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ITFrequently Asked Questions · General
When do I need a voltage stabilizer for my home?
When there are frequent fluctuations or surges in the area, especially to protect sensitive devices.
A voltage stabiliser (AVR) corrects sustained voltage deviations, for example when the voltage drops noticeably below 230 V at peak times or rises too high in places close to a substation. These deviations put strain on motors and compressors, such as fridges, freezers, air conditioners and pumps, as well as on electronic systems such as boilers and security systems.
Signs that you may need a stabiliser include lights that flicker or dim when a large appliance starts, devices that switch off or restart for no reason, and frequent circuit-board failures. The most reliable diagnosis is to measure the voltage at different times of day, ideally with a data logger over a few days.
A stabiliser does not protect against power cuts; for that you need a UPS. If the voltage is permanently out of range across the whole neighbourhood, it is also worth informing the grid operator.
A common mistake is choosing a stabiliser based only on the rated power of the appliances. Motors and compressors draw several times their normal current when starting, so the stabiliser needs enough power headroom not to trip into protection.