, so as not to unnecessarily cycle them. So should I set the AC Setpoint to like 11 or something when I want it to idle? (But then what happens if it doesn't actually want to use this 11W, I don't want it constantly trying to shove it into the already-full battery)
Thanks!
