Victron Multiplus-II 48/5000 3phase with lithium ion battery

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Yaju Rajbhandari asked Jul 19, '23

Victron Multiplus-II 48/5000 3phase with lithium ion battery

Hello,

I am trying to setup the Victron Multiplus-II 48/5000 3phase with customized lithium ion battery pack. I am planning to use 15s cell with voltage range from 4.1 to 4.0 so the voltage stays within the 66 max Voltage range of the system.

How much will this affect the system, should i try to reduce the series connection? Any one who has work with this type of system please let me know.

The Battery voltage range i am planning to use ifs61.5 V max to 48 V min..

Lithium Battery battery system voltage

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nickdb ♦♦ commented · Jul 20, 2023 at 11:37 AM

That is a seriously high cell voltage, I would make sure the manufacturer is happy with that.

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kevgermany ♦♦ commented · Jul 20, 2023 at 11:45 AM

Assuming you're using LiFePO4 cells, please read this and reconsider

https://www.evworks.com.au/page/technical-information/lifepo4-care-guide-looking-after-your-lithium-batt/

If you're using Lithium ion or Lithium polymer, the voltage is ok, but there's a much higher fire risk and they shouldn't be used without proper safety precautions.

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Answer 1 · 2023-07-19T15:46:24Z

mvas answered · Jul 19, 2023 at 03:46 PM

61.5 volts (batt) = 15 cells x 4.1 Volts
61.5 volts (batt) is less than 66 Volts (max)
So, what is the problem?

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Yaju Rajbhandari commented · Jul 20, 2023 at 11:15 AM

Will this affect the Inverter in any way?

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kevgermany ♦♦ Yaju Rajbhandari commented · Jul 20, 2023 at 11:52 AM

Please see my answer above.

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kevgermany ♦♦ commented · Jul 20, 2023 at 11:44 AM

4.1V

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