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Hi Ash,<br><br>
Long time no see. <br><br>
I would consider replacing the entire array. The new high wattage, low
cost modules would allow you to match the existing inverter's voltage
with new modules at a surprisingly reasonable price. The customer may be
amazed at how cheap they are, especially since he bought is array 6 years
ago. Especially if you can use existing racking, this could be an
easy solution. Maybe he can sell the old modules on Ebay. <br><br>
Cheers,<br><br>
Drake <br><br>
Drake Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
740-448-7328<br>
</i><a href="http://athens-electric.com/">http://athens-electric.com/</a>
<br><br>
At 03:47 PM 6/21/2016, you wrote:<br>
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Content-Type: multipart/alternative;<br>
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<br>
Good day RE Wrench crew,<br>
I’ve got a client whom installed a 2kW array with a 3kW SunnyBoy inverter
a number of years back. Due to the age of the system I assume it is
single MPPT. The client oversized his inverter in the hopes of using it
for this future expansion (and unfortunately his installer went along
with it). The original modules were 12 SolarWorld 175’s I believe, and we
would be looking at adding SolarWorld 280’s more than likely. To me it is
clear that this is poor design practice and not something I am willing to
do. My recommendation is a micro-inverter system that we tie in w/his
existing using an AC Combiner. But the client wants to know exactly why
we don’t want to just add a second string of 12 SolarWorld 280’s to his 6
year old SunnyBoy inverter. <br>
Can someone please give me a technical reason why mixed modules on a
string inverter is “poor design practice”?<br>
The more technical and dry an explanation, the better ;) <br>
If you can’t convince them, bore them to tears with the details. <br>
<br>
Ash Bowersock<br>
Senior System Designer<br>
<a href="http://www.rgsenergy.com/">
<img src="http://rgsenergy.com/images/new_rgs_energy-cpbs.png" width=349 height=83 alt="RGS Energy">
</a><br>
833 W. South Boulder Road | Louisville, CO 80027<br>
tel 303.222.8387<br>
<b><a href="http://www.rgsenergy.com/">RGSEnergy.com</a><br>
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