Calculating kVA Load
The calculation for single phase loads on a three phase generator is a bit complex due to the fact that a three phase generator has to be de-rated by 1/3 when used on single phase. This is because the current for an equivalent kVA, single phase is much higher than for three phase.
V = Voltage generated
I = Amps Available
kVA = Kilo Volt Amps
.66 = De-rating factor of 1/3
Calculation Example 1
The current which can be supplied by a three-phase 50 kVA generator when connected 240 volt single phase is determined as follows:
First de-rate by 1/3 e.g. 50kVA x .66 = 33 3VA
for single phase I = kVA x 1000 ÷ Volts = 33 x 1000 ÷ 240 = 132.5 Amps
You require a 30 Amp single phase 240 volt capable unit to be powered . What size generator do you require?
for single phase generator kVA V x I ÷ 1000
for a three phase generator kVA = 7.2 ÷ .66 = 10.9 kVA
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