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Marco,<br>
<br>
Enphase has a white paper on this topic that seems consistent with
observations. The results depend on the roof and the location. But
even on a 12:12 roof in Denver they compute less than 0.6% annual loss
with new clean 235-watt modules. I've looked for clipping events on
systems with Sharp 235-watt modules that I've installed on 4:12 roofs
and haven't seen much - rarely are they even near 199 watts for a few
minutes. Obviously it'll be more significant with larger modules like
the SW 245, but I doubt that occasional clipping that amounts to less
than 1% of the possible annual output should be characterized as
wasting the customer's money. That much can be lost in selecting a
different inverter.<br>
<br>
I suspect and hope that a larger inverter is in the works. But in the
mean time I see putting 245-watt modules on the 190-watt inverters as
working the inverter hard. Would you hesitate to put 2400 watts of PV
modules on a 2-kW inverter? <br>
<br>
Kent Osterberg<br>
Blue Mountain Solar, Inc.<br>
<br>
<br>
Marco Mangelsdorf wrote:
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<p class="MsoNormal">To those of you installing Enphases.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Other than their 210 only working with Sanyo and
SunPower
modules, the vast majority of other mods only work with the Enphase 190.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Question: what’s the max size module that you’re
comfortable using with the Enphase 190?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In there here parts I’m seeing competitors
pairing the
Enphase 190 with modules in the 230+ watt range. Some are even pairing
the 190 with the SolarWorld 245. Talk about wasting the customer’s
money….<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This strikes me as a bad design that essentially
has the
homeowner throwing away some of his/her money on unused PV horsepower.
Here in the tropics, where the edge-of-cloud effect can be seen on a
regular
basis, I see DC nameplate AND higher coming out on the AC side of my
systems.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m wondering where others are on this question
of
oversizing.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">marco<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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