I hate to break it to you, but the natural solution is to sell one or both of these and buy an inverter generator. Another option is to buy a really big deep cycle battery, a battery charger, and a good pure sine wave inverter. This is basically a UPS without the switching technology. You run the dirty generator power to the battery charger, hook that to the battery, and the inverter cleans up the power. The battery provides some filtering on its own, and it will keep things running while you refuel your generator.
Originally Posted by avi
I already have these two non-inverter generators. is there a way to "clean up" the power?