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Inverter input calculations. When more exact data concerning
6.3.3
inverter input current is not available, the following formula may be used to calcu-
late inverter input current:
6.303.1
Formula: I =
Where:
I = Average input current in amperes
VA = Rated VA output of the inverter
= Efficiency of the inverter in decimal form
n
(See Note)
v a = va load on the inverter
E = Input terminal Voltage
Note:
The minimum inverter efficiency noted below shall
be used where applicable efficiencies in accordance
with the inverter specification are not avaihble:
Rotary
Static
Rotary
Inverter Rating
3/1
3
1
100 VA or less
0.35
0.25
0.60
0.35
0.65
0.40
101 VA to 250 VA
0.45
0.65
0.50
251 VA to 1500 VA
0.50
0.65
0.55
1501 VA to 2500 VA
0.55
0.65
0.60
Greater than 2500 VA
Sample inverter input current calculation. The inverter input
6.3.3.2
current at 28 volts for a 100 VA inverter supplying a 50 VA load is calculated as
follows:
Growth capacity calculations.
6.3.4
Formula:
6.3.4.1
Hp= Primary source growth capacity
where:
Hs= Secondary source growth capacity
J= Adjusted primary source capacity
K= Adjusted secondary source capacity
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