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<p>My experience has bee that all SOC meters can drift off over
time. Best I can figure is that they don't reset at full, or do
reset when the battery is not fully charged. This coupled with an
inability to account for temperature variation and differences in
discharge rates, can also contribute to inaccuracy. Thus, my
solution has been to not depend on auto starting the generator.
The smartest control is the user themselves, who can look at the
weather, look at their usage, time of day, SG of the batteries,
voltage, etc. and better decide when to start the generator.
Their batteries and generator last longer, and they spend $1000s
less in propane over the life of the system. <br>
</p>
<p>For folks that insist on auto start, they better get ready for
big fuel bills, generator replacement, and an overall less
reliable system, since their is not human management of the
system. A seasoned off grid customer is always smarter than any
auto start system. That being said, the advent of batteries with
their own BMS systems that can communicate with the rest of the
system may make auto start a more viable and less costly option in
the future<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 8/18/18 7:24 AM, Tump wrote:<br>
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<blockquote type="cite"
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Yep its is terrible! Spoke w/ a former member of their (OB)\u2019s tech
support and was told that the counting of amp hours both up &
down drifts so you have to recalibrate monthly.
<div class="">This IS something OB is aware of and has no interest
in addressing. Thoughts\u2026. remove and when you find a device that
I am able to install and get accurate info on multiple shunts to
trigger gen start let me know.T <br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Aug 17, 2018, at 3:09 PM, Lou Russo <<a
href="mailto:lou@spreesolarsystems.com" class=""
moz-do-not-send="true">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">
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<div class="">Aloha,
<div class=""><br class="">
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