Voltage Regulator kVA Calculator
Select your appliances to instantly see your total load and the right voltage regulator capacity for you.
| Appliance | Power (W) | Qty |
|---|---|---|
| Refrigerator | ||
| Washing machine | ||
| Dishwasher | ||
| Electric oven | ||
| Air conditioner (12,000 BTU) | ||
| Combi boiler | ||
| Television | ||
| Computer | ||
| Lighting (LED) | ||
| Water pump / booster pump | ||
| Heat pump | ||
| Server / rack cabinet | ||
| Medical device | ||
| CNC machine | ||
| Compressor | ||
| Elevator motor |
How do you calculate kVA?
Voltage regulator capacity is expressed in kVA (kilovolt-amperes). The total power of your appliances (W) is converted to apparent power by dividing it by the power factor: kVA = Total W ÷ (1000 × power factor). Because loads such as compressors, pumps, air conditioners and motors draw several times their rated current at start-up, a 20–25% safety margin is added to the result.
Example
For a detached house with a total load of 6,000 W: 6,000 ÷ (1000 × 0.8) = 7.5 kVA; with a 25% margin, 9.4 kVA is required. In this case a 10 kVA single-phase voltage regulator is the right choice.
Single-phase or three-phase?
If your electricity supply is single-phase (220 V), choose a single-phase regulator; if it is three-phase (380 V), choose a three-phase regulator. In three-phase installations, the calculated power is the total across all three phases.