I removed the generator L1 and L2 wires from the transfer switch and connected them to the Sol-Ark.
I ran 4/0 XHHW from the ATS gen lugs to the Load output of the Sol-Ark, and to the Neutral block.
I ran a 4 AWG copper from the ATS ground lug to the Sol-Ark ground lug.
I used Ilsco KUP-L-Taps to tap my 200A Service feeds ahead of my ATS and after my main breaker, and connected them to the Sol-Ark Grid port.
I Disconnected the Common, +12 and transfer wires from the transfer switch and the generator. I repurposed 2 of them for two-wire start.
I left the N1, N2 and T1 wires in tact.
Inside the transfer switch there are solenoid coils that energize to move the switch. I disconnected one of the spade connectors from each of the coils and taped it off.
Doing this has several advantages:
- I converted my ATS to a manual bypass that can completely bypass the Sol-Ark if needed. Even though the Sol-Ark is bypassed it still has power from the grid.
- I didn't have to wire separate branch circuits for the generator charger and heater circuits.
- If I ever want to remove the solar inverter I can put the original wiring back EXACTLY as it was before with very little effort.
- Simplified wiring of the Sol-Ark.