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

Thu Jul 3 13:13:57 PDT 2025

Sol-Ark strongly recommends only using a line side generator under inverter 2 wire control and with AC coupled inverters off, per several webinars.
Best regards,
Lloyd

I’m lLlCOGet Outlook fo<https://aka.ms/o0ukef>
________________________________
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Jason Szumlanski via RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Thursday, July 3, 2025 3:10:07 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Cc: Jason Szumlanski <jason at floridasolardesigngroup.com>
Subject: Re: [RE-wrenches] Sol-Ark 15K Gen on Grid Terminal (with GTBB)

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<mailto: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<mailto: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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