Float voltage LiFePo4 battery

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amajor asked Aug 26, '20

Float voltage LiFePo4 battery

Hello,

I have a LiFePo4 12V battery and a Victron smartsolar MPPT 100/50 regulator.

battery présents recommends 14.6V. However default setting of LiFePo4 is at 14.2V for absorption voltage and 13.5V for float voltage. Should I change both absorption and float voltage to 14.6V? Appreciate in advance your help. Friendly regards

Adrien

MPPT Controllers Lithium Battery float

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Answer 1 · 2020-08-26T10:59:30Z

Stefanie (Victron Energy Staff) answered · Aug 26, 2020 at 10:59 AM

Hi @amajor,

you should use recommended settings from your battery manufacturer. But please check again with the data sheet of your battery. 14.6V as float voltage is way too high.

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amajor commented · Aug 26, 2020 at 11:58 AM

Hello,

Thanks for the response

The seller of the battery tells me absorption voltage is irrelevant for a LiFePo4 battery. Hence how can I reflect the same in the Victron regulator? Pls see attached the technical sheet of the battery

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Answer 2 · 2020-08-26T12:37:09Z

Stefanie (Victron Energy Staff) answered · Aug 26, 2020 at 12:37 PM

@amajor,

well. There are no definitions about the wording for the charge states. He may be correct in saying that absorption voltage does not matter, but at the same time the data sheet indicates that there is in fact a absorption voltage. You'll find that as Charge voltage or Bulk voltage. Both mean the same. So set absorption voltage to 14.6V (+/- 0.2V - thus even 14.4V will do the job) and I suggest using 13.5V as float voltage. And then hope that the integrated BMS will do it's job.

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amajor commented · Aug 26, 2020 at 12:41 PM

Thanks for the details and apologies, I meant to say the seller told me float voltage was irrelevant but I will indeed set as you have recommended to 13.5V. I have tried to put it at 14.6V but as you rightfully pointed out the BSM of the battery kept it at 13.5V

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