chint_pm

Home Assistant custom integration for Chint DTSU666 three phase power meters, read over Modbus (RTU over a serial port, or TCP through a gateway).

Supported variants:

• DTSU666-H (the meter shipped with Huawei inverters)
• DTSU666 / DTSU666-CT

Requires Home Assistant 2025.6 or newer.

Installation

Add this repository to HACS as a custom repository (category: integration), install it, restart Home Assistant, then add the integration from Settings → Devices & services → Add integration → Chint powermeter DTSU666.

The setup asks for the meter variant, the connection type, the port or host, and the Modbus unit id (11 by default). The wiring mode (3P4W or 3P3W) is read from the meter and offered as the default on the last step.

Sensors

Voltages, currents, active and reactive power per phase, power factor, frequency, and the imported/exported active energy totals are enabled by default. The meter's configuration registers (transformer ratios, Modbus settings, on-board clock) and the four reactive energy quadrants are created as disabled diagnostic entities; enable the ones you need.

Line-to-line voltages are enabled automatically when the meter reports 3P3W wiring, phase voltages when it reports 3P4W.

Notes

• The DTSU666 (non-H) returns raw integers that are scaled per the conversion table in the operation manual; the -H returns ready-to-use floats.
• The current and voltage transformer ratios (IrAt, UrAt) are exposed as diagnostic sensors but are not applied to the measurements. If your meter is wired through current transformers, scale the values yourself (for example with a template sensor).
• The active energy totals are read from 0x4026 on the -H. The manual documents 0x401E, but that block returns invalid data on this variant.

Register maps for the supported variants are in docs/.

Changelog

0.1.1

• Fixed the 0.1.0 release, which could not be imported at all. A merge conflict had been resolved by keeping both sides, so __init__.py contained the old and the new implementation stacked on top of each other while carrying only the new imports. The first statement of the leftover old code, T = TypeVar("T"), raised NameError: name 'TypeVar' is not defined (issue #49). The same merge left a stub validate_serial_setup and the old serial step in config_flow.py, which would have broken serial setup too.

0.1.0

• Reworked for current Home Assistant: config entry runtime_data, a coordinator module, frozen entity descriptions, translated entity names, and icons.json.
• Fixed config entry migration, which crashed on every upgrade from version 1.
• Fixed the four reactive energy quadrant sensors, which never produced a value.
• Fixed the DTSU666 (non-H) configuration registers and the exported energy total, which were lost to a decoding error.
• Fixed the reactive power sensors on the DTSU666 (non-H), which used an energy unit that Home Assistant rejects.
• Total active power demand is now read from 0x2050 (per the manual) and reported in watts instead of amperes.
• Config flow no longer blocks the event loop and now assigns a unique id, so the same meter cannot be added twice.
• Failed register reads are logged instead of being silently discarded.
• Relicensed from CC0-1.0 to MIT. HACS requires an OSI-approved license, and CC0 is not one.

0.0.9

• Add support for multiple types of DTSU666.
• Fix serial connection init issue.

License

MIT. Released under CC0-1.0 up to and including 0.0.9.