The Video Doorbell is compatible with doorbell transformers that output 8-24 VAC (Volts of Alternating Current) with a maximum of 40 VA (Volt-Amps). An 8 VAC and 10 VA transformer is the smallest recommended size to power the Video Doorbell. The Video Doorbell requires an 8-24 VAC transformer rated at 40 VA maximum and a recommended 18-22 American Wire Gauge (AWG) wire for installation.
If your transformer voltage is below the recommended VAC and VA requirements, the Blink app will display "Wired power not supported." This means your existing chime wiring is not compatible, and your in-home chime will not sound for doorbell presses.
Note: The Video Doorbell requires Energizer AA 1.5-volt lithium non-rechargeable batteries for operation, even when wired.
Transformers display their voltage and Volt-Amps (VA) on the unit. This rating, sometimes labeled "max load" or "max power consumption," appears on the transformer's nameplate. Common transformer locations:
- Near the main electrical panel.
- Inside the doorbell chime box.
- In the garage or attic.
Rating information can be found:
- On external labels/stickers of the chime housing.
- Molded into the chime housing plastic.
- On internal labels of the chime housing.
In North America, most electrical circuits supply 120 volts. In the UK and most of Europe, power circuits supply 240 volts. Both of these power options are too powerful for a doorbell. A doorbell transformer takes the standard electrical voltage in your home and lowers it to about 10 to 24 volts. This keeps the Video Doorbell powered at the right voltage for optimal operation.