On old days that was solved by a Y to delta switch. Starting on Y with a lower current and switched to delta after get some speed. Assuming the motor is tri-phased (as it should be at powers larger than 9KW). Vasile On 9/16/08, Bob Blick wrote: > Hi Carl, > > The starting load of the air conditioner, 83 Amps, is higher than the > rating of the generator. > > So it doesn't surprise me that the voltage dips when the A/C starts. > > If your generator is rated for a 300% temporary overload, that does not > mean it will be producing rated voltage and frequency at that time. > > Boosting the engine speed in anticipation of the air conditioner > starting is asking for trouble, please don't do it. You'll be stressing > your whole system even more. > > The solutions I suggest are this: > > If your HVAC contractor has a factory-approved kit that solves the > problem, do that. Or else: > > Get a bigger generator. > > Or just get a few small UPS units for the critical devices you have in > your house. > > Cheerful regards, > > Bob > > > > > On Tue, 16 Sep 2008 12:38:04 -0400, "Carl Denk" said: > > > >> We have a 12.5 KW standby generator, and while online and the house air > > >> conditioner starts up, there is a brief voltage drop with lights > > >> dimming, but not enough to have to reset clocks, while the carburetted > > >> gasoline engine's mechanical governor opens the throttle to the demand > > >> of the new load. Otherwise the generator handles the load fine. Looking > > >> for a soft start controller or other way to flatten the peak. My HVAC > > >> contractor indicates there is a kit available that includes a capacitor, > > >> > > >> and he's checking that out with the manufacturer. Apparently the device > > >> acts like the capacitor on a capacitor start motor. > > >> > > >> Here's the data on the exterior unit: > > >> Model: Rheem RAML-036JAZ > > >> Voltage: 220 VAC 60 hertz > > >> Breaker: 30 amp > > >> RLA: 15.4 AMP (running amperage) > > >> LRA: 83 AMP (locked rotor amperage) > > >> Scroll type compressor > > >> > > >> I am able to build a electronic device, familiar with PIC's, not that > > >> great with design though, in particular AC. > > -- > http://www.fastmail.fm - Or how I learned to stop worrying and > love email again > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist