[RE-wrenches] Upgrading old inverters to TL?

[Jason Szumlanski]

Probably not what you want to hear, but microinverters might work depending
on the module.

Jason


On Tue, Mar 31, 2015 at 1:40 PM, August Goers <august at luminalt.com> wrote:

> Hi Wrenches,
>
>
>
> We commonly upgrade old failed out-of-warranty grid tied inverters as part
> of our O&M business. Anyway, we’ve been using standard transformer based
> isolated inverters just like the good old days. However, as the industry
> progresses it seems like transformer based inverters are going the way of
> the dodo. Does anyone know of a code compliant way to install a
> transformerless ungrounded inverter on an old PV array with USE-2 wire? The
> problem is that the modules from just a few years ago all or mostly had
> USE-2 and I can’t find a way to meet NEC 690.35(D)(3).
>
>
>
> Best,
>
>
>
> August
>
>
>
> August Goers
>
> Luminalt Energy Corporation
>
> o:415.641.4000
>
> august at luminalt.com
>
>
>
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