1KOMMA5° Python API Client

onekommafive is an unofficial Python client for the 1KOMMA5° Heartbeat home-energy-management API — the platform behind 1KOMMA5°'s heat pumps, solar inverters, battery storage systems, and EV chargers (wallboxes).

Read live power flows, control EV charging, monitor Dynamic Pulse market prices, drive the AI energy-management system (EMS), and pull weather forecasts — from Python or a built-in 1k5 command-line interface.

⚠️ Unofficial. The API is undocumented and reverse-engineered from the mobile app; it may change without notice. Not affiliated with or endorsed by 1KOMMA5°.

Table of contents

• Installation
• Quick start
  • Command-line interface
  • Python library
• Features
• Reference
  • CLI commands
  • Python models
  • Endpoint reference
• Development
  • Running tests
  • Linting and pre-commit
  • API version monitoring
• Compatibility
• Related projects
• Credits
• License

Installation

Requires Python 3.11 or newer.

pip install onekommafive

With development extras (pytest, responses, ruff):

pip install "onekommafive[dev]"

Quick start

Set your 1KOMMA5° credentials once via environment variables. All CLI commands and the token cache pick them up automatically:

export ONEKOMMAFIVE_USERNAME="user@example.com"
export ONEKOMMAFIVE_PASSWORD="s3cr3t"

# Optional — pin to a specific system (default: first system on the account)
export ONEKOMMAFIVE_SYSTEM="<system-uuid>"

Command-line interface

$ 1k5 live
System:       xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Status:       ONLINE
PV power:     +1837 W
Battery:      +4802 W  SoC 61.0%
Grid:         +5914 W  (import +5914 W  export +0 W)
Consumption:  +2950 W
Household:    +1900 W
EV chargers:  +0 W
Heat pumps:   +2000 W
ACs:          +1500 W
Self-suff.:   0.0%

$ 1k5 ai-summary
System:      xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Resolution:  1M
Self-suff.:  73.0%   (solar 331.2 kWh, battery 301.3 kWh)
Earned:      30.41 €   (378.7 kWh sold @ 0.0803 €/kWh)
CO2 saved:   365.0 kg, ≈ 1431 car km (PV 1005.4 kWh)
HB price:    0.0746 €/kWh
Peak avoided: 22.50 €  (grid 60.18 € − battery 37.68 €)

See CLI commands for the full list and 1k5 --help for every option.

Python library

from onekommafive import Client, Systems

client = Client("user@example.com", "s3cr3t")
system = Systems(client).get_systems()[0]

# Live overview
ov = system.get_live_overview()
print(f"PV: {ov.pv_power} W  Battery: {ov.battery_power} W ({ov.battery_soc:.1f}%)")
print(f"Grid: {ov.grid_power} W  Self-sufficiency: {ov.self_sufficiency:.0%}")

# Market prices for today (EUR/kWh, hourly)
import datetime
today = datetime.datetime.now().replace(hour=0, minute=0, second=0, microsecond=0)
mp = system.get_prices(today, today.replace(hour=23, minute=59, second=59))
print(f"Avg spot: {mp.average_price:.4f}  all-in: {mp.average_price_all_in:.4f} EUR/kWh")

# Switch the EV to solar-only charging
from onekommafive.models import ChargingMode
ev = system.get_ev_chargers()[0]
ev.set_charging_mode(ChargingMode.SOLAR_CHARGE)
ev.set_target_soc(90.0)
ev.set_primary_departure_time("07:30")

# Aggregated AI performance (self-sufficiency, earnings, CO2, peak-price avoided)
summary = system.get_heartbeat_ai_summary(resolution="1M")
print(f"{summary.self_sufficiency_percent:.0%} autonomous, "
      f"{summary.earned_amount_eur:.2f} € earned, "
      f"{summary.co2_saved_kg:.0f} kg CO2 saved")

Every response is a fully-typed dataclass — the entire surface has type hints.

Features

Live and historical

• Live power snapshot — PV, battery, grid, consumption, per-device flows, self-sufficiency
• Energy summary and timeseries for today or any historical range (1h / 15m)
• Market electricity prices with grid costs and VAT (1h / 15m)
• Weather forecast — today, tomorrow, plus 3-hour slots for 48 h
• Aggregated Heartbeat savings (EUR) for any date range

Control

• EV charger — charging mode, target SoC, departure time, current SoC
• EMS — automatic or manual override, Time-of-Use, per-device manual settings

AI and analytics

• AI optimisation decisions (battery / EV charging, with market-price context)
• Self-sufficiency events — granular battery-discharge trace
• Heartbeat AI performance summary — self-sufficiency, feed-in earnings, CO₂ saved, peak-price avoided
• Lifetime CO₂ savings (site, community, global estimate)
• Lifetime and monthly energy-trader savings

