I rewound mine 2- 1000 watt inverter transformer secondaries today. Did the trick nicely, peak voltage range is lowered just enough, I think. I haven't put the 120 turns of 1/2" heat shrink mylar strip around it...that's a PITA and I'm keeping my options open.
I'm going to do a jury rig hookup in my battery bank shed so I can test the well pump, which has it's controller/starter there. The well pump has a wicked surge current, about 3x running current. I'll have to see if the Antek 1000 watt transformers are up to it.
The final hookup will have the transformers in a steel box in a far corner so that when I have to do some troubleshooting I won't get immediately incapacitated. 6 feet makes quite a difference when the field is falling off with the cube of the distance thanks to the use of toroids.
I had a good chuckle at myself this AM. Last night I thought I could "tighten up" the RMS voltage regulation and would take more samples of the recitified and scaled down to 4V peak AC waveform. On closer inspection this morning, I found that the ATMega328P (Arduino Uno Processor) is so overtaxed that it's a freaking miracle that with 128 usec between samples that my real time RMS voltage computation works at all. No way it's sampling right on time, it's more like ''semi-random". The A/D takes 100 usec per sample, and the poor little AVR is timer- interrupting 19 times per 16.67 milliseconds. Some of those are time critical 45usec apart as I'm doing some H-bridge hardware functions in software. 32 bit integer math is tough on an 8 bit processor. I can't use timer interrupts or A/D interrupts since the main 16 bit timer routine is too time critical. It does warrant some investigation- I can imagine how it works as well as it does.
I can live with +-2 volt regulation under load, and +5V no load. If I was planning on developing this further , with features such as variable frequency and/or 3 phase options I'd need a lot more of a processor.
I like the looks of the Arduino IDE compatible Teensy LC. It's 32 bit, 48Mhz, fast 12bit A/Ds, much more ram, timers, etc. The power consumption is shockingly low if the data I found is to be believed.