cmperry wrote:So, has there been any guidance on the use of an inverter generator with our stoves. For one reason or another some people will want to run an inverter. So far I have heard don't use,oversize,has run fine. For me anyway this was the whole point of posting was to make people with inverters aware that they may have problems. Something concrete would be helpful like a DO NOT USE from LL,or "a 5000 watt inverter is needed" or some other solid info. If this has been given somewhere I apologize for missing it. Personally I'm going regular generator for my stove but for some a inverter might be needed or just preferred because of noise,fuel usage,etc....
I don't think that is a rational request, inverter generators are changing every year and the better ones improving every year or so. Some degrade as they are cost reduced WITHOUT model number changes! How can any manufacturer test every inverter generator and track every design change to them?
The generator manufacturers don't publish data that helps at all regarding switching or out of phase motors ( slipping). Generator manufactures can't spec for every possible usage any more than LL can certify every random generator.
The main issue is a "Watt" means little for any application other than resistive loads. Look at any UPS or computer power supply have a wattage and a much higher VA spec. For resistive loads, Voltage multiplied by Amperage (VA) equals Watts. The devices I mentioned need to be wired for the higher VA current rating since the current is VA divided by the applied voltage. Heck, a low loss inductor or capacitor might only use a few watts yet trip a 20A circuit breaker. Not a practical application but true.
For pure inductive or capacitive loads, the above math determines the peak current. But these devices do not have sine wave current waveform. They draw higher peak currents that VA math would suggest. Variable speed motors also draw more peak current than simple math would predict.
Eventually pure better sine wave inverters will probably handle any load a good conventional generator will and likely narrow the dramatic price premium they now command.
For now, the only guidance can be "try an oversized pure sine wave unit from a place you can return it to or grossly oversize".