Another reason as Bradley suggests to avoid all of these problems and
only install a closed loop battery power system. Zero problems since
Discover
came out with the AES in 2018 or so. A 25% gain in charge time that
genset users will love by closing the loop. Lot's more also!
Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail offgridso...@sti.net
text 209 813 0060
On 2022-11-19 10:28 am, Bradley Bassett via RE-wrenches wrote:
On some LFP batteries the cell balancing only happens at full charge,
so you do need to get to full every so often. Discover AES is one that
needs this.
Brad
On Sat, Nov 19, 2022 at 10:10 AM Dana Orzel via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Another issue is what charge controller are you using? I know for me
with Outback products I've had to switch from an FM 80 to the OB - FM
100 in order to have a more accurate high-voltage cut out voltage.
The FM 100 has a much more accurate micro processor in it then the FM
60 or 80 per Brad Bassett with AEE.
Dana Orzel
C: 208.721.7003
E- d...@solarwork.com
On Nov 19, 2022, at 7:15 AM, Jeff Clearwater via RE-wrenches
<re-wrenches@lists.re-wrenches.org> 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 [1]
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
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