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<p>Midnite has some string level and module level 690.12 disconnects
that wire in like an optimizer or micro inverter, so those should
be able to meet the 2019 requirements. However beware: they as
of yet still don't have a reasonable disconnect system to
disconnect the charge controller which has capacitors that back
feed the PV line for up to 90 seconds. They have a DC GFI breaker
with remote trip capability but it takes 4 spaces, so with
multiple charge controllers it turns into a wiring mess really
fast. <br>
</p>
<p>I actually wired in some 60 amp rated diodes on one system to get
it to pass inspection; what a joke, going back to 1980s equipment
to pass 2017 code. 690.12 is an absolute nightmare for small
off grid. There really should be some exemptions for small arrays
(under 3 kW) and under 100 vdc. Fire fighters are not going to
get there till the structure is down anyway, Response times are
up to an hour for remote locations with volunteer fire
departments. Its not like in town at all; no one is going to go
on the roof on an off grid fire.</p>
<p>On the flip side, there are real dangers created by nuisance
tripping of 690.12 equipment. Again, on grid it's a mere
inconvenience, but off grid it could mean spoiled food, frozen
water lines, shut down heating systems in subzero temperatures,
and for the elderly: loss of their breathing machines. I've
already had a 74 year old customer climbing on their roof multiple
times to reset the Rapid shutdown equipment after nuisance trips.
Are we going to wait until we get someone killed in the name of
"Safety" before we fix this? <br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 7/6/18 9:55 AM, cwarfel wrote:<br>
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<p><font face="Verdana">I <font face="Verdana">am wondering about
the <font face="Verdana">experience installers have with a
DC coupled multimode <font face="Verdana">system design
that w<font face="Verdana">ill comply </font></font></font></font></font><font
face="Verdana"><font face="Verdana"><font face="Verdana"><font
face="Verdana"><font face="Verdana"><font face="Verdana"><font
face="Verdana"><font face="Verdana"><font
face="Verdana"><font face="Verdana"><font
face="Verdana">after <font face="Verdana">January
1 </font></font></font></font></font></font></font>with
what <font face="Verdana">I feel is t<font
face="Verdana">he biggest mistake/poorly guided
part of NEC 201<font face="Verdana">7 </font>690,
and t<font face="Verdana">hat is </font></font></font>690.<font
face="Verdana">12<font face="Verdana">. <font
face="Verdana">We are install<font
face="Verdana">ing two Ou<font face="Verdana">tback
<font face="Verdana">s<font face="Verdana">ystems
with the rem<font face="Verdana">ote c<font
face="Verdana">ontrolle<font
face="Verdana">d combiner and even
that w<font face="Verdana">on't
comply after January 1 unless we
<font face="Verdana">parallel
more subarrays (There's safety
for you, <font face="Verdana">lower
voltage<font face="Verdana">-hi<font
face="Verdana">gher ampe<font
face="Verdana">rage!).
Thanks for any
insight. <br>
</font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></p>
<p><font face="Verdana"><font face="Verdana"><font face="Verdana"><font
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face="Verdana">Chris</font><br>
</font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></p>
<p><font face="Verdana"><font face="Verdana"><font face="Verdana"><font
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<p><font face="Verdana"><font face="Verdana"><font face="Verdana"><font
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<p><br>
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<font size="-1"> Christopher Warfel, PE<br>
ENTECH Engineering, Inc.<br>
PO Box 871, Block Island, RI 02807<br>
(401)466-8978</font><br>
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