Stim wrote:
msturtz wrote:
STBRetired wrote:
My Onan 5500 will start both my rooftop 13.5K airs at the same time. It does not seem happy about it, but it will start both units. I usually try to avoid that situation.
My QD6000 is an inverter generator. This type has an automatic power protection system that cuts power from the generator if the instantaneous load is too high. This protects the generator from a too high a load and the RV components from voltage sags. A non-inverter generator such as the gasoline models do not have the inverter capability and lack the instantaneous power overload protection. Instead, they rely on a breaker which takes a while to trip which can allow a large drop in voltage and a major load on the generator engine. What actually happens is the speed dramatically drops. Non-inverter generators generally run at 3600 RPM and the frequency of the output is directly tied to the RPM of the generator. the problem of a large load is the voltage sags due to the load and at the same time the RPM of the generator slows down dropping the frequency from 60 HZ to some other frequency. None of these things is good for the generator or the motor running the generator.
The 5500 Marquis is an 1800 RPM generator. When both A/Cs try to start at the same time you can hear that it is working hard but the voltage/frequency don't dip enough to trip out the Progressive Dynamics EMS.
