When the power goes out, your PC can shut down in the middle of work, your router can drop the internet, and your CCTV can stop recording. A UPS is the usual fix, but the choice between an online and an offline UPS confuses many buyers.
Here are 9 practical tips, from the basics to the technical details, to help you pick the right UPS for your PC, router and CCTV during load-shedding.
1. Know What a UPS Does
A UPS (uninterruptible power supply) is a device with a battery inside. When the main power goes off, it keeps your devices running for a limited time.
- It gives you time to save your work and shut down safely.
- It can keep small devices like a router running for longer.
- It is not a replacement for a generator or a large backup system.
Result: a UPS protects you from sudden power cuts, not from a long outage.
2. Understand How an Offline UPS Works
An offline (standby) UPS sends mains power to your devices normally. When the power fails, it switches to its battery.
- It is usually the simpler and lower-cost type.
- There is a very short switching time when the power cuts.
- It suits many home and basic office setups.
Keep in mind: most modern PCs handle the short switch well, but check the UPS specifications for your devices.
3. Know the Middle Option: Line-Interactive
Many UPS units sold as "offline" are actually line-interactive. They work like an offline UPS but add a feature called AVR (automatic voltage regulation), which helps correct low or high voltage without using the battery.
- This can help where the voltage often goes up and down.
- Check the product specifications to see if AVR is included.
Result: a good middle choice for many homes and small offices.
4. Understand How an Online UPS Works
An online UPS keeps your devices running through its battery and inverter circuit all the time. Because of this, there is no switching moment when the power fails.
- It gives cleaner, more stable power to your devices.
- It is generally more expensive than the other types.
- It is usually aimed at sensitive or important equipment.
Keep in mind: it is not automatically better for everyone. Many home users do not need this level.
5. Choose for Your PC
For a desktop PC, your main goal is to avoid sudden shutdowns that can cause lost work or file problems.
- A good offline or line-interactive UPS is enough for many home PCs.
- Choose an online UPS if your work is critical or your voltage is very unstable.
- Use the time on battery to save your work and shut down properly.
Result: your PC shuts down safely instead of losing power suddenly.
6. Choose for Your Router
A router and its internet connection device use very little power, so a UPS can keep them running for much longer than a PC.
- Include your router and any fibre or modem unit in your power plan.
- Some small DC backup units are made for routers. Check that the voltage matches your router's adapter before buying.
- If your internet provider's equipment is outside your home, your connection may still depend on their power.
Warning: a mismatched voltage can damage your device, so check the label on your adapter.
7. Choose for CCTV
CCTV systems often need to run through the night, so backup time matters more than for a PC.
- Include the DVR or NVR, the cameras and any network switch in your total power.
- Choose a UPS with enough battery capacity for the time you want.
- For a critical system, ask the seller whether an online UPS is more suitable.
Result: your recording continues during short outages.
8. Size It Properly: VA and Watts
UPS units are labelled in VA, and many also show a rating in watts. The watt rating is the more useful number for matching your devices.
- Check the watt rating on each device's label.
- Add up the total watts of everything you plan to connect.
- Choose a UPS rated comfortably above that total, rather than exactly equal to it.
Warning: do not connect devices that draw a lot of power, such as heaters or air conditioners. Check the maker's guidance for laser printers too.
9. Know How Long It Will Last
Backup time depends on the battery capacity and how much power your devices use. A heavier load drains the battery faster.
- Check the maker's information on how long the UPS can run at your load.
- Remember that batteries wear out over time and eventually need replacing.
- Check the warranty terms and whether the battery is covered.
Result: you know what to expect during a real outage, not just on paper.
Final Thoughts
For most homes, an offline or line-interactive UPS can protect a PC and router well. An online UPS makes more sense for critical equipment or very unstable power. Match the type, power rating and battery time to what you actually plug in.
If you are unsure, list your devices and their wattage and ask the seller before you buy, or look through our UPS collection to compare your options.
Ready to compare? Explore power backup options at Speed Technology & Engineering Ltd, or browse by brand:
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