Reolink Doorbell powersupply wattage

[gajotnt_202336444158149]

Acording to the documentation the Doorbell works with "24VDC or 12-24 V AC, 50/60 Hz", but what is the wattage requirement? (https://support.reolink.com/hc/en-us/articles/10300451805465-How-to-Power-Video-Doorbells-Using-Power-Cables-)

On another page they say that a 16V AC 30VA will work, but what is the minimum requirement? (https://support.reolink.com/hc/en-us/articles/10313334138265-Install-Reolink-Video-Doorbell-to-Existing-Doorbell-Wiring)

So do i need a 30 watt transformer or will it work with a lower wattage and if yes, what is the minimum?


Thanks

[Reolink Fiona]

@gajotnt_202336444158149 The lowest watt of the power supply is 8w.

[joseph_1979]

@gajotnt_202336444158149 If you consider a power factor of 1 (ideal scenario) then 30VA == 30W. But the doorbell unit will draw less than 500mA and so if you have 16V then a transformer with 10VA shall suffice. If, however, you intend to have more than 1 doorbell then you need to opt for a higher VA.

[christophe le roux 1_677848822186300]

I also have a question regarding power.
When the POE Doorbell is powered by POE, is there any voltage that we can use on the 2 screw near the SDcard slot ?
i need to power an ultra low powered eletric latch (less than 3w) and don't want to put a second cable from the house to the frontyard gate.
thanks

[joseph_1979]

@christophe-le-roux-1_677848822186300 Most of the Reolink POE cameras support the IEEE 802.3af standard. According to specs this provides a supply voltage of 44-57V, and supply current of 10-350mA. Max power output is limited to 15.4W. The Reolink POE doorbell consumes around 12W and so you have 3W@48V. See if this is adequate for your device. But I doubt your device can take 48V. It has to be a POE powered device.

[chris vandevelde_465103941865709]

@joseph_1979

Transformer to support two video doorbells
Which transformer should I get to power 2 Reolink Video Doorbells Wifi 2k wired? Any help gratefully received.

[chris vandevelde_465103941865709]

@chris-vandevelde_465103941865709 Would a Friedland E3539N Bell & Chime Transformer 12 Volt AC 2 Amp be OK?

[joseph_1979]

@chris-vandevelde_465103941865709 You need a 48VAC (Secondary) transformer.

[user_824156525916320_824156525916320]

@joseph_1979
I have the same question, only the adapter that comes with the video-doorbell gives secondary 24V DC 0,5 A.
Since the doorbell uses 12W, which is 0,5A@24V, then should an adapter with secondary 24V DC 1A or 24V DC 2A be sufficient?
Why 48V AC as the default adapter is 24VDC?