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Sometimes Munro focuses on minor technical data and miss the mountain:

Two out of three ain't bad:

• Wye motor performance
• Delta motor performance
• Missed - step up/down Wye, power transformer
  • Driving one Wye leg doubles the voltage on the other two.
  • Driving two Wye legs halves the voltage on the other.
  • Power is limited by what the motor can handle.
  • Most 800-to-400 VAC converters limit the charging power . . . inefficient and expensive.

Regardless, here is the video:


Motor performance is nice, effectively a two-stage 'tranformation' but the built-in voltage doubling is the real gem. I have long thought about a home, fast DC charger, but the cost of a 40 A , 240 VAC transformer put me off. But if I can get a salvaged KIA 9 or IONIQ 5 motor, problem solved for a fraction of the cost.

Today, my NEMA 14-15 circuit, limited to 40 A at 240 VAC, can provide 9.6 kW. But both of...