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Auto transfer switches are very simple relays and easy to change if you can get to them and if they are not built into the inverter/charger(s). My suggestion would be to separate the transfer function from the power protection function by using a power pole plug in unit for the latter and any auto transfer switch for the former. If you want to add soft start for all you induction loads then uses the Active Start plug in unit that also has all the power protection functions. If you don’t care about soft start for the induction loads then use some other brand of power protection plug in units.
Jerry