[RE-wrenches] Low voltage lithiums

[Mac Lewis]

Hi Kris,

When the BMS suddenly blocks charge, the voltage will spike up if the
charger can't respond quickly enough.

You may try to decrease charge voltage slightly.  This same affect can cook
an alternator in a vehicle as well.  Higher end BMS systems can shunt
current to mediate this.

Good luck!

On Sat, Nov 19, 2022, 5:32 AM Kristopher Schmid via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Greetings all,
>
> I have seen an issue on two different systems that I am hoping someone can
> shed some light on for me.  One was a 48 volt pack of 12 volt Battle Bornes
> and the other was a 24 volt pack of SOKs.  What happens is when reaching
> the end of the bulk charging stage, the battery voltage spikes and sends
> the inverter into an overvoltage error.  Can anyone explain what is
> happening and a solution?
>
> Thanks,
> Kris
>
> Shine On!
>
> Kris Schmid
> Legacy Solar, LLC
> 137 West 1st Avenue
> Luck, WI 54853
> www.legacysolar.com
> 715-653-4295
> NABCEP Certified PV Installation Professional
> Licensed Wisconsin Master Electrician
> BSEE
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