I am looking at VE Autotransformer for load balancing two MultiPlus inverters running in split-phase togeather.
The two phase legs with usually be in balance, with the exception of a 120v microwave, which would pull 1600w from one leg, or right now, one inverter.
Before I go adding an auto transformer to balance out essentially that one load, I am interested in knowing what losses I should expect from the Autotransformer. I would hope that when the legs are in balance, the efficiency would be close to 100% since the Autotransformer wouldn't be doing any work. But if say, the whole load was drawn from one leg... Essentially as if it were just being used to step down 240v to 120v... Roughly what percentage of the current drawn from the power source will be lost in heat? Rough guesses or estimates are more than welcome.