(ET) Rotary inverter efficiencies

[Chris Zach <cz alembic crystel com>]

Thought I would take a few quick readings from the rotary inverter, both 
on DC side and AC side.

Elec-trak inverter, fully charged pack, 300 watt halogen light load. All 
readings taken off a Link-20 E-meter on the DC side and a P3 KiloWatt 
meter on the AC side.

With no load (inverter spinning)

Battery Voltage: 43.0 volts
Battery current: 3.1 a
Total wattage: 133 watts
AC voltage: 140.8 volts
AC current: 0 amps
AC frequency: 68.6 hz

----------------------------

With 300 watt halogen lamp:
Battery voltage: 40.4 volts
Battery current: 12.8 a
Total wattage: 517 watts

AC status:
AC voltage: 127.8
AC current: 2.54a
AC watts: 327.0
AC Frequency: 64.5 hz
Power factor: 1.0

So if we take away the 133 watts of no-load static cost, the efficiency 
differential seems to be about 85%. The total overall efficiency for a 
327 watt load is 63%.

Interesting.
C