What causes the damage
When public power is restored, or when you switch between the grid and a generator, the voltage can briefly spike. Low or fluctuating voltage also strains power supplies and motors. Over time, or in a single bad spike, this can damage charging circuits, motherboards and TV power boards.
Surge protector, stabiliser or UPS?
Surge protector
A surge protector is an extension socket with built-in protection that absorbs sudden voltage spikes. It is the minimum protection for phones, laptops, routers and TVs. Look for a stated joule rating; a higher number means more protection.
Voltage stabiliser
A stabiliser (also called an AVR) keeps the output voltage steady when the incoming supply is too high or too low. It is useful for TVs, sound systems and home appliances in areas with unstable voltage.
UPS (uninterruptible power supply)
A UPS has a battery that keeps devices running for a short time when power goes off, so you can save work and shut down safely. It is ideal for desktop computers, Wi-Fi routers and home office setups.
What to use for each device
- Phones and power banks: a good-quality charger plugged into a surge protector.
- Laptops: a surge protector at minimum; the laptop battery acts as its own backup.
- TVs and soundbars: a stabiliser or a surge protector, especially for large OLED and QLED TVs.
- Desktop computers and routers: a UPS.
Simple habits that help
- When power returns, wait a minute before switching expensive devices back on.
- Unplug TVs and computers during storms, and when you travel.
- Use original or certified chargers. Cheap chargers often lack proper protection.
- Keep laptops and TVs ventilated; heat shortens the life of batteries and components.
- Avoid keeping phone and laptop batteries at 0% or 100% for long periods.
Keep power when the grid is off
A power bank keeps your phone running through outages. Our power bank guide explains how to choose the right capacity and charging speed.
Frequently asked questions
What is the difference between a surge protector and a stabiliser?
A surge protector absorbs sudden voltage spikes. A stabiliser keeps the voltage steady when the supply is too high or too low.
Do I need a stabiliser for my TV?
In areas with unstable voltage, a stabiliser or at least a surge protector is recommended for TVs, especially large OLED and QLED models.
Should I use a UPS for my laptop?
A laptop's own battery already acts as backup, so a surge protector is usually enough. A UPS is most useful for desktop computers and Wi-Fi routers.
How can I protect my phone when NEPA brings light?
Charge through a good-quality charger plugged into a surge protector, and wait a minute after power returns before plugging in expensive devices.