Wi-Fi drops and the CCTV reboots every time the power blips? Here is what a home UPS does, which type to choose, and when you need more.
A small home UPS keeps the internet router, the fibre box, the CCTV recorder and perhaps a computer running through short power cuts; it is not a way to run the whole house. Wikipedia's article on uninterruptible power supplies lists typical protection times of 5 to 20 minutes for a basic standby UPS and 5 to 30 minutes for a line-interactive one, which is enough to ride out a brief cut or shut equipment down safely. If you need lights, fridge, pumps or aircon for hours, the answer is whole-house backup: a generator or a battery system, designed by a registered electrical contractor.
A few years ago a short power cut in a Malaysian home meant waiting in the dark. Today the same cut drops the Wi-Fi in the middle of a work call, reboots the CCTV recorder so it stops recording, locks out a gate or door system, and may corrupt a computer that was saving a file. Most of this equipment uses very little power, which is why a small UPS on the shelf is often all that is needed. The mistake is expecting the same box to run the fridge or the aircon.
Before buying anything, watch what actually happens in your home during a cut. Note which devices go off, which ones restart on their own, and which need someone to reset them. Check whether the fibre box, the router and the CCTV recorder share one socket or sit in three different rooms, and whether the gate, the door lock or the alarm already has a battery of its own. That list, not the size of the house, decides what you need.
An uninterruptible power supply sits between the wall socket and your equipment. It holds a battery and an inverter, and when the mains fails it switches your equipment to battery power. Wikipedia describes the basic offline or standby UPS as providing surge protection and battery backup: the protected equipment normally runs straight from the mains, and the UPS switches to its battery when the voltage falls below or rises above a set level. Better designs also deal with brownouts, when the voltage sags without failing.
| Type | How it works | Typical use at home |
|---|---|---|
| Offline / standby | Equipment runs on mains; switches to battery when the supply fails. Typical protection 5 to 20 minutes | Router, fibre box, a single PC |
| Line-interactive | Adds an autotransformer that corrects low or high voltage without using the battery. Typical protection 5 to 30 minutes | Router plus CCTV recorder, home office, areas with frequent dips |
| Online (double-conversion) | Batteries are always connected to the inverter, so there is no switch-over when power fails | Sensitive equipment; a small home server |
Wikipedia notes that a standby UPS can take up to 25 milliseconds to switch over, which most routers and recorders ride through, while an online UPS has no switch-over at all because the equipment is always fed from the inverter. For most homes, a line-interactive unit is the sensible middle ground.
List the equipment that must keep working in a cut, and nothing more. The shorter the list, the smaller and cheaper the UPS and the longer it lasts.
Leave off anything with a heating element or a compressor: kettles, irons, water heaters, fridges and aircon draw far more power than a small UPS can supply.
Runtime depends on two things: how much power the connected equipment draws, and how much energy the battery stores. A router and fibre box draw little, so a small UPS can keep them going far longer than it could keep a computer and screen running. Add up the power rating of each device from its label or adapter, and compare that with the runtime chart the UPS maker publishes for that load. Wikipedia also warns that a brief self-test of a few seconds may not show the true runtime; only a longer rundown test does, and that deep discharge is itself hard on batteries.
The battery is the consumable part of any UPS. Heat shortens its life, so keep the UPS in a ventilated spot out of the sun, not in a closed cabinet or on a hot roof space. Most units beep or show a warning when the battery needs replacing; do not ignore it, because a UPS with a dead battery gives no backup at all and may still switch equipment off when the mains dips. Wikipedia notes that larger installations are moving from sealed lead-acid batteries to lithium iron phosphate for longer cycle life, and the same choice is starting to appear in home units.
Mark the date the UPS was bought on its side, and test it now and then by switching off the wall socket for a moment while the equipment is running. If the equipment goes off with it, the battery or the unit has failed, and it is far better to find that out on a quiet afternoon than in the middle of a storm.
Plug the UPS into a proper wall socket, not an extension reel, and plug the protected equipment into the UPS outlets. Do not plug a UPS into another UPS or into a surge strip. If the router, fibre box and CCTV recorder are in different rooms, it is often better to move them to one place with one socket and one UPS than to buy several small units. Adding a dedicated socket for this is electrical work, which must be done by a competent person registered with the Energy Commission. If the house trips often, find the cause first; our power tripping guide explains how.
If the goal is to keep lights, fans, the fridge, water pumps or aircon running for hours, a plug-in UPS is the wrong tool. The two whole-house routes are a standby generator, which ClickBina's genset guide explains, including the safe changeover that stops power feeding back into the grid, and a battery storage system, usually with solar panels, which our home solar battery guide covers. Both are designed around your actual load and installed as part of the house wiring by a registered electrical contractor.
| Need | Usual answer | What to plan |
|---|---|---|
| Keep Wi-Fi and CCTV running through short cuts | Small line-interactive UPS | One socket, ventilation, battery replacement |
| Keep a home office working through a cut | Larger UPS for PC, screen and router | Load and runtime chart for the actual equipment |
| Run lights, fridge and pumps for hours | Standby generator or battery system | Load assessment, changeover, installation by an electrician |
| Cut the electricity bill and add backup | Solar panels with battery storage | Roof, inverter type, battery sizing |
ClickBina is an experienced KL & Selangor contractor for home refurbishment and trade coordination. Backup power is quoted case by case: WhatsApp us your job details for a quote, including what you want to keep running, where the equipment sits, and whether you are also renovating. We reply within the hour, the price we agree is a flat price with no hidden charges, and a site visit is RM150, waived if you go ahead.
About the figures: protection times are the typical ranges given in the Wikipedia article; the runtime you get depends on your equipment and the UPS model, so check the maker's runtime chart. ClickBina does not publish UPS prices, so none are given here.
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