April 2026 monthly summary for evcc-io/evcc focusing on clarity, security, and reliability improvements across core areas. Key features delivered include a Home Automation Configuration Refactor to rename the Home property to Home_ for future-proofing, OAuth2 Authentication Registry Modernization to simplify token management, and Vehicle Start/Stop Service Enhancement to streamline service calls and improve reliability. A notable bug fix addressed GoodWe Inverter YAML Templates by removing deprecated parameters to prevent misconfiguration. These changes reduce maintenance burden, improve integration readiness with Home Assistant, and strengthen authentication and vehicle control workflows, delivering measurable business value and technical robustness across home automation, authentication, and vehicle/inverter support.

March 2026 (evcc-io/evcc) monthly summary: Focused on reliability, observability, and safe deprecation to reduce risk and drive business value. The team delivered targeted features, fixed high-impact bugs across core integrations, and enhanced logs for better traceability. Key features delivered: SGReady: improved logging and clearer messages; general logging enhancements for better traceability; routine maintenance and upgrades of modules; deprecation of legacy APIs/features to reduce technical debt. Major bugs fixed: Deprecation warnings cleaned up; stability fixes across grid integrations (fox-ess-h3-smart revert), Zendure power/SOC limits, improved password handling; SGReady panic fix; optimizer robustness (infeasible errors, invalid battery capacity, result timestamps); broken Nexblue integration removed; HTTP 404 handling corrected; several data panic and misbehavior issues corrected; Teslamate battery_level revert and OVMS climater revert addressed. Overall impact and accomplishments: Improved system reliability and observability with safer deprecation paths, reduced risk of escalations, and more predictable energy management behavior. The codebase is more maintainable with cleaner logs, better error handling, and safer integration state transitions. Technologies/skills demonstrated: Go-based code maintenance, enhanced logging instrumentation, robust error handling in optimization flows, integration stability across multiple hardware products, and proactive deprecation and module upgrade practices.

February 2026 highlights for evcc-io/evcc: - Key features delivered: - Graceful Ctrl-C handling: improved CLI and server shutdown to allow graceful termination, reducing risk of corruption and improving operator experience. Commits: 8d350a7a65645ecb675da7d5623194e8e1aa54c3; f5149861432b8c93d3a0b6e08d46a71b9974dcf0. - Add Glen Dimplex WPM feature: new capability expanding supported hardware and control options. Commit: 23a1118e37e4dadafc51a8d4cdd9bdfe686d564f. - Templates: storageunit battery-only (BC): enables battery-only operation mode for storageunit templates, improving energy management flexibility. Commit: 154790c5e31b245fe0731264d050895ba1d1a0b8. - Dependency upgrades: updated modules and Go version to latest supported, improving security, performance, and compatibility. Commits: 1cf73a8f091db81df0741d7351af2d5b582b2cbf; 73713561df5482d1d2ac3ea736bd2d85a3ed734e. - System maintenance and code cleanup: ongoing cleanup and consistency improvements to reduce tech debt and improve maintainability. - Major bugs fixed: - Vehicle validation bug: enforced valid inputs to prevent misconfiguration and runtime errors. Commit: a6f17db502a6098056e7a7016254cffcd87425f7. - Error handling improvements and HTTP status checks: general error handling hardening and surfacing of HTTP errors to clients. Commits: 2f42fd71bea86028349c503b15030753da166aa3; 201b93fd32db36153e2400157e9fa275a7791890. - Mqtt: fix panic publishing nil interface: addressed a panic scenario in MQTT publish path. Commit: c69c7672bd485d7e0744e5c06e0a77352ae4468c. - Stecker deprecation rollback: reverted a prior deprecation to restore previous Stecker behavior for compatibility. Commits: 45156ceea1dcdf044d2dbed8487c9bde500ffcfc; 11006143514141cc9fb30df24f2b52b6dcda9cd2 (deprecate). - RTC: Restore Default Port Behavior: fixed port handling to restore expected connectivity. Commit: 20134a5bf698171c45af9618285cd4f35027cea8. - Demo/CSS cleanup and deprecation: unpersist demo and CSS assets and mark deprecated where applicable, reducing legacy maintenance burden. Commits: ca395b7c1f07ad826574c60f437b04bb96bcaad6; e2c8d2ed3713f77fbd8dc04d7756d73fa4ec4630. - Code formatting and minor cleanup: formatting and small cleanups to improve readability and consistency. Commits: 59054ab7a9da81814c09cf974254ee8e5d1947e9; 287598f66d40b94ce06181398b9f1342628e5525; 0dc75d9348388edc5af906a6572a927ad9c86607. - General simplifications and code cleanup: broad simplifications across modules to reduce complexity. Commit: f3de6d63f248a5b8b1ab8eb1b3b655fc84b0a15e. - Mqtt: fix panic publishing nil interface: already captured above; included for completeness. - Overall impact and accomplishments: - Increased reliability and operator safety through graceful shutdowns and hardened error handling. - Reduced technical debt via systematic code cleanup, formatting improvements, and deprecation management. - Improved risk posture and future readiness with dependency upgrades and Go version update. - Enhanced business value through safer deployments, clearer error signaling, and broader hardware support. - Technologies/skills demonstrated: - Go language proficiency, module and dependency management, and version upgrades. - Robust error handling, HTTP status verification, and fault-tolerant shutdown patterns. - Systematic code cleanups, naming consistency, and documentation of feature changes. - Maintenance discipline: deprecation planning and rollback, feature toggling, and templates customization.

