[RE-wrenches] Sol-Ark 15K Gen on Grid Terminal (with GTBB)

[Jason Szumlanski]

This guy wants the smart load capability, too.


Jason



On Thu, Jul 3, 2025 at 8:42 AM Jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> It’s got generator input terminals.
> Why not use them for the generator?
>
>
> On Jul 3, 2025, at 5:05 AM, Jason Szumlanski via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> 
> The attached wiring diagram from the manual shows both a generator and
> grid connected to the Sol-Ark Grid input with a transfer switch to select
> between grid and generator.
>
> Question: If you program the inverter for GEN on Grid Input and allow Grid
> Sell, how would the inverter know what the input source is and prevent
> selling to the generator inadvertently?
>
> I suppose if it is an automatic transfer switch and the two wire start is
> called for, the inverter might stop grid selling when calling for the
> generator (but I'm not sure if that's the case). In any case, that's not a
> failsafe solution because the generator could be started and selected
> manually with the transfer switch and the inverter would not know it.
>
> I have someone insisting that Sol-Ark supports this configuration with
> Grid Sell enabled. I can't imagine that is the case. At a minimum, it would
> be bad practice.
>
> In my opinion, the interface should disallow Grid Sell altogether when GEN
> on Grid Input is selected. Maybe it's already doing that internally, but it
> isn't clear at all from the interface or the manual.
>
> Of course, the Off-Grid section of the manual does tell you to not use the
> Grid Sell option.
>
>
> Jason Szumlanski
> Florida Solar Design Group
>
>
> <Screenshot_20250703_063315_Drive.jpg>
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