Release Highlights

• We celebrated 10 years of OpenEMS since the first hello-world commit
  • See blog post on https://openems.io/2026/04/24/10-years-of-openems/
  • Discuss at https://community.openems.io/t/10-years-of-openems/10828
• Improved implementations:
  • Mennekes Wallbox
  • FENECON Commercial 92 Cluster
  • FENECON Commercial 100
  • FENECON Mini
  • KACO Battery-Inverter
  • ASKOMA Heating Element
  • Shelly
• UI improvements:
  • New tree-based navigation is shaping
  • Localization for OEM distribution changelog
• Core improvements:
  • There is a new way to manage OSGi References by Component-ID. See Commit
  • Websocket ClientReconnectorWorker: circumvent possible deadlock Commit

Details

OpenEMS Edge

• FEMS Backports 2026-04-04 by @fenecon in https://github.com/OpenEMS/openems/pull/3667
  • [Edge] Simplify OSGi Reference by Component-ID: replace updateReferenceFilter Commit
  • [Edge] Websocket ClientReconnectorWorker: circumvent possible deadlock Commit
  • [Edge] JSCalendar: enforce an explicit Clock Commit
  • [Edge] Use TariffManager in Sum Commit
  • [Edge] Add Reference Cycle Support to Planned Battery Extension Commit
  • [Edge] GlobalOptimizationContext: fix possible NPE for no prices Commit
  • [Edge] JSCalendar: fix timezone handling Commit
  • [Edge] FENECON Commercial 100: App fix for always creating STS-Box Commit
  • [Edge] FENECON Commercial 100: Fix App for GenSet Commit
• FEMS Backports 2026-04-19 by @fenecon in https://github.com/OpenEMS/openems/pull/3688
  • [Edge] CycleWorker: measure execution times Commit
  • [Edge] FENECON Mini: implement App Commit
  • [Edge] EVSE: add Consumption to Excel export Commit
  • [Edge] Add documentation for EVSE Commit
  • [Edge] KACO Battery-Inverter: add ErrorRestartBehaviourConfig Commit
  • [Edge] Add Annotation for Config Channel Persistence Priority Commit
  • [Edge] [Debian] Store special log files for firmware updates in /var/log/openems Commit
  • [Edge] App.Heat.Askoma Write Commit
  • [Edge] PT1-Filter: fix apply low/high limits Commit
  • [Edge] ManagedSymmetricEss: improve how filter is applied Commit
  • [Edge] Mennekes EVSE: Cleanup isReadyForCharging handling Commit
  • [Edge] Commercial 92 Cluster: set default power strategy Commit
  • [Edge] App.Meter.Shelly.Meter: allow installation for owner Commit
  • [Edge] GridOptimizedCharge: Apply no limit when the grid feed-in limit is almost zero Commit
  • [Edge] Add Grid-Sell-Price to SumImpl Commit
  • [Edge] Migrate JUnit test cases Commit
  • [Edge] Goodwe update fixes Commit
  • [Edge] Extend ManagedSymmetricEss Modbus List by actual power value channels Commit
• [Edge] Controller.Evcs: fix awaitLastChanges checking INCREASING twice instead of DECREASING by @rishabhvaish in https://github.com/OpenEMS/openems/pull/3668

OpenEMS UI

• FEMS Backports 2026-04-04 by @fenecon in https://github.com/OpenEMS/openems/pull/3667
  • [UI] Fix system overview for installer accounts Commit
  • [UI] NUI: fix recreating new navigation nodes after empty navigationtree Commit
  • [UI] add missing channel subscribe for emergency reserve controller Commit
  • [UI] fix get edges infinite scroll list Commit
  • [UI] EVCS Read-Only: fix modal Commit
  • [UI] fix chartheight Commit
• FEMS Backports 2026-04-19 by @fenecon in https://github.com/OpenEMS/openems/pull/3688
  • [UI] Fix NumberUtils.divideSafely() Commit
  • [UI] various cleanups Commit
  • [UI] Adjust confirm button position on mobile Commit
  • [UI] General Improvements Commit
  • [UI] NUI: grid optimized charge Commit
  • [UI] JSCalendar: show tasks with no recurrenceRule Commit
  • [UI] GridOptimizedCharge: Visualisation for the new state Commit
  • [UI] fix heatpump history Commit
  • [UI] NUI: Refactor Heat Commit
  • [UI] Localization for changelog Commit
  • [UI] NUI: Improve new Widget navigation and fix help key Commit
  • [UI] Darkmode description colors Commit
  • [UI] fix history values Commit

OpenEMS Backend

• FEMS Backports 2026-04-19 by @fenecon in https://github.com/OpenEMS/openems/pull/3688
  • [Backend] Metadata.Odoo: configurable login user Commit
• Backend WebsocketServer: Reject invalid Apikey at handshake by @da-Kai in https://github.com/OpenEMS/openems/pull/3700

Common/General

• FEMS Backports 2026-04-04 by @fenecon in https://github.com/OpenEMS/openems/pull/3667
  • [Common] Gradle: avoid Mockito warning Commit
• Docker: Add attestations and sbom by @da-Kai in https://github.com/OpenEMS/openems/pull/3675
• Update setup-ide.adoc: removed consollino UI by @sjjh in https://github.com/OpenEMS/openems/pull/3690
• Update readme.adoc: typo by @sjjh in https://github.com/OpenEMS/openems/pull/3701

Version Upgrades

• Bump the bytebuddy group in /cnf with 2 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3665
• Bump pygments from 2.19.2 to 2.20.0 in /tools/integration_tests by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3662
• Bump codecov/codecov-action from 5 to 6 in /.github/workflows by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3656
• Bump com.auth0:auth0 from 3.3.0 to 3.4.0 in /cnf in the auth0 group by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3673
• Bump io.openems:j2mod from 3.3.0-openems.1 to 3.3.0-openems.2 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3683
• Bump com.google.guava:guava from 33.5.0-jre to 33.6.0-jre in /cnf in the guava group by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3682
• Bump org.apache.felix:org.apache.felix.scr from 2.2.14 to 2.2.18 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3685
• Bump org.bouncycastle:bcprov-jdk18on from 1.83 to 1.84 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3687
• Bump the pax-logging group in /cnf with 2 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3681
• Bump follow-redirects from 1.15.11 to 1.16.0 in /ui by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3677
• Bump org.jetbrains.kotlin:kotlin-osgi-bundle from 2.3.20 to 2.3.21 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3697
• Bump org.jsoup:jsoup from 1.22.1 to 1.22.2 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3696
• Bump com.google.code.gson:gson from 2.13.2 to 2.14.0 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3695
• Bump com.auth0:jwks-rsa from 0.23.0 to 0.23.1 in /cnf in the auth0 group by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3694
• Bump the influxdb group in /cnf with 4 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3693
• Bump the auth0 group in /cnf with 2 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3705
• Update to Gradle 9.5.0 by @fenecon in https://github.com/OpenEMS/openems/pull/3707

Full Changelog: https://github.com/OpenEMS/openems/compare/2026.4.0...2026.5.0