I have connected a 5500 watt(6250w peak) generator to my 3/4hp in-the-well water pump through an EmerGen manual transfer switch.I connect with size 10 -4 conductor wire and NEMA connectors. I measure 220 V at the pump breaker when the pump is off. When the pump switches on the watt meters on each phase of the transfer switch register 2700watts. They remain there for about 15 seconds,the pump doesn't start,and subsequently one or both of the breakers on the transfer switch trips. The transfer switch is rated at 30 amps at 250V. The pump works fine with utility line power.
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Generator to water Pump