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Kohler and Generac have the majority of the market.
The automatic transfer switches are generally deigned to work with a specific companies whole house generator. I would not suggest mixing and matching.
Most of the ATS units have a solenoid circuit. If the circuit sees power on the Utility side, it will switch to the Utility system. If the utility power is off AND the ATS sees power from the generator, it will switch to the generator.
By APC, are you meaning a battery based system?
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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