Multiplus C
currently going thru my config of the Multiplus Compact (24/1600).
I already adjusted some settings with help from a distributor, but I'm not happy as there are some unclear values, which I'd be happy to understand.
I plan to charge my LiFePo4 when connected to shore. That can be one day, or 1-2 weeks.
My idea is I don't need to charge to the extreme, as I am on 230V anyway in the charging situation.
Thus, my charging voltage settings are quite low.
LiFePo4 Balancing starts at 27.2 (3.4) end ends at 28.8V (3.6)
My Multiplus Compact float is currently set to 26.4 and absorption to 27.6V.
In The Victron Configure Software, there are some details I don't understand:
https://docs.victronenergy.com/veconfigure.html#charger-settings
Talking about these points:
Charger Settings
4) Lithium.
It seems, when I check this option, I don't have possibilities to adjust the absorption/float voltages, it's greyed out?
I'd like to use Lithium settings, but still adjust voltage values, for me the values are too high, my battery manufacturer suggests to set it lower.
So currently I've unchecked Lithium and adjusted manually.
Not sure if the resulting charge curve is good for LiFEPo4. In my understanding, especially after the absorption is done, it shouldn't hold the voltage any more to protect the LiFePo4 cells from overloading.
So would a "fixed curve" make sense, or what?
5) Storage Mode
How much will the voltage be reduced below float value? I find no values or percentage given in the manual. is there a storage mode for the Multiplus C at all?
11)Battery Type
My battery is a self built 2p8s LiFePo4 220Ah 24V,
So should anything specific be set here at all?
Again: the voltages which are preset for the Lithium mode are too high.
12) Absorption Time
I don t get it. Why will it be limited? Is it the time it stays on full voltage after that voltage has been reached?
Or is it the Time it charges with the Absorption Value, and after this time it goes to Float, even if battery is not full?
If so, where do I set the time it stays on full voltage after it is reached?
Currently set to 1h
13) Repeated absorption interval
I don't get this neither. Why is the loading dependent on an interval, and not on the "Full" status of the LiFePo4 pack?
e.g., the MPPT Smartsolar will load the LifePo4 till it reached the voltage , and eventually swith to float.
So how is this interval setting understood, related to the default loading whenever the battery is not in float or storage mode?
Currently set to 7d
14) Max Absorption Time.
I don't understand. Can u explain?
Currently set to 1h
Explanation to any of these setting values is highly appreciated !
thx