Doorbell Power – What You Need to Know for a Smart Video Doorbell
When you add a video doorbell, the first question is simple: how does it get power? The answer decides how you install it, how much you spend, and how often you’ll need to replace batteries. In the UK most homes already have a low‑voltage transformer for the traditional bell, but not every smart doorbell can use that same source. Let’s clear up the confusion so you can pick the right setup for your house.
Wired Power: How It Works and What You Need
Wired doorbells hook up to a 16‑24 V AC transformer that’s usually hidden behind a fuse box or near the front door. The transformer steps down the mains voltage and feeds power to the mechanical bell and, in many cases, to a video doorbell as well. If the transformer is rated at 16 V and supplies 500 mA, you have enough juice for most wired models.
Check the label on your existing transformer. It will read something like “16 V 2 A” or “24 V 1 A”. The higher the amperage, the more devices you can run without overloading the circuit. For a busy household that also wants a smart lock, a 2 A unit is a safe bet.
Installation is straightforward if you’re comfortable with basic wiring: turn off the breaker, locate the transformer, connect the doorbell’s two wires to the “front‑door” terminals, and secure the unit to the wall. Most UK installers charge £70‑£120 for the job, which includes checking the transformer and testing the doorbell.
Wired power gives you continuous operation, no battery swaps, and a reliable connection that won’t drop when the Wi‑Fi is spotty. The downside is the need for a compatible transformer and the upfront installation cost.
Battery Power: Pros, Cons, and Real‑World Life
Battery‑powered doorbells avoid any wiring hassles. They come with built‑in rechargeable cells or use replaceable AA/AAA packs. A typical lithium‑ion pack lasts 6‑12 months, depending on motion‑trigger settings, video resolution, and how often you get visitors.
To stretch battery life, turn off features you don’t need—like continuous recording or high‑resolution video in daylight. Many models let you set a “low‑power” mode that only records when motion is detected. That can push a full charge beyond a year.
The biggest advantage is flexibility. If you rent a flat or live in a period property where drilling is a nightmare, a battery doorbell installs in minutes with a simple mounting plate. You also avoid any transformer compatibility issues.
However, batteries do require maintenance. When the charge drops, you’ll get a notification on your phone, and you’ll need to press a button to start a recharge or swap out cells. In cold weather, battery performance can dip, so keep an eye on the app’s health check.
When choosing a battery model, look for a claimed battery life that matches your usage pattern and a charging dock that can be tucked away discreetly.
Bottom line: if you want set‑and‑forget power and don’t mind an electrician’s visit, go wired. If you need a quick install or move often, battery power works fine as long as you manage the settings.
Whatever you decide, make sure the doorbell you pick is certified for UK use (CE marked) and supports the voltage range of your existing transformer if you go wired. A simple check now saves a lot of hassle later.
