Release Highlights

• Improved implementations:
  • Victron
  • Shelly
  • FENECON Home 6, 10 & 15, Commercial 50, 92 & 100
  • RRD4j
  • Hardy Barth
  • Mennekes
  • Controller.IO.ChannelSingleThreshold
  • Bosch.BPTS5Hybrid:
• UI improvements:
  • New tree-based navigation is shaping
  • Time-of-Use-Tariff: support for Peak-Shaving mode
• Documentation improvements:
  • Improved Device & Service documentation and Docs navigation; example: https://openems.github.io/openems.io/openems/latest/edge/device_service.d/io.openems.edge.meter.carlo.gavazzi.html
  • Updated IntelliJ IDEA guide
• Core improvements:
  • For Energy Storage Systems
    • PID- and PT1-Filter improvements
    • ESS.Power: faster Power Distribution v2
  • E-Mobility new architecture (EVSE)
  • Central location for grid buy & sell limits
  • TariffManager prepares for grid buy & grid sell tariffs
  • Support for grid-forming GenSet (as supported by FENECON Commercial 50 and 100)

Details

OpenEMS Edge

• Victron ESS: Refactor AC-in setpoint calculation by @Sn0w3y in https://github.com/OpenEMS/openems/pull/3584
• Bosch.BPTS5Hybrid: Update Jetty by @Sn0w3y in https://github.com/OpenEMS/openems/pull/3647
• FEMS Backports 2026-03-21 by @FENECON in https://github.com/OpenEMS/openems/pull/3624
  • Shelly Pro 3EM: implement App Commit
  • Shelly: add support for more devices Commit
  • ManagedSymmetricEss/GoodWe: refactor how (PID-)filter is applied Commit
  • EVSE Electric Vehicle: add configurable battery capacity Commit
  • Ess.Power: distribution prepare for different handlers Commit
  • FEMS App EWS Schönau: public release Commit
  • Meta: add gridBuyHardLimit() and gridSellHardLimit() Commit
  • Meta: improve Grid-Buy-Soft-Limit Commit
  • Add new TariffManager Commit
  • Add Time-of-Use Feed-In Tariffs Commit
  • ENTSO-E: refactor + prepare fetch via Backend Commit
  • FENECON Commercial 50/100: Genset Component Commit
  • Cycle Worker: add Log Verbosity Commit
  • Meta: Refactor Grid-Feed-In-Limit Commit
  • Vehicle: Add Battery Capacity to component config Commit
  • Vehicle: Add Battery Capacity to App and Switch Commit
  • JSCalendar: fix problem with two overlapping fallback tasks Commit
  • Managed(As|S)ymmetricEss cleanup Commit
  • _Property-Channels: fix duplicated channels of component in same bundle Commit
  • handleExecuteSystemCommandRequest for Docker Commit
  • ModbusTcp: fix timeout config Commit
  • App Center: App for FENECON Pro Hybrid 9-10 Commit
  • FENECON Commercial 100: Add GoodWe 100 Type Commit
  • Energy Scheduler v2: Model production curtailment in EnergyFlow Commit
  • Commercial 92 Cluster (Master): set default power strategy Commit
  • App Center: Vehicle fix install always Commit
  • RRD4j: improve handling of unused files Commit
  • GoodWe and Kdk Grid-Meter Apps Commit
  • FENECON Commercial 50 VDE4110 Commit
  • App Center: fix scheduler order for switch EVSE/EVCS Commit
  • App Center: improve switching between EVCS and EVSE Commit
  • Hardy Barth: fix properties of second charge point Commit
  • EVSE: improve calculation of combined abilities Commit
  • Meta MaximumGridFeedInLimit & HardyBarth NPE Commit
  • EVSE Switch App: synchronize Apps with Backend after Fallback Commit
  • FENECON Home 6,10 (Gen2) & 15: "dynamischer Rundsteuerempfänger" Commit
• Controller.IO.ChannelSingleThreshold: add configurable fallback for undefined state by @janklostermann in https://github.com/OpenEMS/openems/pull/3646
• Controller.Ess.GridOptimizedCharge: fix IndexOutOfBoundsException in DelayCharge.calculateAvailEnergy by @rishabhvaish in https://github.com/OpenEMS/openems/pull/3645
• Add ManagedEvcsCluster, make ESS optional, configurable guaranteed charge power by @chpoulter in https://github.com/OpenEMS/openems/pull/3084
• Bosch.BPTS5Hybrid: refactor to HttpBridge by @Sn0w3y in https://github.com/OpenEMS/openems/pull/3650
• Victron: fix link to source code in readme.adoc by @janklostermann in https://github.com/OpenEMS/openems/pull/3630
• FEMS Backports 2026-03-28 by @FENECON in https://github.com/OpenEMS/openems/pull/3660
  • Ess.Power: add tree map solver to PowerDistribution v2 Commit
  • EVSE Mennekes: Improvements Commit
  • AppCenter: i18n for links Commit
  • FENECON Commercial 92: enable deinstallation of SelfConsumptionOptimization Commit
  • App.Evcs.HardyBarth: use Correct Alias for second CP Commit
  • Mennekes EVSE Implementation Commit
  • FENECON Commercial 50/100: Genset bugfixes Commit

