Possibly simple, inexpensive and ready energy meter with data dump

I'm looking for a simple way to measure current consumption on individual circuits, only so that I can analyse it over time - i.e. e.g. dump the data into excel, or download the measurements on the fly from the meter to Raspbery PI. I want it to be a fairly ready-made solution that does not require soldering and putting an additional microcomputer in the switchgear.

I have one idea, please comment on whether it makes sense, or hint how to do it better.

My idea is to purchase a three-phase counter with MODBUS RTU support and RS485 to TCP/IP converter. I assume that I could then connect to it from the Raspberry PI and collect measurements. The downside of such a solution is the price, because with the meter and converter I won't fit in 500PLN even if I order from Aliexpress.

Has anyone any other reasonably ready and preferably cheaper alternative?

Have you considered fitting a so-called smart wattmeter? These types of devices, for example rail-mounted, have quite a few functions. The app can indicate the current measurement, but it will also allow you to easily archive and analyse your energy consumption data. Threshold values can be set, or energy can be switched on and off remotely via your phone, or controlled via a preset schedule. Perhaps these functions will be sufficient for you, and will probably come out cheaper than a meter?

I thought about it, but these smart wattmeters are not cheap at all and it is not at all easy to download data from them in some universal format. I am now looking at MODBUS, I will try to integrate it with OpenHab.

You can connect to the RPi to the Modbus RTU using a cheap -5-10 PLN UART-RS485 converter instead of an RTU-TCP converter.
Eventually, you can make such a converter yourself, e.g. using Tasmot on ESP8266. I made one myself to read data from the RTU modbus of the Sofar inverter.