How Long Can an APC Back-UPS Power Your Wi-Fi Router & CCTV During a Long Power Cut? (India 2026 Sizing Guide)

When the power goes out for 3-4 hours, most Indian homes don’t actually need to keep a desktop or a refrigerator running — they just want the internet, the Wi-Fi router, and the CCTV DVR to stay alive. These are tiny, low-wattage loads compared to a PC, which means a correctly sized APC Back-UPS can often run them for far longer than most buyers expect. This guide breaks down the actual watt draw of routers, ONTs and CCTV systems, and shows you exactly how much runtime to expect from popular APC Back-UPS models so you don’t overpay for VA you don’t need — or undersize and get caught in the dark anyway.

Why Router & CCTV Loads Are Different From a Desktop PC

A desktop with a monitor can easily draw 150-300W, which is why it drains a UPS battery in 15-20 minutes. A Wi-Fi router, fibre ONT/modem, and a 4-channel CCTV DVR with cameras typically draw a combined load of 25-40W. That’s roughly one-tenth the power draw of a PC — which is exactly why the same UPS that gives a desktop 15 minutes can give your networking gear 3-5 hours or more.

Typical Power Draw of Home Networking & CCTV Equipment

• Wi-Fi router (dual-band): 8-12W
• Fibre ONT / ADSL modem: 8-10W
• 4-channel CCTV DVR (no cameras): 10-15W
• Each analog/HD camera: 4-6W
• 8-port PoE network switch: 15-20W
• Desktop PC + monitor (for comparison): 150-300W

Add up only the devices you want to keep running during an outage — don’t size for everything in the house. A router + ONT + 4-camera CCTV setup usually totals around 40-55W, which is a very light load for even an entry-level UPS.

Converting Watts to VA for a Back-UPS

APC Back-UPS units are rated in VA, not watts, and line-interactive models typically carry a power factor of about 0.6. So a 40W combined router+CCTV load needs roughly 40 ÷ 0.6 ≈ 67VA of UPS capacity — well within even the smallest models. The headroom beyond that minimum is what buys you extra runtime, not just extra safety margin, because lighter loading always extends backup time on a sealed lead-acid battery.

Expected Runtime by Model (Networking Load Only)

These are indicative figures for a healthy, fully charged battery; actual runtime varies with battery age, ambient temperature, and whether the UPS is also feeding anything else on the same outlet bank. If you want backup that comfortably outlasts a typical 2-3 hour urban outage, the BX1100 gives meaningful headroom for a combined router+CCTV load, while a BX600 is enough if you only need the internet to survive.

Should You Use a Separate UPS for Networking Gear?

If your main desktop UPS is already loaded close to capacity, it’s usually better to run the router, ONT and CCTV off a small, dedicated line-interactive UPS rather than squeezing them onto the same unit as a PC. This keeps your internet and security cameras alive even if the desktop UPS trips on overload, and it lets you size each unit correctly instead of buying one oversized model for everything. You can browse APC’s full range of line-interactive UPS models to compare VA options for this exact use case.

Points Office Buyers Should Check

1. List every device you actually want to survive a power cut — don’t include printers or monitors you can live without.
2. Add 20-25% headroom over your calculated watt total for future devices (extra cameras, a second AP).
3. Check that the UPS has enough IEC/5-15R outlets for all your networking gear without needing extension boards.
4. If you’re outfitting a small office with multiple router/CCTV UPS units across rooms, you can generate an instant, GST-inclusive UPS quotation in a few minutes instead of negotiating unit-by-unit.

Frequently Asked Questions

Will a 600VA Back-UPS be enough for just a Wi-Fi router?

Yes. A router and ONT together draw barely 20W, so a 600VA Back-UPS can often keep your internet running for 3-4 hours, far longer than most urban power cuts last.

Does adding CCTV cameras drastically cut my backup time?

It does reduce runtime noticeably, since each camera adds 4-6W, and a DVR itself draws 10-15W. For 4+ cameras, step up to a 1000-1100VA model if you want backup beyond 2 hours.

Can I run my CCTV DVR and router on the same UPS as my desktop?

You can, but during an outage the desktop will drain the shared battery much faster, cutting into the time your router and cameras stay powered. A separate small UPS for networking gear is more reliable for continuous surveillance.

Does battery age affect router/CCTV runtime as much as it affects PC runtime?

Yes — an aging APC RBC battery loses capacity over time regardless of load type. If runtime has visibly dropped compared to when the UPS was new, check the APC RBC replacement battery range for your model.