Metadata and configuration

• System, site, and full customer records
• Site status and hardware asset inventory (inverter, heat pump, meter, EV charger — with manufacturer / model / serial / firmware / network address)
• Active feature flags per site (Dynamic Pulse, Time-of-Use optimisation, smart charging)
• Wallbox hardware (distinct from vehicle-side EV profile)
• Smart-meter registration (ENTSO-E control-area EIC, DSO BDEW code, concession fee)
• User profile plus every site the user is authorised for
• Notifications and per-category channel preferences
• User-configured and comparison prices, contractual price guarantee
• API version compatibility check

Cross-cutting

• OAuth2 + PKCE authentication matching the mobile-app flow, with automatic silent token refresh
• Optional persistent token cache (chmod 600, user-bound) — subsequent CLI calls skip the login round-trip
• Built-in 1k5 CLI covering every read endpoint and all mutations
• 348 unit tests, live-verified against real accounts
• Ruff-clean, CodeQL-clean, pre-commit hooks

Reference

CLI commands

Set credentials with ONEKOMMAFIVE_USERNAME / ONEKOMMAFIVE_PASSWORD env vars (see Quick start), then:

Run 1k5 --help or 1k5 <command> --help for parameters and defaults.

$ 1k5 optimizations
System:  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Period:  2026-03-19 – 2026-03-19
Events:  25

Timestamp               Asset     Decision                    Price    SoC
--------------------------------------------------------------------------------
2026-03-19 00:00:00     BATTERY   BATTERY_NO_DISCHARGE        29.79     55%
2026-03-19 00:00:00     EV        EV_CHARGE_FROM_GRID         29.79     55%
2026-03-19 10:00:00     BATTERY   BATTERY_CHARGE_FROM_GRID    18.82     24%
2026-03-19 14:00:00     BATTERY   BATTERY_CHARGE_FROM_GRID    21.46     92%
2026-03-19 16:00:00     BATTERY   BATTERY_NO_DISCHARGE        28.44     87%
2026-03-19 22:30:00     BATTERY   BATTERY_NO_DISCHARGE        31.97      —

$ 1k5 weather --forecasts
System:   xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Heute:    Regen                         16.1 °C  ☀ 6.4 h  🌧 5.2 mm (87%)  ↑2026-03-11 05:57  ↓17:32
Morgen:   Heiter                        14.3 °C  ☀ 4.1 h  🌧 1.0 mm (20%)  ↑2026-03-12 05:55  ↓17:34

Zeit (UTC)           Wetter                         Temp    Wind      Regen   Prob   Sonne
--------------------------------------------------------------------------------------------
2026-03-11 15:00     Regen                          10.2°C  3.8 m/s   1.1 mm   51%   0 min
2026-03-11 18:00     Regen (Nacht)                   8.5°C  2.9 m/s   0.5 mm   40%   0 min
2026-03-11 21:00     Klar (Nacht)                    7.1°C  1.8 m/s   0.0 mm    5%   0 min

Python models

Every endpoint returns a typed dataclass from onekommafive.models:

Every model exposes a raw attribute (dict[str, Any]) with the full untouched API response for fields that are not (yet) mapped.

Endpoint reference

Complete curl-level reference for every HTTP endpoint — URLs, query parameters, response JSON, and every known API quirk — is in API.md.

Development

Running tests

Standard (pip):

pip install "onekommafive[dev]"
pytest

Alternative (uv, faster and backed by the checked-in uv.lock):

uv sync --all-extras
uv run pytest

Integration tests (require credentials, read-only, no mutations):

ONEKOMMAFIVE_USERNAME=... ONEKOMMAFIVE_PASSWORD=... pytest tests/test_integration.py -v

Linting and pre-commit

Lint with ruff:

ruff check .

Install the pre-commit hooks once after cloning:

pre-commit install

The hooks run ruff on every commit. CI runs ruff and CodeQL on every push and pull request.

API version monitoring

scripts/probe_versions.py probes every known endpoint for newer API versions than the ones currently used by the client. Run it after a 1KOMMA5° app update to catch version bumps early:

ONEKOMMAFIVE_USERNAME=... ONEKOMMAFIVE_PASSWORD=... \
PYTHONPATH=. python scripts/probe_versions.py

Compatibility

This project is developed against the author's own 1KOMMA5° installation. It has not been tested broadly across hardware configurations — a lot of it is "it works for me". Use at your own risk.

Reference setup:

Related projects

1komma5-ha

A Home Assistant integration built on top of this library. Exposes your 1KOMMA5° system as sensors, switches, and controls directly in Home Assistant.

Credits

Large parts of this project are inspired by and based on the work of Alex Birkner and his hacs_1komma5grad integration. Many thanks for paving the way.

License

MIT — see LICENSE.