[RE-wrenches] SOC, FNDC, and LFP batteries

[Jerry Shafer]

Lou
Sounds like you are having the same issue we did, l adjusted the size of
the battery down to 50% of the battery rating and so far the values appear
to follow in. We will also be installing a DC  CT on the egauge to see and
have a better idea of whats going and out outside of the BMU
Jerry

On Fri, Aug 17, 2018, 12:09 PM Lou Russo <lou at spreesolarsystems.com> wrote:

> Hello All,
>
> Does anybody have any insight in getting the SOC to report accurately on
> the Outback FNDC when using batteries that have a minimal voltage curve? I
> have several systems with LFP batteries that have both a eGauge
> (communicating directly with the battery BMU) and a FNDC and I get wildly
> different SOCs. In a typical  24 hour period (12am-12am) I get SOCs on the
> FNDC that vary 2% to 34% of what the battery BMUs are reporting. I am
> assuming that the BMUs are reporting accurately. I would think a 1%-5%
> difference would be acceptable.
>
> Any help or thoughts on this subject  would be greatly appreciated.
>
> Aloha,
>
> Lou Russo
> lou at spreesolarsystems.com
> 808 345 6762
> Spree Solar Systems LLC
> CT-34322
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive:
> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20180818/7000dbf3/attachment.htm>