1KOMMA5° Home Assistant Integration

1KOMMA5° (also written 1komma5, 1k5) runs the Heartbeat energy platform for solar + battery + heat pump + EV wallbox setups. This is the Home Assistant integration for it, distributed via HACS at github.com/mrebbert/1komma5-ha.

Dynamic electricity prices (dynamischer Stromtarif), 30-hour price forecast, AI optimization decisions, per-device cost allocation, cheapest-charging-window scheduling, weather forecast, and cloud push notifications — all as native HA sensors, services and bus events. Works on both 1KOMMA5°-backend accounts (emp_type: "1K5", most newer installs) and legacy GridX-backed accounts (emp_type: "GRIDX").

Highlights

• 60+ sensors across 8 coordinators covering power, energy, cost, dynamic prices, AI decisions, weather, system health, §14a grid-fee reduction and contract overview
• Dynamic tariff support with 30-hour price forecast, cheapest-window sensors, and per-consumer cost allocation
• AI optimization events — react to Heartbeat's grid-charge / heat-pump-recommend decisions in real time
• Cloud notification bridge (v0.1.52) — drive automations from the same push notifications the 1KOMMA5° mobile app receives
• Seven locales (DE, NL, FI, ES, DK, SE, AU) with per-market currency (EUR, DKK, SEK, AUD)
• Energy Dashboard-ready out of the box; no template sensors, no manual wiring
• Available in the HACS Default Store — no custom repository setup

Install

This integration is in the HACS Default Store — no custom repository setup needed.

1. Open HACS in Home Assistant
2. Search for 1KOMMA5°
3. Click Download
4. Restart Home Assistant

One-click open:

Then add the integration:

1. Settings → Devices & Services → Add Integration
2. Search for 1KOMMA5°
3. Enter your 1KOMMA5° account e-mail and password
4. If your account has multiple systems, pick the one you want

Credentials land in the Home Assistant config entry. Sensors appear within seconds.

For the full configuration surface, see Install & setup.

What's on this site

• Install & setup — HACS / manual install, config-entry options, re-authentication and reconfigure flows.
• Features — the 60+ sensors grouped by concern: live power & battery, dynamic pricing, energy & cost, §14a EnWG grid-fee, contract overview, AI optimization, EV & wallbox, weather, diagnostics.
• Services & bus events — get_cheapest_window, refresh_now, get_heartbeat_metrics, assign_ev_to_wallbox, plus the three automation bus events.
• Dashboards & blueprints — nine importable blueprints and two ready-to-import Lovelace dashboards.
• Devices & entity structure — sub-devices, multi-wallbox topology, PII guardrails.
• Compatibility — supported markets, HA version floor, OAuth2 flow.
• Known limitations — three cloud-API realities the integration cannot design around.
• FAQ — invalid_auth, EMS switch, 30401 log line, HACS cache lag, Energy Dashboard wiring, §14a semantics.
• Changelog · Contributing

About

Unofficial reverse-engineered integration maintained by the author against their own 1KOMMA5° system. The underlying Python client is published separately as onekommafive on PyPI with its own API reference. The API is undocumented and may change without notice — see Disclaimer.