OpenEMS UI

• Local UI: Use browser Language as Default by @da-Kai in https://github.com/OpenEMS/openems/pull/3415
• AppComponent: fix missing onActivate method (#3591) by @rishabhvaish in https://github.com/OpenEMS/openems/pull/3597
• FEMS Backports 2026-03-21 by @FENECON in https://github.com/OpenEMS/openems/pull/3624
  • New Navigation: desktop tree view Commit
  • EVSE: show charge power Commit
  • SoH Cycle Controller: show ESS Modal Commit
  • Time-of-Use-Tariff: show Peak-Shaving mode [Commit](https://github.com/OpenEMS/openems/commit/ cf62ec605bbd2cfc5d840d65edf1920e9fbe66e4)
  • Add support for JSCalendar Scheduler Commit
  • NUI: align tree view to top Commit
  • NUI: Refactor production Commit
  • SoH-Controller: fix channel subscribe Commit
  • fix subscribe bug Commit
  • Fix missing User.language Commit
  • remove duplicated evcss in consumption Commit
  • fix NPE in global route change handler Commit
  • fix app oauthcallback Commit
  • fix local OpenEMS login Commit
  • Fix Formly Navigation Commit
  • fix for chart height Commit
  • Improve state handling & websocket reconnect Commit
  • add missing assignment for filteredEdges Commit
  • Cleanup Commit
  • fix develop UI tests Commit
• FEMS Backports 2026-03-28 by @FENECON in https://github.com/OpenEMS/openems/pull/3660
  • NUI Refactor heatpump Commit
  • Fix formly-field-navigation Commit
  • Forecast Charts: improve readability with dashed lined Commit
  • fix tree navi Commit
  • OAuth: fix compatibility with iOS Commit
  • JSCalendar + EVSE + NUI improvements Commit
  • EnergyMonitor: Icon for Genset Commit
  • WsData: remove requiredMinState from request object Commit

OpenEMS Backend

• Docker: publish backend-edge image by @da-Kai in https://github.com/OpenEMS/openems/pull/3619
• Docker: fix build; update default ports by @da-Kai in https://github.com/OpenEMS/openems/pull/3622
• FEMS Backports 2026-03-21 by @FENECON in https://github.com/OpenEMS/openems/pull/3624
  • Migrate odoo to use http bridge Commit
  • improve timedata querys Commit
  • Alerting: Extend logging Commit
  • Docker: fix build; update default ports Commit

