Introduction
There is an easy way to calculate the apparent power S (in volt-ampere). First, you need to determine whether you have single-phase or three-phase appliances and what different types of appliances you want to connect to the generating set.
We use the following formulas:

  • Single-phase:
    The active power P (in watt) equals the voltage V (in volt) multiplied by the current I (in ampere) and the power factor cos φ (between 0 and 1).

P = V*I*cos φ [W]

  • Three-phase:
    The active power P (in watt) equals the voltage V (in volt) multiplied by the current I (in ampere), the power factor cos φ (between 0 and 1) and the square root of three (√3). *

P = √3*VL*IL*cos φ [W]


The apparent power S (in volt-ampere) equals the active power P (in watt) divided by cos φ.
S = P/cos φ [VA]


* This is how we find the square root of three (√3):
- When connected in star: P = 3*(VL/√3)*IL*cos φ = √3*VL*IL*cos φ
- When connected in delta: P = 3*VL*(IL/√3)*cos φ = √3*VL*IL*cos φ

Now that we know the formulas, we can start determining the apparent power S.

Steps to follow in order to determine the loads
Step 1:
Make a list of all the appliances you would like to connect to the generating set. You can use the chart below.


List of appliances
Attention: Do not forget anything while determining the total power at home!

Appliance Active power P [W] HP Ohmic – Inductive Starting current Emergency
Chopper 2576 3.5 I
Lawn mower 1472 2 I
Air conditioning 1472 2 I
Compressor 2208 3 I
Pressure washer 2576 3.5 I
Pump 2944 4 I
Table saw 3680 5 I
Circular saw 1500 I
Drilling machine 600 I
Grinder 1000 I
Hammer drill 1200 I
Jigsaw 600 I
Planer 900 I
Hedge trimmer 600 I
Angle grinder 2000 I
Computer 300 I
Cooker 1400 O
Grill 1800 O
Toaster 1000 O
Microwave oven 1200 I
Mixer 350 I
Iron 750 O
Vacuum cleaner 750 I
Washing machine 1001 1.36 I
Tumble dryer 2502
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