You can find out more about IoTaWatt at the forum mentioned above or better yet in the github repo at https://github.com/boblemaire/IoTaWatt
Iotawatt does record data. Up to fifteen years worth, the most recent year at 5 second resolution. It also has APIs to query and use that data with an integrated visualization application.
It is correct that it can also upload data to Emoncms, and also to an influxDB database - or both. Moreover, it maintains context and bulk uploads historical data after a communication outage, or simply on demand to load a new database.
Other differentiators might be:
- IoTaWatt has 14 inputs vs 2 on the Pi.
- IoTaWatt will work with any combination of popular CTs with no reprogramming or calibration required.
- IotaWatt can report, historically or real-time, Volts, Hz, Watts, Kwh, Amps, VA, and PF
- IoTaWatt can be used with three phase power.
- IoTaWatt costs less.
- Emonpi supports optical meter reading
- Emonpi supports temperature sensors
- Emonpi supports MQTT and OpenHab