Just to clarify
My system: BMS NG, Lithium NG, MPPT 100/50, Orion XS, MultiPlus 1600/70 and Cerbo GX and DVCC active in a motorhome.
SOC is getting lower and lower every day now in the fall, priority is MPPT → Orion XS → MultiPlus.
MPPT increases SOC a little every day but it is falling steadily, Orion XS will not activate (no driving), when will the charging from MultiPlus connected to 230V be activated?
I see two possibilities besides pressing “charge to 100%” on the cerbo panel,
Time is running out for balancing? (1 month?)
Low SOC reached
Hmm, if I turn off solar panels will MultiPlus start charging?
Is this analysis correct?
If the motorhome is put away for the winter with 230V connected, will the SOC then fluctuate between 100% charged and Low SOC? How to keep the battery at a reasonable charge level, say 80%?
I read some more…
The 30-day event is absorption
I have the SOC threshold set to the default 70%, why doesn’t MultiPlus start charging when SOC is down to 50%
Bug?
There are 2 possibilities, on the Multiplus you either have storage mode enabled or prefer renewable energy (used to be called wind and sun priority) enabled. Both have the same effect of holding the Multiplus charge voltage to 13.2V (default value) for 30 days (default value) and if after 30 days the SOC has not reached 100% then a full absorption charge occurs. The 13.2V will let the batteries get quite low but stops them over discharging.
Thanks “pw”
I landed a little in this and yes I have prefer renewable energy activated (though thinking about turning it off as it requires me to tap the screen to be sure I have a full battery and sometimes you forget). I don’t think I have Storage mode because I haven’t changed any settings in the Multiplus (a little more complicated to change), so it’s 13.2V renewable energy playing against that which is why it doesn’t charge from the MultiPlus.
It also says something about staying for 7 days in sustain mode for renewable energy and then charging fully but that might have been the case when it was called “Solar and Wind”
So to be clear, 230V or not, it will prefer renewable energy down to 13.2V if I don’t manually start a charge or 30 days have passed, right? (Or drive a bit)
SoC 70% then, when is it used?
Yes you have understood right about dropping right down to 13.2V but you will need to check whatever you have set in the prefer renewable number of days.
The solar & wind priority only applies to DC loads, AC loads will be powered from the grid.
The system should recharge your battery to 100% if you are connected to the grid for 7 days straight.
Okay, so the 7-day event requires that you are connected to 230V constantly for 7 days.
Yes, I understood that AC loads would pass through without drawing from the battery (with standard settings).
I ended up with this solution:
I deactivated the solar priority because the camper moves a lot (charging via Orion XS) and does well (days) without 230V connected with additional solar power (mppt) but once we get to a place and are going to stay for several days and we need a lot of 230V (mostly AC) then I don’t want to leave the place after these days with a possible drained battery (down to 13.2V). We may only be going a short distance to a place that doesn’t have 230V and DC-DC may not have time to charge the battery (and I forgot to start manual charging before we left).
So I want to top up the battery as soon as I plug in the 230V cord without having to adjust in the Cerbo screen.
I can still prioritize solar myself either by unplugging the 230V cable or simply turning off the MultiPlus and letting the MPPT do what it can. This will be the solution from now on.
And then I just want to say that then the 70% SoC is activated, if the battery drops below 70% it will be fully charged after that.
And if we were to leave a place with 70% in the battery, the Orion XS has enough time to charge it up (300Ah) even if it is a short distance to the next great place without 230V.
