Solar home metering and monitoring - Residential - Up to 10 KWatt installed.
It provides:
-- emails with alarms
-- a couple of dashboard showing continuously:
voltage/current/active power, apparent power, and power factor,
both the latest state and historic data aggregated over the last day/week/year.

This is both a software and hardware open source project. The schematics and board layout design for the sensor board, the programs in C and Go, DB schema, and the other configuration files needed are all offered free of charge under a GPLv3 license.

https://bitbucket.org/claudio_ortega/residential-power-meter/src/master