JK-BMS RS485 Add-on
The SmartPhoton project with the largest user community. Find JK-BMS RS485 Add-on for Home Assistant, its MQTT data and dashboards.
Explore JK-BMS & Multi-Pack ↗JK-BMS RS485 for Home Assistant
Your batteries.
Finally, a clear view.
Monitor cells, temperatures, alarms and batteries in Home Assistant. JK-BMS RS485 Add-on publishes your data through MQTT for dashboards and automations.
JK-BMSThe hardware
Inverters & energyFrom hardware to monitoring · SmartPhoton SCADA preview
Featured video · 14 October 2026
Two RS485 buses, running in parallel.
Discover the latest @domosimple demonstrations: real-hardware tests, Home Assistant modules and SmartPhoton developments.
The YouTube player loads after your click. The video retains its original language; subtitles are available on YouTube.
Home Assistant & MQTT applicationsProjects documented on GitHubTutorials on @domosimpleA community on the forum
One ecosystem, several starting points
Start with your equipment.
Inverter, battery or energy monitoring: find the project and resources that match your installation.
Voltronic & Axpert
Monitor and control your inverters in Home Assistant: solar production, consumption, battery and supported settings. The documentation guides you from connection to automation.
Discover Smart Voltronic ↗Pylontech / Pelio
A dedicated integration brings Pylontech battery monitoring into your Home Assistant environment.
Discover Pylontech / Pelio ↗KOSTAL
Monitor a KOSTAL + BYD installation through an ESP32 proxy and SmartPhoton Remote Bridge.
KOSTAL + BYD & ESP32 proxy →SmartPhoton Finance
Understand electricity costs, the value of solar production and the contribution of your batteries in Home Assistant.
Explore the module →MQTT Cloud Synchronizer
⌂Home Assistant
↔MQTT Cloud
▣Remote device
Connect remote devices to Home Assistant: data, commands and automatic entity creation through a cloud MQTT broker and a TLS connection.
Explore the synchroniser →Interfaces in use
From the home
to advanced monitoring.
Premium, Multi-Pack, SCADA and remote access: different views of your installation, illustrated by SmartPhoton interfaces.
Premium · Energy overview
Learn more →
Smart Energy Premium House
Solar, home, battery and grid together in an illustrated energy overview.
Click the image to enlargeLearn more →
Multi-Pack · Fleet & batteries
Learn more →
Monitor each pack
Fleet overview, site status, estimated runtime and access to diagnostics, followed by individual pack details.
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SCADA · Semi-professional
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An operations-focused view
Battery process view, communications, alarms, trends, logs and service views.
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KOSTAL + BYD · ESP32 proxy
Learn more →
View an installation remotely
SmartPhoton Remote Bridge displays a KOSTAL G3 / BYD HVS installation through the ESP32 proxy. The view shown is read-only.
Click the image to enlargeLearn more →
Screenshots supplied on 28 October 2026. They illustrate the interfaces; the displayed data is not a live demonstration. Availability depends on the module and version.
Openness is part of the project
Your data goes beyond
our dashboards.
All data exposed by SmartPhoton modules is accessible to other applications through MQTT. Use it in your own interfaces, histories or automations with a compatible application.
JK-BMS · Legacy / Multi-PackInverters & batteriesSmartPhoton modules
MQTTBroker · published data
Home AssistantNode-REDCompatible applicationsYour own interfaces
Get started with JK-BMS RS485
- Check your BMS model, firmware and supported connection in the documentation.
- Follow the production repository instructions to install and configure the add-on in Home Assistant.
- Check MQTT data and discovery, then choose your dashboard.
Development and testing
Upcoming features and tests are described in the roadmap.
View testing on GitHub →The story and the author
Developed and shared by Jean-Luc Martinelli, from early inverter tools to JK-BMS and Home Assistant.
The story and the author →Videos and screenshots
Explore SmartPhoton interfaces and developments in action.
Open the media library →Learn · Discuss · Contribute
Technology moves forward
through sharing.
SmartPhoton also means years of discussions, experiments and tutorials. Join the community where it already shares its experience.
Join the forum ↗