For users who build their own dashboards, automations, or offline analysis tools, real energy data is more useful when it is available at a stable interval. A single real-time power reading can show what is happening now, but half-hour kWh history helps users understand how electricity import and export change over time.

🔗 https://www.iammeter.com/blog/local-energy-history-api-kwh-readings

来源：iammeter.com · 2026-06-02

Just as a sidenote... in evcc, the total counters are read every 15 minutes also creating such slots, but with finer granularity. 15 minutes has been chosen because it is the same interval used for billing dynamic tariffs.

Ok, we will consider introducing a paramter, allow customers to adjust the intervals to 15min,30mins,60mins.