[RE-wrenches] Add-On to DGT, string inverter, w/Different Modules on 2nd string

Jerry Shafer jerrysgarage01 at gmail.com
Tue Jun 21 12:56:49 PDT 2016


Wrenches
Unless the VOC and VMP, are the same it will mainly only pull from the
higher voltage side array, this as i have seen personally can cause damage
to the JB bypass diodes on the modules due to prolong push on them because
someone else did what you are asking about. He has another option and that
is to buy a sma 3 tl-22 and sell off the 3000us or find some SW 17's
Jerry
On Jun 21, 2016 9:48 AM, "Ash Bowersock" <Ash.Bowersock at rgsenergy.com>
wrote:

> 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
>
> [image: RGS Energy] <http://www.rgsenergy.com/>
>
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> tel 303.222.8387
>
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