Common/General

• Implement Java ContextLogger; Improve logger by @da-Kai in https://github.com/OpenEMS/openems/pull/3590
• Update IntelliJ IDEA setup guide for OpenEMS by @alexbelkedev in https://github.com/OpenEMS/openems/pull/3600
• FEMS Backports 2026-03-21 by @FENECON in https://github.com/OpenEMS/openems/pull/3624
  • Gradle: standardize Wrapper Structure Commit
• Add Ona devcontainer environment setup by @Jan-ebb in https://github.com/OpenEMS/openems/pull/3643
• Update README files by @sfeilmeier in https://github.com/OpenEMS/openems/pull/3649
• FEMS Backports 2026-03-28 by @FENECON in https://github.com/OpenEMS/openems/pull/3660
  • Migrate from JUnit 4 to JUnit 6 Jupiter Commit

Version Upgrades

• Bump basic-ftp from 5.1.0 to 5.2.0 in /ui by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3592
• Bump actions/download-artifact from 7 to 8 in /.github/workflows by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3593
• Bump actions/upload-artifact from 6 to 7 in /.github/workflows by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3594
• Bump @angular/core from 20.3.16 to 20.3.17 in /ui by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3598
• Bump the openems-ui group across 1 directory with 28 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3599
• Bump the fastexcel group in /cnf with 2 updates by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3606
• Bump @hono/node-server from 1.19.9 to 1.19.10 in /ui by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3604
• Bump hono from 4.11.10 to 4.12.5 in /ui by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3603
• Bump immutable from 5.1.4 to 5.1.5 in /ui by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3605
• Bump org.mockito:mockito-core from 5.21.0 to 5.22.0 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3607
• Bump net.bytebuddy:byte-buddy from 1.18.5 to 1.18.7 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3608
• Bump com.google.protobuf:protobuf-java from 4.33.5 to 4.34.0 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3609
• Bump org.apache.felix:org.apache.felix.http.jetty12 from 1.1.6 to 1.1.8 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3610
• Bump docker/setup-qemu-action from 3 to 4 in /.github/workflows by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3611
• Bump docker/setup-buildx-action from 3 to 4 in /.github/workflows by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3612
• Bump docker/metadata-action from 5 to 6 in /.github/workflows by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3613
• Bump docker/login-action from 3 to 4 in /.github/workflows by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3614
• Bump docker/build-push-action from 6 to 7 in /.github/workflows by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3615
• Update to Gradle 9.4.0 by @sfeilmeier in https://github.com/OpenEMS/openems/pull/3621
• Update to Gradle 9.4.1 by @sfeilmeier in https://github.com/OpenEMS/openems/pull/3648
• Bump black from 24.10.0 to 26.3.1 in /tools/integration_tests by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3620
• Bump hono from 4.12.5 to 4.12.7 in /ui by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3618
• Bump org.mockito:mockito-core from 5.22.0 to 5.23.0 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3628
• Bump de.bytefish:pgbulkinsert from 8.1.8 to 9.0.0 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3627
• Bump com.auth0:auth0 from 3.2.0 to 3.3.0 in /cnf in the auth0 group by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3626
• Bump com.squareup.okio:okio-jvm from 3.16.4 to 3.17.0 in /cnf in the squareup group by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3625
• Bump org.jetbrains.kotlin:kotlin-osgi-bundle from 2.3.10 to 2.3.20 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3644
• Bump biz.aQute.bnd:biz.aQute.bnd.gradle from 7.2.1 to 7.2.3 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3654
• Bump com.google.protobuf:protobuf-java from 4.34.0 to 4.34.1 in /cnf by @dependabot[bot] in https://github.com/OpenEMS/openems/pull/3655

New Contributors

• @rishabhvaish made their first contribution in https://github.com/OpenEMS/openems/pull/3597
• @Jan-ebb made their first contribution in https://github.com/OpenEMS/openems/pull/3643

Full Changelog: https://github.com/OpenEMS/openems/compare/2026.3.0...2026.4.0