# Same voltage inverter

Is there any reason for not finding an inverter that only converts from DC to AC maintaining the same output voltage, e.g. a 220V DC to 220V AC inverter?

• It is rarely used – Findus Apr 2 at 15:42
• What supply is 220 volts DC - where is it derived? – Andy aka Apr 2 at 15:53

An inverter is similar to a variable frequency drive. The AC is generated by switching the DC bus voltage using pulse-width modulation in a fashion that generates a pseudo-sinewave. To generate a specific AC voltage the DC bus must be at least as high a voltage as the peak of the AC output required. For your 220 V AC output that is $$\ 220 \sqrt 2 = 311 \ \text V \$$. With a 220 V battery the best you could do would be 155 V AC.