ADAD437 wrote:
if transfer switch goes bad it should default to generator therefore you should have power when gen. is running. been there done that.
Not necessarly... the ATS in my unit "Defaults" to generator if it has a choice of shore or gernny.. but if it fails it sticks on shore in most cases (one failure mode stays on "Current source" but the rest go to shore.
Transfer switches come in two main types.. Mine on shore power is "Not energized" that is the solenoids are "off" no current in the coils.. Fire up the genny and about 1 minute later the coils energerize and it transfers.
Another type has two sets of normally open contactors. When shore power comes one set pulls in, Generator pulls in the other.. In some cases neither selects inverter (if it has that option).