[RE-wrenches] Low voltage lithiums

Sat Nov 19 11:00:36 PST 2022

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  offgridsolar at 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 at 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- dana at solarwork.com
> 
> On Nov 19, 2022, at 7:15 AM, Jeff Clearwater via RE-wrenches 
> <re-wrenches at 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 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 [1]
> 715-653-4295
> NABCEP Certified PV Installation Professional
> Licensed Wisconsin Master Electrician
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