SAX battery pilot for Home Assistant (Marketplace integration)

Installs: 68 sharing analytics
GitHub stars: 16
Connection: Works locally
Upkeep: Updated in the last 6 months
Version: v0.2.4.1, October 26, 2026
Kind: Marketplace integration
Needs: Needs the Marketplace (HACS on 2026.10 and older)
Domain: sax_battery
Source: github.com/matfroh/sax_battery_ha
Issues: Report an issue

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation.

Screenshots From the README of matfroh/sax_battery_ha.

About

SAX battery pilot for HomeAssistant is a custom integration that manages one or more SAX batteries locally. It adds sensors for state of charge, power status, power flow and estimated runtime, plus number entities for maximum charge and discharge power. Switches turn charging and discharging on or off and enable an automatic pilot mode. The pilot mode lets Home Assistant steer the battery in place of the SAX smart meter, using a chosen power sensor, and a minimum state of charge setting protects the battery. Power limits can feed automations, though steering and limiting need certain registers to be writable on the battery. Setup runs in the UI, where the number of batteries (one to three), their addresses and a master battery are entered.

Automatic summary of the README and code of matfroh/sax_battery_ha. Something wrong, or are you the maintainer and want your own text here? Get in touch

Supports

Works locally Talks to your devices on your own network. No vendor cloud in between.
From the Marketplace Installed through the Marketplace, formerly HACS.
Actively maintained Its author released or pushed a change in the last six months.

Provides

Switches
Sensors

Setting it up

Install it from the Marketplace and restart Home Assistant, then add it under Settings, Devices and services.

SAX Battery Configuration

Select your number of batteries (1 to 3)

Control Options

Control battery from Home Assistant replacing the SAX smartmeter (you need register 41 and 42 set to write).
Enable power limitations (you need registers 43 and 44 to be writable). Once setup, you can create automations that send the proper values to this number entity with your own rules.

Battery Control Settings

Minimum State of Charge (%)
Control Update Interval (seconds), 60 seconds should be enough
Enable Solar Charging, zero balance

Power Monitoring Sensors

Power Consumption Sensor, in Watts, a negative value means consuming from the grid and positive value equals injection into the grid
Power Factor Sensor, called cos(phi) or PF

Priority Devices setup

Priority Devices, if enabled, battery will not discharge or charge

Battery Connection Settings

Battery A IP Address
Battery A Port
Battery B IP Address
Battery B Port
Battery C IP Address
Battery C Port
Master Battery

After setup

Number of Batteries
Control battery from Home Assistant
Enable power limitations
Minimum State of Charge (%)
Control Update Interval (seconds)
Enable Solar Charging
Power Consumption Sensor
Power Factor Sensor
Priority Devices
Master Battery

Texts from the code of matfroh/sax_battery_ha.

Entities

NumbersMaximum Charge Power, Maximum Discharge Power
SensorsState of Charge, Power Status, Power Flow, Estimated Runtime
SwitchesCharging Enabled, Discharging Enabled, Automatic Pilot Mode

From the README

This is a custom component for Home Assistant to manage one or multiple SAX batteries. Work in progress for battery management, limiting discharge and charging levels as well as calculating the power to charge or discharge the battery, letting Home Assistant steer the battery. Multiple options are available depending on what registers you are allowed to write. Check the documentation to understand how to enable writing registers.

From the README of matfroh/sax_battery_ha, Apache License 2.0. Shortened.