evcc Loadpoint Integration in OpenEMS / FENECON FEMS

[deadrabbit87]

Hi,
@iseeberg79 and I have been working on a read-only integration that makes evcc loadpoint data available as meter components in OpenEMS. We've submitted a PR to the OpenEMS project: #3553.

I've already started a discussion also in the OpenEMS Forum: https://community.openems.io/t/evcc-integration-as-read-only-evcs/10724

If you want a quick merge, any comments in the OpenEMS Forum would be appreciated.

Why is this relevant for evcc users?

If you're running evcc alongside OpenEMS, the charging consumption of your loadpoints currently doesn't show up in the OpenEMS energy flows and history. Our integration bridges that gap by reading loadpoint data from the evcc API and exposing it as standard OpenEMS meter components. This means your wallbox consumption is properly accounted for in the overall energy balance — no more "invisible" loads.

What it does:

• Reads loadpoint data (power, voltage, current, energy, vehicle info, plug state, active phases) via the evcc HTTP API
• Provides both a 3-phase and a single-phase meter component to match different wallbox setups
• Matches loadpoints automatically by title with an index-based fallback
• Read-only — it does not interfere with evcc's charging logic in any way

This may also become relevant for FENECON FEMS users:

Since FEMS (FENECON Energy Management System) is based on OpenEMS, this integration could in the future also benefit users who run FEMS as their primary energy management system alongside evcc. Once the integration is part of the OpenEMS codebase, it would be a natural candidate for inclusion in FEMS as well — giving FEMS users a clean way to see their evcc-managed wallbox consumption directly in their FEMS dashboard and energy history.

Current status:

We've been testing the integration over the past weeks and it has been working reliably. The PR is submitted and awaiting review on the OpenEMS side.

We'd also like to hear from evcc users: Are there specific data points or use cases you'd like to see covered in this kind of integration? We have additional branches with different approaches (e.g. directly reading cumulative energy values from MID-certified wallbox meters) and are open to expanding the integration based on community feedback.

Happy to discuss any questions or suggestions!

[iseeberg79]

There is not very much feedback. yet. For those of you, using OpenEMS or FEMS, isn't it interesting? It isn't worth the effort of implementation and no chance of integration without your feedback.

[merlinste]

It’s interesting to me - i am running FEMS on a regular Fenecon system. So I would be happy to take advantage of an implementation, but can’t do much by myself as FEMS does not allow much as a standard-user.