SW inverter to battery cable calculation [RE-wrenches]

[Joel Davidson]

Last week I asked someone at Xantrex technical service for the fuse,
breaker and wire loss calculations for the cable between the SW inverter
and the battery, but the person I talked to did not know the
calculations.

One system designer uses this calculation for the SW4024:
4000 watts divided by 22 volts divided by 0.85 inverter efficiency =
213.9 (for the 250 amp breaker) and an additional 1.25 NEC = 267 amps
for the 300 amp fuse.

Another system designer uses this calculation for the SW5548:
5500 watts divided by 0.8 inverter efficiency divided by 40 volts = 172
amps DC plus 28 amps RMS AC current = 200 x 1.25 NEC = 250 amps battery
cable rating.

Does anyone know the correct efficiency multipliers for the SW inverters
and the calculation to use?

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