<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">I have a buddy in tech support at Fortress.<div class=""><br class=""></div><div class="">I asked him and he said that elevated absorb volts above 55.2 could cause this situation. </div><div class="">And then the power cycle would reboot the BMS.</div><div class=""><br class=""></div><div class="">I am presuming its open loop, and the fact you mentioned that there was more PV and then the shut down sure might be connected. </div><div class="">You might check the charge voltages/time to make sure they are correct and I can’t remember if the classic has battery sense wire connections. </div><div class=""><br class=""></div><div class="">jay</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Aug 27, 2024, at 2:51 PM, Ray Walters via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" class="">re-wrenches@lists.re-wrenches.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class=""><p class="">The SPD was on one of the PV inputs before it came into the
house. There were two Classics, each fed with its own PV input
and SPD. It actually caused an underground splice to fail (high
resistance) which I replaced the splice and restored full voltage,
and both Classics were working fine. Just seems unlikely ( but
not impossible) that the surge would make it past the Classic
without damage, but then damage the Fortress BMS in an otherwise
imperceptible manner. That is our current best theory at the
moment though. I added an SPD on the 48 v buss, before this
latest total shutdown. <br class="">
</p><p class="">Ray Walters<br class="">
</p>
<div class="moz-cite-prefix">On 8/27/2024 2:35 PM, Dave Angelini
Offgrid Solar via RE-wrenches wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:73b67fe1b3d521cc295be424ab132127@sti.net" class="">
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<div id="signature" class="">When I have had someone lose an SPD (I assume
it was on DC buss) there is often latent damage (shows up later)
to many of the devices. In a Hi Rel mode, it is recommended to
replace it all. Most offgrid is not that critical but try
telling that to someone with rotten food.</div>
<div class=""> </div>
<div class="">The freezers and reefers are often full of spoils that smells
never go away. YUK !<br class="">
<pre class=""> </pre>
<pre class=""><strong class=""><span style="font-size: small;" class="">Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" rel="noopener" moz-do-not-send="true" class=""> </a><a style="color: blue; font-size: 11px; font-family: 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif; font-weight: 400; background-color: #ffffff;" href="https://offgridsolar1.com/" rel="noopener noreferrer" moz-do-not-send="true" class=""><span style="font-size: 12pt;" class="">https://offgridsolar1.com/</span></a><a href="http://members.sti.net/offgridsolar/" rel="noopener" moz-do-not-send="true" class=""> </a>
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text 209 813 0060</span></strong></pre>
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</p><p id="reply-intro" class="">On 2024-08-27 1:02 pm, Ray Walters via
RE-wrenches wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0" class="">
<div class="pre" style="margin: 0; padding: 0; font-family: monospace">Greetings
All;<br class="">
<br class="">
I have Fortress Battery installation with a pair of E Vault
batteries set up in a Master/ Slave arrangement. Its been
working fine for over a year, but the customer just had a
complete shutdown of the batteries which left multiple
freezers, and refrigerator with rotting food. When he
rebooted the batteries by turning on/off the main breaker on
each, they both come up and showed 100% SOC on the Master, and
98% on the other. There were no fault codes. I just
recently installed a larger PV array, and so the system has
been reaching full charge every morning.<br class="">
<br class="">
I have multiple calls in to Fortress, but not hearing anything
back from them at all. We did have a lightning surge event a
few months ago, that damaged a Midnite SPD (first ever for
me), and took out the control board on the generator. One VFX
inverter has an LED out, but we only use two inverters of the
Quad stack, so I just switched to another inverter. All other
equipment appeared fine: Midnite controllers, rest of the
Outback VFX quad stack, and never any issues seen with the
Fortress batteries.<br class="">
<br class="">
The other odd thing, is since he rebooted the batteries, the
system is working fine, and recharging to 100% by 9:30 am as
before. Is it possible the Fortress BMS were damaged and
are now having an intermittent shutdown issue? I did ask him
to temporarily disconnect the comms between batteries, in case
it is a bad BMS on one, it will isolate it from the other.<br class="">
<br class="">
This is a tough one to figure out, since it hasn't happened
again, and there are no fault codes. The Mate 3 shows a low
frequency AC code, but that's usually just from the generator
shutting down. Any help, ideas, experiences, would be
greatly appreciated.<br class="">
<br class="">
Thanks,<br class="">
<br class="">
Ray Walters<br class="">
Remote Solar<br class="">
<br class="">
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