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

[Steve Higgins]

It sounds to me like Sell Mode is Enabled without the GTI...  But it's been
a long time since I played with an SW and GTI...

Steve Higgins


On Mon, Dec 19, 2022 at 7:29 AM Chad Waits via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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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