<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Lou,<div class=""><br class=""></div><div class="">On some of the Li battery brands that we sell, if the shunt current is +/- 1 Amp from zero, the current is not counted. On larger systems I have seen +/-2 Amps not counted. If the system spends much time there, counting error can accumulate. A battery can shut down on LV while the SoC meter still shows a high percentage. We have seen this several time from customers that don\u2019t want to fully charge thinking they will make the Li battery last longer (damn internet blog myths). The solution is to fully charge regularly where the SoC counter is automatically reset when full charge parameters are met. </div><div class=""><br class=""></div><div class="">If you can force the FNDC SoC to reset each time you full charge, it may provide better accuracy between your two counters. We often use Magnum Energy ME-BMK and it is always very close to the Li battery SoC because they both reset at full charge. </div><div class=""><div class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br style="orphans: 2; widows: 2;" class=""><span style="orphans: 2; widows: 2;" class="">Larry Crutcher</span><br style="orphans: 2; widows: 2;" class=""><span style="orphans: 2; widows: 2;" class="">Starlight Solar Power Systems</span><br style="orphans: 2; widows: 2;" class=""><br class=""></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline" style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class="Apple-interchange-newline">
</div>
<br class=""><div><div class="">On Aug 17, 2018, at 12:09 PM, Lou Russo <<a href="mailto:lou@spreesolarsystems.com" class="">lou@spreesolarsystems.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><span id="gmail-docs-internal-guid-6934b5d4-7fff-c4d2-710d-73d94bc9268d" class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><span style="font-size: 11pt; font-family: Arial; background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; vertical-align: baseline; white-space: pre-wrap;" class="">Hello All,</span></div><br class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><span style="font-size: 11pt; font-family: Arial; background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; vertical-align: baseline; white-space: pre-wrap;" class="">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.</span></div><br class=""><div style="line-height: 1.38; margin-top: 0pt; margin-bottom: 0pt;" class=""><span style="font-size: 11pt; font-family: Arial; background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; vertical-align: baseline; white-space: pre-wrap;" class="">Any help or thoughts on this subject would be greatly appreciated. </span></div></span><br class="gmail-Apple-interchange-newline"><div class=""><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class="">Aloha,<div class=""><br class=""></div><div class="">Lou Russo</div><div class=""><a href="mailto:lou@spreesolarsystems.com" target="_blank" class="">lou@spreesolarsystems.com</a></div><div class="">808 345 6762</div><div class="">Spree Solar Systems LLC </div><div class="">CT-34322</div><div class=""><br class=""></div></div></div></div></div></div></div></div></div></div></div></div></body></html>