I’m new to energy monitoring, So I have some smart plugs which monitor electricity usuage. How do I add/combine them in a visual way on home assistant to see their energy usage over day/past week/past month.
Another thing I 'd like to ask is, I know how much power my tv, kettle, microwave, etc use. They are all connected to a smart plug too, but without the energy monitoring. Is there a way where I can get their combined power usage from their history. So I would first need to know how long they have been turned on for, then I can multiply their respective power with the time turned on, add these values and get a combined power usuage?
Is this possible… 
Thank you!!