Hi, I have a project and I need to calculate the energy usage of the whole system to choose a battery which I'd like to use lipo. I have already some information about the calculation but I'm confused at some points.
I know the formula ;
P = I^{2}R

∆E = Pt

and I know that if you want to calculate the whole system's energy usage, you should sum the sensor's energy need. And there are also websites to do this, it just wants to sum up mA, then gives the battery life that you need. But how? It also gives a formula but I can't understand. I give the system to you.

- Arduino nano
- MPU-6050
- Lora e45-ttl-100
- GY-NEO6MV2-GPS
- Adafruit BMP280 I2C
- Time 30 Minutes or more.

This is my first subject sorry if I have made mistakes.