[RE-wrenches] Trace SW4024 feeding back to grid

[Kent]

David,


The SW4024 inverter has a SELL mode that allows power to flow back to 
the grid from the AC1 terminals. Make sure that the SELL mode is not 
selected; that may take of the problem. If not, connect the utility 
power to the AC2 terminals, it shouldn't be possible for the SW inverter 
to backfeed power to the the AC2 terminals.


Kent Osterberg

Blue Mountain Solar



On 1/10/2026 1:12 PM, David Palumbo via RE-wrenches wrote:
> Wrench,
>
> An off-grid installation of mine from many years ago has is now using 
> grid power instead of a generator. The utility is telling the 
> homeowner that they are going to disconnect him because his house is 
> back feeding 1 amp into their grid power.
>
> I've been retired for many years now and did not do any of the work to 
> connect the utility power to his Trace SW4024 inverter/charger. The 
> utility power became available when his son brought in utility power 
> for his maple sugaring operation in the neighborhood, and the father 
> connected power to his house to replace his fossil fueled generator 
> for additional charging into his battery bank. They do not have a grid 
> interconnect sellback agreement with the utility.
>
> I have no experience with this, but I'm assuming that the utility grid 
> is seeing power from its input connection to his Trace SW4024. Does 
> that sound right? If so, is there a simple solution to fix this 
> problem while continuing to use the grid power through his SW inverter?
>
> Thanks for any advice that may help.
>
> David Palumbo
> Hyde Park, VT
>
>
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