It is possible, Reminds me of a tale by an Old Timer of his experience on an English air field. He wanted to hook up several generators in parallel so knowing a little bit about electricity he set up switches to do the job. When he threw the switches with the generators all running, they all stopped instantly and several laid over on their sides. Then he learned about synchronization.
There are fancy synchronizing meters, always backed up by a couple light bulbs. Two 120 volt lamps in series across the open switch indicates by the lamp brightness how much the two circuits are out of phase. At the worst point there is 240 volts across the open switch so it takes the two lamps (240 volt lamps being uncommon, but possible). The operational trick is to adjust the speed of one of the generators to slow the brightness changes to ten or more seconds per light brightness cycle, then pick the middle of the dark period for closing the switch. If you miss zero voltage difference, there will be a grunt from both machines and you might have to stand one or both back up if you miss by too much.
Then you adjust the throttle on the dependent generator to get the two generators to share the load. As the load varies, the load sharing will depend on the quality of the individual voltage regulators and engine governors.
The inverter based generators require a control cable between them to do the phasing, they won't just parallel at the AC output.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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