Hi Ash,
Long time no see.
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.
Cheers,
Drake
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
<http://athens-electric.com/>http://athens-electric.com/
At 03:47 PM 6/21/2016, you wrote:
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Good day RE Wrench crew,
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.
Can someone please give me a technical reason why mixed modules on a
string inverter is "poor design practice"?
The more technical and dry an explanation, the better ;)
If you can't convince them, bore them to tears with the details.
Ash Bowersock
Senior System Designer
<http://www.rgsenergy.com/>
RGS Energy
833 W. South Boulder Road | Louisville, CO 80027
tel 303.222.8387
<http://www.rgsenergy.com/>RGSEnergy.com
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