EmonLib VS IoTaWatt

I also use the Open Energy Monitor project. https://openenergymonitor.org/

I knew https://openenergymonitor.org/ a year ago. Maybe It is your interest

You may take a look at https://openenergymonitor.org.

https://openenergymonitor.org/ would be a good place to start, it's a mature project where the hard work is done.

You'll probably find the resources available on the OpenEnergyMonitor website quite useful, specifically their documentation on electricity monitoring. That covers theory, how to perform the required maths on an Arduino, and how to select the correct sensors etc.

Here's the one I use, good combination of hackable and user friendly, although it took a bit of research to understand what kit and add-ons I needed cause it's got a good number of possible confegurations: https://openenergymonitor.org/

I use Open Energy Monitor gear at home to monitor my (wholesale) power price and solar generation. They have off-the-shelf gear for EV chargers where the feed wattage is controlled. All you would need is a billing aspect.

You can also look at https://openenergymonitor.org/ . The unit that goes in the electrical box is ESP8266-based, so if you don't want to use their software you might be able to get it running in esphome.

Lots of ways. Sense.io. a few open source ones, iotawatt.com. Haven’t looked at this one too much https://openenergymonitor.org

If anyone is interested in having this type of real-time usage data for their own own home, I highly recommend IoTaWatt: https://iotawatt.com

It's a completely local energy monitor that you can install into your home's circuit breaker panel, and then view dashboards or read data via an API from a local web server running on-device. You choose how many sensors you want, but you can monitor your whole home as well as individual circuits.

For example, I track and trigger automations when my various appliances (laundry, dishwasher, microwave, etc) start/stop. It's very cool. Just be warned that it does require some research, basic understanding of electricity, and comfort working with high voltage mains connections if you plan to DIY it but I found it approachable and easy to setup.

What it looks like: https://i.ibb.co/qBVmBD1/IMG-1595.jpg

I use an IotaWatt system. It's super easy to install and manage. It uses inductive sensors at your circuit breaker so you can see your total usage and per circuit usage. It also easily hooks into HomeAssistant but that's a bit more advanced of a project.

I have an IotaWatt and am pretty happy with it. It was not the cheapest option; but is simple, reliable, and local only which checked all my boxes. I did install it myself; BUT this involved opening up and poking around inside my breaker panel. AFAIK this is pretty much required for any per-circuit home power monitoring. Insert "The power inside your breaker panel can kill you instantly and painfully" warning. My panel is mounted on the wall (rather than inside); and I guess I could have put the clamps on the wires where the exit the panel. But it would have been much harder to identify circuits. Also it would probably be much messier.

For individual circuit energy monitoring, I use Iotawatt. This involves installing CT clamps in the main breaker panel to monitor the circuits you want to monitor. I’m comfortable doing it myself but if you’re not, DO NOT mess around with it, hire a professional electrician instead because you can get electrocuted.

IoTaWatt https://iotawatt.com

If you really want to mail down your sources of current draw, I can’t recommend this enough: http://iotawatt.com

Since you have home automation, you may already know of IoTAWatt - it's a little cheaper than others, and works really well on its own or with HomeAssistant etc.

Sense is really good at measuring overall usage. Their neural network analysis to identify individual devices is anything but reliable. If this is important to you, I suggest you monitor individual circuits with something else (eg. iotawatt).