[RE-wrenches] Old Trace SW inverter connected to the grid.

Chad Waits chadwaits at netzerosolar.net
Mon Dec 19 07:27:52 PST 2022


I thought the SW needed a Grid Tie Interface (GTI)
<https://www.altestore.com/store/media/pdfs/xantrex/Grid%20Tie%20Interface%20(GTI)%20Data%20Sheet.pdf>
to keep current from leaking out to the grid even if you didn;t want to
sell to them...

Chad Waits
President - Net Zero Solar
945 W. Silverlake, Tucson, AZ 85713
Cell: (520) 270-4873



On Mon, Dec 19, 2022 at 8:21 AM David Palumbo via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Wrenches,
>
>
>
> I have been retired from doing solar installs for 10 years now and I am
> reaching out for help as to recommending a solution to an old
> do-it-yourself customers question.
>
> His solar system that was formerly off-grid and is now using grid power
> instead of a back up generator.
>
> He had/has no intention of doing a net-metered system. Just trying to
> reduce dependance on a fossil fuel genset during our mostly sunless Vermont
> winters.
>
>
>
> He says that he brought in power a few years ago to run their expanding
> maple sugaring operation located next to their house. At that time they ran
> a 115Vac circuit (grid power) over to their house and connected grid power
> into AC Hot In terminal #! in their Trace SW 2512. This is correct as I see
> terminal #2 is labeled for generator power.
>
> He has the Trace programmed for float mode  not sell mode.
>
>
>
> Their local utility was working on the line nearby on the main road and
> noticed a small amount of current flowing into the grid and figured out
> where it was coming from. The utility did not immediately shut him down.
> Just told him to correct the problem. He is asking me for advice.
>
>
>
> My first inclination is to separate the grid power completely from the
> inverter power and to feed both power sources into a double pole double
> throw transfer switch. What other options should be considered.
>
>
>
> Thanks in advance and happy holidays,
>
>
>
> Dave Palumbo
>
> Formerly > Independent Power & Light
>
> Hyde Park, VT
>
> 802-371-8678 voice or text
>
>
>
>
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