v1.13.1

Release v1.13.1

Release Date: 2026-03-01

Type: Patch release - Preserves 1 W / 1 Wh precision on power and energy sensors.

What's Changed

Fixed

• Power and energy values were truncated to 10 W / 10 Wh granularity - The
  integration converted watts to kilowatts (and watt-hours to kilowatt-hours)
  with a rounding step to 2 decimal places in the larger unit, which discarded
  the 3rd decimal that carries the actual 1 W / 1 Wh precision the Alfa device
  reports over Modbus. For example, a register value of 332 (332 W) became
  0.33 kW — which Home Assistant then displayed as 330 W, losing 2 W.
  Rounding now uses 3 decimal places, preserving the device's native
  precision end-to-end. Home Assistant's default display precision for POWER
  (kW) and ENERGY (kWh) sensors is already 3 decimals, so the improvement is
  visible immediately without any UI configuration changes.

Why 3 decimals, not 2?

The Alfa device's Modbus registers return integer watts and integer watt-hours.
When the integration divides by 1000 to convert to kW/kWh, the full precision
becomes a 3-decimal number (e.g. 332 → 0.332). Rounding to only 2 decimals
was destroying that 3rd decimal before the value ever reached Home Assistant.
With 3 decimals, the values round-trip cleanly: 332 W is stored as 0.332 kW,
which Home Assistant can render as 0.332 kW or convert to 332 W exactly.

Credits

Thanks to asp Andrea on the Home Assistant community forum for spotting
and reporting this precision issue.

Full Changelog:
compare/v1.13.0...v1.13.1