Release Highlights

• Improved implementations:
  • OpenDTU
  • Huawei PV-Inverter & PV-Inverter
  • SolarEdge ESS PV hybrid inverters
  • CHINT DDSU666 & DTSU666 meter
  • SOCOMEC e47/48 meter
  • KACO Battery Inverter
  • FENECON Energy Storage Systems
  • IO Weidmueller UR20
  • Hardy Barth Wallbox
  • Askoma Heating Element
  • Swisspower Time-Of-Use-Tariff
  • Controller ESS Limit Total Discharge
  • Controller ESS Prepare Battery Extension
  • Controller Api Modbus
• UI improvements:
  • Work on New UI Navigation project ("NUI")
• Core improvements:
  • Add support for Grid-Sell Prices
  • Continued update of JUnit tests to Jupiter
  • Improvements to EnergyScheduler v2
  • Better support for IntelliJ IDEA
  • Add AI agent instructions and Skills

Details

OpenEMS Edge

• Implement OpenDTU meter by @sthhs in https://github.com/OpenEMS/openems/pull/3562
• ESS Limit Total Discharge – handle Hybrid ESS by @timo-schlegel in https://github.com/OpenEMS/openems/pull/3640
• Huawei Smart Logger and PV Inverter by @DerStoecki in https://github.com/OpenEMS/openems/pull/3545
• Huawei PV-Inverter: Code cleanup by @sfeilmeier in https://github.com/OpenEMS/openems/pull/3710
• OpenDTU Meter: Clean up code and implement ManagedSymmetricPvInverter by @sthhs in https://github.com/OpenEMS/openems/pull/3709
• Add support for SolarEdge ESS PV hybrid inverters by @timo-schlegel in https://github.com/OpenEMS/openems/pull/3571
• Adding edge meter package for chint ddsu666 by @ramaguruprakash in https://github.com/OpenEMS/openems/pull/3692
• Implmenet socomec e47/48 by @Sn0w3y in https://github.com/OpenEMS/openems/pull/3388
• Add DTSU666 support to Chint meter bundle by @tushabe in https://github.com/OpenEMS/openems/pull/3728
• Controller Api Modbus: Fix Modify Method by @tsicking in https://github.com/OpenEMS/openems/pull/3743
• Fix(Edge) Kaco BatteryInverter Sunspec Model Frequency: Unit by @TimStoecker in https://github.com/OpenEMS/openems/pull/3735
• FEMS Backports 2026-05-01 in https://github.com/OpenEMS/openems/pull/3708
  • [Edge] App Center: automatically updating config with dependencies Commit
  • [Edge] Controller.Ess.PrepareBatteryExtension: add status info while in reference cycle Commit
  • [Edge] IO.Weidmueller.UR20: Refactor module handling and dynamic channel management Commit
  • [Edge] App.Evcs.IesKeywatt: installable for Admin only Commit
  • [Edge] GoodWe: Add Warning State whenever the GridMode becomes Undefined Commit
  • [Edge] Hardy Barth Wallbox: Use different limit set method Commit
  • [Edge] Energy Scheduler v2: Add Grid-Sell Prices Commit
  • [Edge] Evse.ChargePoint.Mennekes: change SetPoint to Watt Commit
  • [Edge] IOC.Fenecon.MasterBox Commit
  • [Edge] Heat.Askoma: schedule modes with JSCalendar Commit
  • [Edge] QuarterlyValues: fix NPE in toString-Method Commit
  • [Edge] Core.Sum: Optimizations Commit
  • [Edge] TimeOfUseTariff.Swisspower: update API url Commit
  • [Edge] GoodWe: fix internal filter limits for DC setpoint Commit
• FEMS Backports 2026-05-15 in https://github.com/OpenEMS/openems/pull/3729
  • [Edge] GenerateTargetsFromReferences: improve docs Commit
  • [Edge] Controller.Ess.PrepareBatteryExtension: fix capacity expansion reference cycle got stuck Commit
  • [Edge] Energy Component: implement JsonRpc GetSchedule Commit
  • [Edge] Core.Energy Simulator: shift prices to avoid misbehaviour with negative prices Commit
  • [Edge] FENECON Commercial 92 App: fix meter dependency Commit
  • [Edge] EnergyScheduler v2: Fitness Refactoring Commit
  • [Edge] Add new unit types and test helper methods Commit
  • [Edge] GoodWe.Grid-Meter: read serial number Commit
  • [Edge] Implement battery firmware update and enhance protection logic Commit
  • [Edge] App Center: systemd network settings via App Commit
  • [Edge] Ess.Generic.ManagedSymmetric: Add ess fault due to battery/inverter faults Commit

