Watts to VA calculation formula
S(VA) = P(W) / PF
The apparent power S in volt-amps (VA) is equal to the real power P in watts (W), divided by the power factor PF.
So,
VA = W / PF
volt-amp = watt / PF
For example:
Power (P) = 350W
PF = 0,7
Apparent power (S) = 350W / 0,7 = 500VA
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