SAJ H2 Modbus
stanus74/home-assistant-saj-h2-modbus · vv3.1.1
Home Assistant Component to read SAJ H2 Inverter Modbus Data
In Apple Home through HomeKit Bridge
What HomeKit Bridge makes of each kind of entity this integration creates, read from its source code. A device only gets the ones that apply to it.
| Entity | Shows up as | Note |
|---|---|---|
switch | Switch or outlet | |
sensor | Sensor (temperature, humidity, air quality…) |
What people report
Built for the SAJ H2 over Modbus TCP; H1 firmware changes and HS3 all-in-one models are not officially supported because SAJ gives no protocol documentation.
- Works1
- Partly works1
- Won’t be supported1
| Device | In Home Assistant | In Apple Home | What they said | Source |
|---|---|---|---|---|
| SAJ H2 inverter | Works Local | Target model; export limit, TOU discharge, passive charging addedSaved copy… registers for controlling passive charging/discharging (Registers 3636H–363AH). See details in [Discussion #105](https://github.com/stanus74/home-assistant-saj-h2-modbus/discussions/105). --- ### ⚡ Fast Sensors Update The Fast Coordinator (10s) now also updates: * `sensor.saj_ct_pv_power_watt` * `sensor.saj_ct_pv_power_va` * `sensor.saj_ct_grid_power_va` * `sensor.saj_ct_grid_power_watt` Excerpt saved from GitHub on 2026-10-23. | PR #106 · 2025-10 | |
| SAJ H1-6K-S2-15 | Partly works Local | Newer firmware: some FAST power registers return 0Saved copyHi, First of all, thank you for developing and maintaining this integration. My SAJ H1-6K-S2 inverter was recently replaced under warranty. The replacement unit appears to be an SAJ H1-6K-S2-15 (according to the physical label), and it uses newer firmware: Display software version: 3.03 Master control software version: 1.377 Slave control software version: 1.377 Communications protocol version reported by the integration: 0.0 Control board hardware version: 1.0 Display board hardware version: 2.0 The old inverter was disconnected and the replacement was connected using the same Elfin EW10 so … Excerpt saved from GitHub on 2026-10-23. | Issue #196 · 2026-08 | |
| SAJ HS3-12K-T2-W-PX | Won’t be supported Local | Not officially supported; battery SOC reads 0%Saved copyUpdate: Confirmed inverter model, and new diagnosis from SAJ support I got a response from SAJ support with two important updates: Model correction: My inverter is actually a SAJ HS3-12K-T2-W-PX (part of the HS3/AS3 "All-in-One" series), not an H2 model as I originally assumed. I understand from this repo's README that it targets H2/HS2 registers specifically ("It should work for EKD-Solar too. They use SAJ HS2 Inverter"). Since HS3 isn't mentioned, I wanted to ask directly: is HS3 known to work with this integration, or does it use a different register map? That could explain why … Excerpt saved from GitHub on 2026-10-23. | Issue #201 · 2026-09 |
Gathered from GitHub issues, pull requests, discussions and docs, and from r/homeassistant. These are individual reports, so check the linked thread and the date before you buy.
How it connects
Local polling
Talks to the device on your network, asking it for updates every so often.
Details
| Installs (analytics) | 246 (0.03%) |
|---|---|
| GitHub stars | 54 |
| Latest version | v3.1.1 (2026-10-17) |
| Set up in the UI | Yes |
| Maintainers | @stanus74 |
| License | MIT |
In ReReHome
Whatever HomeKit Bridge shares reaches Apple Home as normal HomeKit accessories behind your Home Assistant bridge, so ReReHome shows and controls them like any other.
Bridges get their own settings page listing the accessories behind them.
