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<p>I have both controllers set to the Fortress recommended absorb
settings of 54.4 vdc for 2 hrs. Its always possible that there
was voltage over swing or something. I did check that the voltage
on the controllers was within a0.1 vdc of the battery voltage at
the Fortresses. I'm now using a pair of Midnite Hampton Bay
Controllers. They're rated to 90 amps, but I set them down to 85
A output, just to provide some head room. I don't mind the very
occasional clipping. The array is two strings of Jinko 425s, 10
per series string, so 4250 w per controller. <br>
</p>
<p>I wonder if the voltage that causes trouble for Fortress might
have changed due to the possible lightning surge?<br>
</p>
<p>Ray<br>
</p>
<div class="moz-cite-prefix">On 8/27/2024 3:46 PM, jay wrote:<br>
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cite="mid:8874459D-456F-4B57-AD14-281425B0530E@gmail.com">
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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>
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</div>
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<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="moz-txt-link-freetext" moz-do-not-send="true">re-wrenches@lists.re-wrenches.org</a>>
wrote:</div>
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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="">
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8" class="">
<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"
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moz-do-not-send="true" class=""> </a><a
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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>
e-mail <a href="mailto:offgridsolar@sti.net" moz-do-not-send="true"
class="moz-txt-link-freetext">offgridsolar@sti.net</a>
text 209 813 0060</span></strong></pre>
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<p class=""><br class="">
</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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