Yamaha Generator question

time2roll wrote:
Voltage does sag a bit toward maximum output on these generators.

This is the likely answer and a good voltage measurement is the only way to know for sure. The eu2000i voltage goes down to about 110 when it's heavily loaded. If your shore power is a solid 120 volts or higher, you'll see and hear the difference. It's easy to mistakenly think there aren't any other loads on the generator when there really are. Fridge and converter are the common culprits. A 1000 watt microwave pulls close to the rated load of a 2000 VA generator. If there are any other AC loads, high ambient temperature, or high altitude involved, an additional load will push the generator close to or over it's shutdown threshold. When the generator is heavily loaded, the only thing the eco switch will do is enhance the probability of the load device starting up. Once it's running, the eco switch does nothing.