We can easily calculate it by using our Power Triangle Formula. It is the most authentic method of calculating the Watts from KVA or vice versa.
Where;
S = Apparent Power = KVA
P = Actual Power or Real Power = KW
Q = Reactive Power = KVAR
If we have Power factor known, then it is very easy to determine the other values. If p.f is not known, we assume the power factor to be 0.8 or 0.9 for an equipment or a system.
Let’s say we have a generator of 10 KVA, with a p.f of 0.8 lagging, then we can easily calculate the KW in this way.
p.f = KW/KVA
Just plug in the values.
0.8 = KW/10
KW = 10*0.8
KW =8
SO WE GET A POWER OF 8000 WATTS
In your case, lets assume,we have p.f of 0.8 and 3300 watts, so calculate KVA’s in this way;
p.f = KW/KVA
0.8 = 3.3/KVA
OR
KVA = 3.3/0.8
KVA = 4.125
Or;
4.125 kVA MAKES 3300 WATTS.
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