Power supply for energy meter?

[carpenter]

I want to design energy meters by connecting to the internet.
Everything is still under consideration.
Communication interface, maybe LoraWAN, maybe BT / WIFI, we'll see.
For the measurement itself, I will use IC from Analog Devices of the ADE series.
MCU maybe STM32L or EPS32 .

What I'm dealing with now is a power supply for that.
Requirements.
1. long life (decades)
2. high efficiency
3. isolated / non-insulated I don't know (ADE itself is not isolated, but has a resistance of 1M ohms to L)

I can think of sources from the simplest with precipitation C, through switched non-insulated like this to switched isolated as this or something completely different?
Can you advise?

 

[KlausST]

Hi,

A power saving STM32 maybe needs some 10mA, an ESP32 with WiFi maybe needs 10-20 of this.
Rhe one may be happe with single 3.3V, the other maybe needs 5V and 3.3V.
Thus I recommend to first decide wich microcontroller and measurement hardware you want to use, then decide which power supply to use.

Klaus

 

[carpenter]

If I do not put the ADE itself to sleep, the consumption theoretically ranges from 17mA to 150mA on 3.3V.
150 mA is the theoretical maximum, at full MCU power, transmission, display on, etc. Most of the time the MCU is asleep and the transmitter is not transmitting.
When using the long range LoraWAN, the consumption could peak at 250mA.