map40 wrote:
I have connected any of the following in any configuration:
2 3500 Predator
1 2200 Predator
2 2200 Roybi
3 different regular inverters
They all get in sync when you connect them. Even when running under load. I could start both ACs in my 36 feet class A with a 3500 and a 2200 and then move the 2200 out for a few minutes, bring another one and connect it later, and the load would automatically balance between the two units, according to capacity. Don't ask me how, I don't know.
As a matter of fact, once for a Relay for Life event we had 3 RVs (1 A and 2 Cs) and 4 Inverter generators. We bridged them ALL and connected the RVs to them (Gen 1 - C - Gen 2 - A - Gen 3 - C - Gen 4). We were able to shut down one at a time, refuel, let it rest and restart and move to the next without a glitch.
Of course, we had to make our own parallel adapters, which took all but 30 minutes.
Real life trumps all the other speculation.
In my Air Force days, we routinely paralleled two 50kw diesel generators. Start one generator and put it on line. Start the second generator and watch a neon lamp while adjusting the rpm. When the lamp was on, the generators where out of phase. Adjust rpm so that the lamp would slowly turn off indicating that they were in phase then put the second generator on line. Once paralleled they will not go out of phase. Both generators had an old school mechanical governor.
You can not adjust the frequency of an inverter generator so when connecting two or more generators, the synchronization must happen almost instantly. The typical paralleling cord is just two wires so there is no separate sync signal.