OpenEMS UI

• FEMS Backports 2026-05-01 in https://github.com/OpenEMS/openems/pull/3708
  • [UI] NUI: refactor heating element Commit
  • [UI] fix screenorientation not available Commit
  • [UI] EVSE App Center: add link to create Vehicle App Commit
  • [UI] Evse.ChargePoint.Mennekes: add chargepoint image Commit
  • [UI] NUI: Controller.Ess.FixActivePower Commit
  • [UI] add sumstate to every page Commit
  • [UI] Lock rotation on mobile and Tablet Commit
  • [UI] NUI: refactor time of use tariff Commit
• FEMS Backports 2026-05-15 in https://github.com/OpenEMS/openems/pull/3729
  • [UI] Fix Heatingelement history not showing Commit
  • [UI] Remove extra value in grid modal (new and old UI) Commit
  • [UI] Update android.compileSdkVersion Commit
  • [UI] Refactor Storage Commit
  • [UI] fix wrong title for App Center Commit
  • [UI] Askoma Heat Commit
  • [UI] NUI: Controller.ChannelThreshold Commit

OpenEMS Backend

• FEMS Backports 2026-05-01 in https://github.com/OpenEMS/openems/pull/3708
  • [Backend] User Settings of type JsonObject or String Commit
• FEMS Backports 2026-05-15 in https://github.com/OpenEMS/openems/pull/3729
  • [Backend] Alerting: Update JUnit tests Commit

Common/General

• Add documentation for running the prebuilt UI to the Getting Started guide by @mzenker in https://github.com/OpenEMS/openems/pull/3702
• Fix link to GermanDSO.java in timeofusetariff.entsoe/readme.adoc by @janklostermann in https://github.com/OpenEMS/openems/pull/3713
• Update modbus device template to new reference target system by @simon-lgb in https://github.com/OpenEMS/openems/pull/3717
• fix documentation structure and links for UI. by @mzenker in https://github.com/OpenEMS/openems/pull/3712
• FEMS Backports 2026-05-01 in https://github.com/OpenEMS/openems/pull/3708
  • [Common] CI: Add sonarqube scans Commit
  • [Common] CI: update sonarqube and gradle Commit
  • [Common] Tools: fix build-debian-package script if git repo is dirty Commit
• FEMS Backports 2026-05-15 in https://github.com/OpenEMS/openems/pull/3729
  • [Common] IntelliJ IDEA run configurations Commit
  • [Common] Fix CI build Commit
  • [Common] Add AI agent instructions and Skills Commit
  • [Common] CI: Fix Android Kotlin build Commit
  • [Common] Gradle: Migrate Groovy to Kotlin DSL Commit

Version Upgrades

• Bump softprops/action-gh-release from 2 to 3 in /.github/workflows by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3684
• Bump pytest from 8.4.1 to 9.0.3 in /tools/integration_tests by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3676
• Bump the openems-ui group across 1 directory with 30 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3698
• Bump com.auth0:jwks-rsa from 0.23.1 to 0.24.0 in /cnf in the auth0 group by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3719
• Bump org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm from 1.10.2 to 1.11.0 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3730
• Bump urllib3 from 2.6.3 to 2.7.0 in /tools/integration_tests by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3726
• Bump requests from 2.32.4 to 2.34.2 in /tools/integration_tests in the openems-integration-tests group by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3734
• Bump the auth0 group in /cnf with 2 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3733
• Bump the pax-logging group in /cnf with 2 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3732
• Bump idna from 3.10 to 3.15 in /tools/integration_tests by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3736
• Bump the fastexcel group in /cnf with 2 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3738
• Bump the junit group across 1 directory with 5 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3739
• Bump com.google.protobuf:protobuf-java from 4.34.1 to 4.35.0 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3741
• Bump com.auth0:auth0 from 3.5.1 to 3.6.0 in /cnf in the auth0 group by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3745
• Bump org.apache.felix:org.apache.felix.http.jetty12 from 1.1.8 to 1.1.10 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3747
• Bump com.auth0:auth0 from 3.6.0 to 3.7.0 in /cnf in the auth0 group by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3749

New Contributors

• @mzenker made their first contribution in https://github.com/OpenEMS/openems/pull/3702
• @ramaguruprakash made their first contribution in https://github.com/OpenEMS/openems/pull/3692
• @tushabe made their first contribution in https://github.com/OpenEMS/openems/pull/3728

Full Changelog: https://github.com/OpenEMS/openems/compare/2026.5.0...2026.6.0