Battery Backup for Security Cameras: What Actually Stays Recording

The four boxes in the chain

1. The cameras. 4–6W each for wifi cameras, or nothing at all for PoE cameras, which draw their power down the network cable from the recorder or switch.

2. The recorder or hub. An NVR draws 20–60W including its hard drive. A small hub draws 5–10W. This is the box that stores footage, and it is the one people forget.

3. The router and modem. About 20W together. Without these, cloud cameras cannot upload and you cannot view anything remotely. See Battery Backup for a WiFi Router and Modem.

4. Your ISP's equipment, down the street. You cannot power this, and if it is dark, your cloud cameras are recording to nowhere. This is the trap covered in Will My Internet Work During a Power Outage?

Total for a typical household system: 50 to 90 watts. A 1,000Wh unit runs the whole chain for 11 to 20 hours.

Cloud cameras vs local recording

This distinction decides how much an outage actually costs you.

Cloud-only cameras — most doorbell cameras and most consumer wifi cameras — upload footage to the manufacturer's servers. No internet means no recording, full stop. Powering the camera without powering the internet path accomplishes nothing.

Local recording — an NVR with a hard drive, or cameras with SD cards — keeps recording regardless of the internet. You cannot watch it live from your phone, but the footage exists and you can review it later.

For outage resilience, local recording wins decisively. If security during outages is genuinely a concern for you, this is the more important purchase than any battery.

The doorbell camera question

Battery-powered doorbell cameras keep running during an outage, because they have their own battery. But most of them are cloud-only, so they record nothing without internet.

Wired doorbell cameras run off a low-voltage transformer in your panel — which is dead in an outage. Some models have a small internal buffer battery; most do not.

So the doorbell is usually the first thing to go dark, and there is not much to do about it beyond keeping the router alive and accepting that the ISP may not be.

What to buy

A small UPS is often better than a power station here. A $100 UPS supporting the router, modem and NVR gives you a few hours automatically, with zero human involvement, and it switches over instantly so nothing reboots. For a two-hour outage — which is most outages — that is a complete solution and it costs a fraction of a power station.

A power station makes sense if outages in your area run long, or if you want the same battery covering the fridge. A 500–1,000Wh unit with UPS mode does both.

The combination is what serious setups use: UPS on the network rack so the gap is short enough that nothing reboots, power station to recharge everything and extend it into a second day.

Do not buy a large power station purely for cameras. 60 watts does not justify a $2,000 battery. Buy for the fridge and heat, and the cameras come along free.

Setting it up so it actually works

Put the whole chain on one battery. Router, modem, NVR, PoE switch. Missing one link breaks everything downstream.

Use UPS mode if your unit has it. Otherwise the equipment reboots the moment the grid drops, and network gear can take several minutes to come back — the exact minutes you cared about.

Label the plugs. In an outage you want to move four specific things to the battery, quickly, in the dark. Coloured tape on the four cords takes two minutes and saves ten.

Test it. Unplug the network rack and see what actually keeps recording. Nearly everyone discovers something they had not accounted for. See Run a Blackout Drill.

Two honest caveats

A determined intruder cuts power first, and no consumer setup fully solves that. Local recording with a hidden recorder is meaningfully better than cloud-only, and cellular backup for your router is the next step up. Neither is cheap.

Cameras record; they do not prevent. If the reason you are reading this is a specific safety concern rather than general interest, the equipment conversation is secondary to talking to your local police non-emergency line about your situation.

The short version

• Cameras draw 4–6W each. The recorder, router and modem are the real load, totalling 50–90W.
• A 1,000Wh unit runs the whole chain 11–20 hours.
• Cloud-only cameras record nothing without internet — and your ISP's street equipment may be down regardless.
• Local recording on an NVR or SD card is the more important upgrade than any battery.
• A $100 UPS on the network rack covers most real outages better than a power station does.