Inverter

Decently well documented inverter system, 2 kW, using transformers:

• Disadvantage: about 70-80% efficient; appears that non-solid state inverters are less efficient than solid state.
• Commercial, solid-state inverters are 90-95% efficient (ex., [1])

http://www.technology.niagarac.on.ca/people/mcsele/i2k.htm

Another, smaller-power, less documented example:

http://www.i4at.org/lib2/inverter.htm