Generac Homelink 6852 manual transfer switch on 120V?

[backup]

I'm looking for a transfer switch to power essential loads during an outage. I have a standalone backup battery + inverter with a 120V output. Neutral and ground and bonded, so it can essentially be treated as a N-G bonded generator.

The Generac 6853 30A manual transfer switch looks like it would work well, it switches neutral which I need due to the N-G bond at inverter (also needed because some of the circuits are on AFCI breakers).

It is designed for 240V split phase input, but I'd like to use it with 120V bridged hot input (supplying only 120V circuits). If it was fully manual, it seems like it would work fine. But as far as I can tell, the actual switching is done by a relay. Are the relays 120V or 240V?
I've seen some posts of folks removing the front of the panel to manually switch between Gen and Utility (as shown in the attached photo). It's not clear to me why they were doing this, but it seems it would be required if the relays weren't functioning (maybe b/c wrong voltage?).

So, does anyone know of this will work as I'm proposing?

The best schematics I've found online were posted in the thread below, but I'm not understanding it well enough to know for sure. They also might be with the automatic upgrade unit installed, which I wouldn't want.
https://gentekpower.com/forums/viewtopic.php?t=1300

Generac homelink manual here: https://www.generac.com/generaccorporat ... pdf#page=9

Thanks for the input!

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[Chris]

A 240V transfer switch won't work with 120V input since the transfer coil would be 240V (what you see behind the white cover in that pic). The relay itself would be powered by 12V from a standby generator.

You'd probably be better off to look at a manual transfer switch that's designed for 120V only use. The problem with double tapping a single 120V line to feed a 240V panel, is that if there are any multi-wire branch circuits, you risk a fire on a neutral that's now overloaded with potentially double the rated current...

[backup]

Thanks for the response.

A 240V transfer switch won't work with 120V input since the transfer coil would be 240V (what you see behind the white cover in that pic).

That's what I was worried about.

The relay itself would be powered by 12V from a standby generator.

Not sure I understand this. This isn't an automatic switch with a standby generator. And why would the relay need 12V?

You'd probably be better off to look at a manual transfer switch that's designed for 120V only use. The problem with double tapping a single 120V line to feed a 240V panel, is that if there are any multi-wire branch circuits, you risk a fire on a neutral that's now overloaded with potentially double the rated current...

I haven't found any 120V manual transfer switches that switch neutral. Do you know of any? Reliance sells a "neutral kit" which is just neutral wires and conduit that allow you to run individual neutrals to GFCI breakers, but this doesn't actually switch neutral. I guess this might work if I remove the N-G on the inverter.
Agreed regarding multi-wire branch circuits - I've checked and none of the circuits I want to move are MWBC.