To add to Jeff's suggestion of targeting 95%, many Li+ batteries have a
spike in voltage as they reach 100%. We just don't have to worry
anymore about sulfate damage from under charging.
Ray Walters
Remote Solar
On 11/19/2022 7:14 AM, Jeff Clearwater via RE-wrenches wrote:
Hi Kris
What voltage do you have your charge settings at?
I recommend that bulk or absorb voltage for lithium iron phosphate not
be set above 56 V - there is no reason for it even though many
manufactures suggest higher settings. In cases where total
storage is sized generously enough I often use 55.6 or even 55.4 in
order to target 95% as full instead of 100% in order to extend cycle
life. and for float there’s no reason to ever go over 54 V and
better maybe even to be in the mid-53s.
See if that helps assuming you had it higher.
The other thought is you have one bms that is perhaps not protecting
overcharge and allowing a temporary spike when the others do limit.
Hope that helps!
Best Jeff C.
Village Power Design
Sent from my iPhone
On Nov 19, 2022, at 6:32 AM, Kristopher Schmid via RE-wrenches
<re-wrenches@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 <http://www.legacysolar.com>
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE
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