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suhayb avatar image
suhayb asked

Lithium battery 12.8v 60 Amp

if i put 2 LFP battery 12.8v 60 amp in series and the starting current for the truck reach 600 Amp what happens to the lithium battery?

Lithium Battery
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4 Answers
ejrossouw avatar image
ejrossouw answered ·

More specific details about the battery is needed to determine its maximum surge capacity and continuous delivery rating. However since this battery system falls well short of 600A I do however expect a much shortened battery life, high risk of overheating and possibly fire. Best to check with a professional battery supplier if they have any experience as this is a solar forum. Typically you also still see LA used for starting generators next to a Lithium installation.

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suhayb avatar image suhayb commented ·

thank you but the starting current for the truck or vehicle just need around 600 Amp for 5 second

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adev avatar image
adev answered ·

In fact, the older VICTRON pre-smart battery datasheet lists 600A 10 second discharge current for the 60ah batteries. However they also make it very clear you need to be using a BMS if you run them in series or parallel in case of cell over or under voltage, so be warned.

I’m not 100% sure the newer smart batteries have the same specs.




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suhayb avatar image suhayb commented ·

thank you for your support

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kai avatar image kai ♦ commented ·

The current datasheet no longer has the pulse current rating. I think it may be Victron's way of saying its at your own risk.


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juliayu answered ·

I used to work in Winston factory for 4 years, Victron is using Winston cells, the 12V battery is not designed to be used in P or S. So your intention of using 2 12V batteries in P is not good. Plus 600Ah big current, serious damage for batteries. Please do not try so. Better consider 8×60Ah cells in S than 2 12V60Ah.

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Justin Cook avatar image
Justin Cook answered ·

@Suhaybk, it's not recommended to use LiFePO4 batteries as starting batteries. There are multiple reasons for this; the first, as addressed in previous answers, is simply that most reputable LFP drop-ins have a BMS that will shut down the battery when subjected to a load so significantly exceeding their peak rating. Another reason to not use an LFP as a starting battery is that the temperature extremes generally to be found in an underhood mounting configuration will dramatically shorted the lifespan of your LFP battery - if not in fact cause the BMS to shut down charge/discharge of the battery as well. And a final excellent reason to not use an LFP for a starting battery is that the start battery is typically charged directly by the alternator, and it is NOT safe to charge an LFP directly from your alternator unless you have a "smart" alternator or an external regulator that is specifically designed with an LFP profile.

Currently, AGM batteries are still the best cost-effective option for starting batteries if you want the PCA ability of an FLA battery with an extended reserve time; if cost isn't a particular factor, you can of course go to the carbon foam batteries like the Firefly Oasis for all the benefits of an FLA/AGM with a good helping of the discharge capabilities of an LFP.

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