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You can get every monitors that just plug in… You plug the monitor into the socket, and then whatever equipment you want to measure into the monitor. This will give you a kWh measurement.
Also, if you are charging an EV without solar panels installed, your are definitely going to see your builds go up. That said, there are devices that essentially allow you to use your EV battery just like you would a solar battery… So you can charge off peak and then use the energy during peak times if you aren’t intending to drive that day. I would definitely look into this. I think Octopus have a service that can help with that, so if might be worth giving them a call. And of course, if you don’t have solar, it sounds like a great time to install some, even if it’s just a single panel or two on the office, they will pay for themselves arrow quickly in today’s energy market.