I need your help. I am trying to find out how I can use the relay assistant based on charge state.
It is possible to select during setting the assistant on four different "WHEN" states:
- when charging
- when not charging
- when bulk finished
- when absorption finished
I have a three phase ESS system with a AC / grid based PV system and a pylon battery bank with 17,2 kW useable energy. I am trying to find out how and when the relay will be set / reset.
I setup the assistant in the Multiplus-II for phase no. 3 according to the followings screenshot:
and the relay is set indeed when bulk is finished. Great! I understand! But it is never reset as I thought when absorption is finished. Okay it can happen during absorption phase, based on the needs of energy and / or PV harvest that the absorption switches from absorption after 20, 40 or 60 minutes back to discharging or bulk phase. But never, NEVER this was obviously the sign for "absorption finished" and the relay always stays SET and was never reset, as long as I investigated the system.
So what has to happen or what has to occur that the relay is switched off, based on "absorption finished". Who can explain it to me?
Same with my investigation with the relay assistant on phase two:
I am sure it is some how naive, but I just thought when the Multiplus is not charging the battery it switches the relay ON and in the same sense when it is charging it sets relay OFF.
But after several days of investigation, the relay stay always OFF and there is no effect in the relays contact when charging or not charging the batteries.
What is wrong in my mind and my thinking?
Is there any body who has experience in this and can explain it to me, please?