Understand what you are saying. Say a solenoid on the generator's 
throttle, maybe better a stepper motor, The generator is managed by a 
TRI-PLC controller which has ability to control a stepper, relays, and 
timers
1: Air conditioning thermostat signals request to PLC
2: Increase the generator speed
3: time delay, then start compressor
4: time delay, generator speed to normal

Although appears possible, and with a lot of learning curve for me, at 
this point I prefer looking at generator connection configuration and 
the soft start avenue. Thanks for the ideas. :)

Martin wrote:
> Carl Denk wrote:
>
>   
>> Generator can handle 40 amp resistance heat in addition to misc. house 
>> load, so I don't think it's generator being weak with 30 amp protected 
>> compressor load. It's the few seconds that it takes the mechanical 
>> engine governor to  open the throttle more and the engine to respond. 
>> Other loads like 1/2 hp. pump with or without capacitor stating can 
>> start stop without issues.
>>     
>
>
> The generator takes a fixed amount of time to increase it's output as
> you've guessed. My guess is that the A/C motor either has a low rotor
> resistance so it's higher efficiency, but requires a huge startup
> current, or it's a more typical motor but the compressor represents a
> very large load upon startup at zero speed. So you need a way to reduce
> the startup current or increase the immediately available current.
>
> Perhaps you could roll together a controller that would increase the
> generator RPM a little bit - half a second before the compressor is
> triggered? It seems like that would be the simplest way to do it. You
> would get a voltage surge but perhaps that's a bit better than a big
> sag. I would think you could tune the delay time to have a minimal surge.
>
> The harder way is to mechanically modify the generator or [hardest] is
> to do something to the A/C compressor.
>
> -
> Martin
>   
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