Can I install 2 G400 camera ( front and back doors) running on the one transformer
I do not think that it is possible because each camera should have his own power supply to properly working, but in theory it could be possible if your transformer have 12/24 V and gives you between 24/30 VA. it needs to be powerful to can handle both devices.
To better understand this are the requirements exactly :
-Power per doorbell: Each Aqara G400 typically requires an input of 8Vā24V AC (with a recommended minimum of 1.3A) or 8Vā24V DC (0.8A), which translates to roughly 10.4 VA to 12 VA per device.
-Total power required: To comfortably power both doorbells simultaneously, the shared transformer needs to deliver at least 24 VA to 30 VA while maintaining the standard output voltage of 12V or 24V.
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