January 2026 (2026-01) monthly summary for evcc (evcc-io/evcc). Focused improvements across features, integrations, and reliability to drive business value and reduce runtime risk. Delivered tangible features, resolved high-impact bugs, and advanced code quality, testing, and security postures to enable more predictable deployment and easier future enhancements. Key features delivered: - Template agent integration: Added template agent to the system to enable templated deployments and faster onboarding of new configurations (commit df5bf5f452b10c746a1cb591ec4c748388c1d238). - MBMD battery capabilities: Added missing MBMD battery capabilities for better device interoperability and richer monitoring (commit 966b321219d090f3b0b88fadfebe2a4ad577bd51). - License and policy clarification: Clarified license wording and policy to reduce compliance risk (commit a4d704164b284129ef9279c8917152a455cc78c5). - EnergyForecast: Market zone support: Introduced Market Zone support to broaden regional data applicability (commit aa2e55c7a3d658917d7f2b7c433bbbed05923f6b). - Enphase: HTTPS by default: Configured Enphase protocol to use HTTPS by default for improved security (commit ea8969260eb04612b56e722d04dcfb344a4a334c). - Planner debugging and heating config: Enhanced planner debugging capabilities and added heating configuration for better diagnosability and control (commits cd8d828c5276f6d254a1f1be102b280fe40262ed, f5c690b1230ee8f05c3e377843fa70c2a729fd64). - Codebase maintenance and modernization: Ongoing modernization and maintenance to stabilize the foundation (multiple commits including 73e1a53768616582bc9493e4c808d38b6ccb6e5c and 90ffd8f8c22ca65110b02a92fdaf0c9ab41cfbc4). Major bugs fixed: - Compile error on empty required parameter: Fixed build/runtime issue when an empty required param is provided (commit 109eaeb696b2d988c6d4c82c0c7f837a2b10349b). - effectiveMaxPower correctness: Ensured effectiveMaxPower returns the correct vehicle value (commit aa9723b32354efdf4022c2a7bbfa3e5008729d55). - Charger timer: Corrected charger timer behavior for Compleo (commit 57922028790a03057f7d5e9383a3ef637cbf25d0). - Deprecated parameters: Restored support for missing deprecated parameters to maintain backward compatibility (commit c335df19fcc5d2fa49e6a0196389de70380ee956). - EEBUS: ignore invalid phases: Fixed to ignore invalid EEBUS phases to prevent misbehavior (commit 854d0a83c1c5999b17e496122959580be383d701). - Temperature readings: Daikin temperature readings corrected (commit f12512a6dca79a238ddc1db92f28ed034263b750). - Power handling: Ochsner power calculation improvements (commit c5ca432fa63d6a3504629f4952427e6e072013bd). - Test stability and fixes: Multiple test fixes to improve reliability after changes (commits 74cb3c7087fc1d1db732debd11c9b01ef87c4984 and 5ad9c7ea60b051bf07bbd627779f35d9a96ccefb). - MQTT and URI/error improvements: Preserve significant digits in MQTT processing; include URI in HTTP error messages for easier debugging (commit a7b965f9d460106597f87507cad21488aad23a09 and 40b8e35dac741e8d8fb242b87c9ac9bedd8a78f0). - URI cleansing and template/repo access: Robust handling for HomeAssistant URI cleansing and template/repository access improvements (commits d3d902ebd86987c9636a4540d8f613143372d025, 466a23d474c9d1a849a3f90742467f8e9296cfba, 766b314efeeb76819c598ee10b8e95ee1a24b5ca). - Miscellaneous test and compatibility fixes across integrations: Various fixes to test suites and compatibility layers (e.g., 76ca1ee836c1d4275c94189f2ea48e0bf5ab9fe9). Overall impact and accomplishments: - Strengthened reliability across core Evcc and integrations, reducing runtime errors and improving stability for downstream consumer deployments. - Improved backward compatibility and security posture, easing upgrade paths for users and operators. - Expanded capabilities (MBMD, EnergyForecast market zones) enabling broader device support and market data use cases. - Enhanced developer productivity through better debugging, error messaging, and codebase modernization. Technologies/skills demonstrated: - Code quality and refactoring discipline, dependency/module management, and system modernization. - Integration engineering across diverse protocols and devices (MBMD, EEBUS, Enphase, Daikin, Ochsner, SolarEdge, Sungrow, etc.). - Security hardening (HTTPS defaults), robust error handling, and improved test coverage for stability. - Debugging, tracing, and planner development for operational diagnostics and configuration control.

