I find it odd that they're using a Pi for this, it's not really a good solution for permanent installs, and is overly complex (and slow) for just monitoring a few sensors.

It could be done entirely on an ESP8266 or ESP32 for much less cost and complexity.

Other design choices that I find strange:

- Entire RaspberryPi available but only 2 CT inputs.

- Requires 2 plugs, vs monitoring line voltage from the same input that powers the Pi.

- LCD display on the front, when it's going to be installed somewhere I don't see it.

- Boots from SD card, which will fail eventually, or get corrupted when power fails and comes back on rapidly multiple times as is typical during blackouts.

- Custom 433mhz link, instead of using something standard like zigbee or wifi.