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- Power factor correction devices: Can they really reduce your electricity bill?
- Whilst it is true that using PFC on domestic (or industrial) appliances will not change the power used, and hence the charge for kWh, there are some cases where using PFC in the home can save money. In some countries, there is a charge for the kWh and the maximum demand. In Spain, maximum demand is not controlled by kW (although that's what you pay for), but by kVA using an MCB overcurrent device. For example, a MD of 3.45 kW would use a 15A MCB (for 230V) and if you exceed the current, the supply cuts off until the demand is reduced and the device reset. Since a poor PF will increase the current drawn, PFC will reduce this and allow you to operate with a lower MD, and therefore save money.