Summary for 2025-12: Overview: - Consolidated improvements across build performance, test stability, and integration reliability in evcc-io/evcc, delivering business value through faster CI, more robust features, and a cleaner codebase. Key features delivered: - Sungrow: enforce max charge power — added a cap on maximum charging power for Sungrow integration to improve safety, reliability, and predictability of EV charging behavior. - HTTP Caching Enhancements — introduced and exposed HTTP caching integration to reduce backend load and improve response times. - Build and cache optimizations — leveraged cache variables and Docker mod cache to shorten build times and improve asset build reliability. - Codebase maintenance and API improvements — refactors to sort registered types, rename symbols, improve GPIO API, lint improvements, and targeted internal tweaks to reduce surface area of breakages. - Dependency upgrades — upgraded core dependencies and modules to latest versions, increasing compatibility and build stability. - Testing improvements — expanded test coverage for private struct decoding, improved test stability and related tooling. Major bugs fixed: - Revert golangci-lint 2.5.0 fix — restores prior lint behavior to reduce CI noise and stabilize lint results. - Revert test coverage changes — rolled back recent coverage changes to maintain stable test expectations. - Planner compatibility fix — addressed backwards compatibility for Planner features, reducing risk of feature drift. Overall impact and accomplishments: - Improved system reliability and predictability for charging integrations, reduced CI/build times, and strengthened testing posture. The changes collectively enhance developer velocity, reduce risk during releases, and improve the end-user experience with more stable and faster features. Technologies/skills demonstrated: - Go and module management, lint tooling, and API design improvements. - Docker-based build optimizations and cache strategies. - Testing discipline with private struct decoding tests and stability hardening. - HTTP caching strategy integration and observable logging for easier troubleshooting.

During 2025-11, the evcc project focused on governance, maintainability, observability, and reliability improvements while stabilizing core functionality. Notable deliveries include deprecation of Solarwatt Manager flex, establishing experimental codeowners with governance protections, reorganizing the codebase for better maintainability, expanding test coverage, and introducing battery usage metrics to improve visibility and decision-making. These efforts strengthen reliability, onboarding, and readiness for modernization and dependency upgrades, while keeping momentum on platform stability.

October 2025 (evcc-io/evcc) delivered a focused set of reliability, privacy, and performance improvements across energy data, planning, tariffs, and data ingestion. The work improved data accuracy, resilience to transient errors, and privacy safeguards while strengthening observability and maintainability for faster iteration and safer deployments.

2025-09 evcc monthly summary: Focused on stability, performance, and observability across core EVCC functionality and vehicle integrations. Key features delivered include CI improvements with GitHub Actions caching and a safe revert path for checkout handling, comprehensive dependency upgrades for stability and compatibility, and optimizer enhancements (discharge strategy and handling of batteries with unknown capacity). Major bugs fixed address authentication robustness (VW login), cache integrity (Tariffs duplicate cache writes), and several integration panics (SMA energy meter energy scale revert, Polestar range/ODO panic, and related diagnostics). Observability was expanded with new metrics, and ongoing code quality work improved naming consistency and CLI capabilities. Overall impact: faster, more reliable CI cycles; safer energy optimization; improved data quality and monitoring; and a more maintainable codebase.

August 2025 focused on stabilizing error handling, improving observability, and delivering user-facing improvements that drive reliability and operational efficiency for evcc. Notable outcomes include targeted enhancements to diagnostics, energy monitoring, and deployment flexibility, alongside steady progress on optimizer stability and OCPP readiness. While implementing error context improvements, some error-handling changes were rolled back to prevent regressions, underscoring a disciplined approach to backward compatibility while continuing to evolve the error model.

July 2025 monthly work summary for itchyny/go-yaml. Focused on code health improvements in the YAML library and hardening of error reporting to improve developer experience and runtime diagnostics. This period delivered a cleaner codebase, clearer error surfaces, and a foundation for easier future maintenance and feature work.

June 2025 monthly summary for evcc-io/evcc: focus on data accuracy and stability with bug fixes targeting current data handling and loadpoint limits. No new user-facing features delivered this month; priority was to stabilize critical data paths and ensure reliable operation of charging station integrations. Reworks were conducted with rollback planning to maintain system integrity, preparing for a safer rework in future iterations.