We do have an SW+ GSM, but little time to delve into it.
Will try to check it out.
It is very basic. Just relays, and PC board traces. All of the smarts are in the Firmware in the SW+ inverters.
It would seem that these would show up on e-bay, at least on occasion.
More later (perhaps). Vic
I have a brand new Xantrex GSM - Generator Start Module for SW Plus for sale I never used it with my SW 4024 inverter now have a Magnum inverter first $100 can have it.