It took some efforts both in hardware and firmware to make an ESP32 run from HAN-port power only - and here are the...
Most users in Sweden (and many in other European countries) have a P1 port on their smart energy meter.
In some use situations, the Pow-U will have difficulties maintaining its voltage level and will reset frequently (see user manual for tips and remedies). Can power be connected to the micro-USB port to avoid this?
Many of us do not like the idea of sending our power consumption data to some cloud service where we do not really know who can access them. This is why our solution is on purpose not could based - with the added benefit of being a solution without any monthly subscription fee.
Especially solar panel installations are starting to become common, so we want to monitor power and energy from them!