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<p>William,</p>
<p> I recently did a GT with PG&E where they allowed
me to backfeed 18KW into their 208 <i>single</i> phase (L-L-N).
So even though just 2 hots and a neutral were pulled unto this
service panel, no doubt the PG&E source (transformer across
the street) had 3 phase available....yet I was backfeeding just
two of those 3 legs when my backfeed got back over to their
transformer. This is a PTO'ed, operating system. Years ago I was
told they only wanted to see 6KW max out of balance, apparently it
depends.</p>
<p> Jerry made a pretty good point about about biting the
$20K bullet now and get help from the ITC.<br>
</p>
<p>Bill</p>
<pre class="moz-signature" cols="72">Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
<a class="moz-txt-link-abbreviated" href="http://www.frenergy.net">www.frenergy.net</a></pre>
<div class="moz-cite-prefix">On 1/16/2019 1:11 PM, Jerry Shafer
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMUFgmXVr+8yycM9Y0LgRFqR6Km-SRsjTAH4b-bvmxL_OoxvdQ@mail.gmail.com">
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<div>William, Wrenches,</div>
<div>can we assume the utility voltage is 120/208 of so Fronius
has some inverters that do that, if it is 277/480 then SMA can
do that but neither of them are less then 10k, Enphase does
not have a 3 leg inverter just 1/2,2/3/,3/1 leg balance but
you can do that with most any single phase inverter.</div>
<div>We have had several customers that got hit with Xformer
upgrade charges at time of PTO which is a real problem. I
agree that is you go solar that the bill would be close to
zero now that would trigger the 20 k bill to your customer,
better off paying it now and getting FTC while you can.</div>
<div>Jerry<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Jan 16, 2019 at 12:30
PM William Miller <<a href="mailto:william@millersolar.com"
moz-do-not-send="true">william@millersolar.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div class="gmail-m_-1550570081775779963WordSection1">
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif"">Friends:</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif"">I
am engaged in a rather complicated decision process
regarding an AG customer in PG&E territory. The
customer spends a lot of money pumping water and
wishes to offset that cost with installation of a
grid-tied system. His two services are decrepit and
have to be upgraded. There was some question if he
will be required to upgrade from single phase to three
phase given the size of his motor loads. We received
a waiver to allow us to continue with single phase
although I am not sure that is the right decision.</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif"">We
were also informed that the $20,000 cost to upgrade
the single phase feeder to allow bigger services would
be waived because of the potential revenue PG&E
would earn over time. There is a review three years
out and if the revenue meets projections based on
existing loads, the construction credit would remain.
If, however, after three years revenue decreased, the
credit would be rescinded, requiring the customer to
fork over the 20 grand.</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif"">I
was told that if we install solar and zero out the
annual bill, that reduction in billing would trigger
the rescinding of the credit. I want to check that
the utility is interpreting this correctly. Do any of
you esteemed wrenches have any experience in this
area?</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif"">Another
question: If we go three phase and I wish to use
inverters with two hot leads, I know they will work on
three phase, but the back-feed will be imbalanced. I
know we are allowed some amount of imbalance, but I am
not sure how much. Anyone know this answer?</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif"">I
am searching for true three phase inverters in the
less than 10kW range. This would require a connection
to all three phases. I believe Enphase can do this.
Are there any other units you know of?</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif"">Thanks,</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif"">William</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Verdana","sans-serif""> </span></p>
</div>
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