Uninterruptible power supplies (UPS) rely on the mains voltage being within appropriate limits to ensure their batteries are in good condition and fully charged so as to be able to provide the specified autonomy after mains failure.
There have been many expensive cases of failure to provide the required back-up due to the supply voltage having been low and, unknown to the user, the UPS actually running from its batteries.
Fitment of a voltage stabiliser before the UPS is an economical and effective way of avoiding what could otherwise be at the least an embarrassment and in some cases a disaster.
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