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Florian Koenigk avatar image

Settings for Li-Ion 48V Battery Pack

Hi folks!

I have the MPPT 100/20 48V Solar Charger up and running, charging a 48V Li-Ion battery pack.

The OCV for Panasonic GA cells (13 in series) is going from 42,3V (SOC = 7,5%) up to 53,9V (SOC = 97,5%); This is the working range.

Now I am trying to find the best settings. Could you please help me with that!
How should I set
- absorption voltage
- float voltage
- equalization voltage (really needed for Li-Ion?)

- Re-Bulk voltage offset (what is it for?)
- Absorption duration
?

Thank you very much in advance!

Regards, Flo


MPPT - Solar Charge ControllerBMV Battery MonitorLithium Battery
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1 Answer
Jason Bolduc avatar image
Jason Bolduc answered ·

How should I set
- absorption voltage

Set this to your high voltage charge cutoff.


- float voltage

Set this to your nominal cell voltage. for example, if using a LiFePo4 16S battery pack it would be 3.2 x 16 = 51.2v. This could be set higher but there are trade-offa.


- equalization voltage (really needed for Li-Ion?)

Never needed on lithium based batteries

- Re-Bulk voltage offset (what is it for?)

Another setting that has a but of personal preference.. typically0.5 to 2v lower than the absorption voltage.


- Absorption duration

Generally not needed with lithium chemistry batteries.

These settings are quite important and setting them wrong can damage the battery and possibly void warranties. Always follow the manufacturer's settings.


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