How do Voltage Optimisers work?

Voltage optimisers use systematic and controlled voltage reduction to reduce the voltage (single or three phase mains power supply) received by an energy consuming device in order to reduce its energy usage, power demand and reactive power demand. Voltage optimisers are installed in series with the mains power supply and devices to be powered. Voltage optimisers work in countries such as the UK and especially in areas and on sites where the mains power supply has a higher voltage than 230Vac (single phase) or 400Vac (three phase).

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How do Voltage Optimisers work?