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<font size=3>Keith:<br><br>
No matter how you slice it, every breaker panel and every conductor in
the feeder from the inverter to the meter must meet the 120% rule.
You can not dedicate one panel as an "AC Combiner" and exceed
the 120% rating on that panel only. It does not matter if the
source is one inverter or 10 inverters. You either meet the 120%
requirement from section (B) or you supply a supply side tap as allowed
in (A).<br><br>
William Miller<br><br>
<br>
At 02:40 PM 2/9/2009, you wrote:<br>
<blockquote type=cite class=cite cite>Hello<br><br>
With the growth of the solar industry coupled with the generous
incentives now offered on fed part of the equation, we are seeing some
trends here and wondering what the approach has been in other areas. What
kind of feedback are you receiving from the AHJ?<br><br>
There are some integrators who now are installing "systems"
meaning, multiple small inverters that are married to smaller arrays as
opposed to one large array with one large inverter. <br><br>
So, it is quite conceivable to have, for example, 3- 3000 W SMA inverters
on a customers home. So, the point of connection issues arise. When you
look at 690.64B, it speaks to the 120% of the busbar rating.<br><br>
What are folks doing in other areas, for this above example to address
the mechanical/electrical challenges associated with this situation, when
if you had 1- 200 amp residential service? There is alot of discussion,
like installing a 125 amp rated subpanel; interuppting the feeder from
the electric service and installing a 225 amp panel with a higher rated
buss (hard to find or custom made thru Cutler Hammer or others)
etc.<br><br>
We can also see a trend using the enphase products as well, but not as
much pronounced. It could be conceivable for a client to want to build
their system up over a few years and have 15, 175 watt panels on a
circuit (2P15 amp) and grow the system up to lets say, 45, 175 watt
panels (3-2P15 amp). Same situation, different inverter manufacturer. My
sense is this trend will continue for the forseeable future, and alot of
wrenches will find orphaned systems out there and we should look at ways
to address point of connection issues that are bound to present
themselves.<br><br>
Thanks<br><br>
Keith</blockquote>
<x-sigsep><p></x-sigsep>
<u>Please note new e-mail address and domain:<br><br>
</u>William Miller <br>
Miller Solar<br>
Voice :805-438-5600 Fax:
805-438-4607<x-tab> </x-tab><br>
email: william@millersolar.com<br>
<a href="http://millersolar.com/" eudora="autourl">http://millersolar.com<br>
</a>License No. C-10-773985<br>
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