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Google-Sheets-Logging
Log data from an ESP8266 device directly to Google Sheets without a third party service. Log sensor data, send data by pressing a button, and receive data from a Google spreadsheet. (NodeMCU, Wemos D1 mini, Adafruit Feather HUZZAH, etc)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
SOFTWARE: Don't know your needs, but once you have the hardware above, you have a platform that can read voltage and connect to wifi - serve a webpage, connect to another server to log, or a simple solution i like is log to a google sheet.
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