From eea15dc944cc835dd0222dd23c9c978832a35da7 Mon Sep 17 00:00:00 2001
From: andig <andi@evcc.io>
Date: Sun, 2 Nov 2025 17:16:19 +0100
Subject: [PATCH] Add dimming of meters (#24978)

---
 core/site.go          |  4 ++++
 core/site_circuits.go | 35 +++++++++++++++++++++++++++++++++++
 meter/eebus.go        |  2 +-
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/core/site.go b/core/site.go
index 3199d3455..24c4e273d 100644
--- a/core/site.go
+++ b/core/site.go
@@ -940,6 +940,10 @@ func (site *Site) update(lp updater) {
 		}
 
 		site.publishCircuits()
+
+		if err := site.dimMeters(circuitDimmed(site.circuit)); err != nil {
+			site.log.ERROR.Println(err)
+		}
 	}
 
 	// prioritize if possible
diff --git a/core/site_circuits.go b/core/site_circuits.go
index 1a6305417..ee0e2b6f5 100644
--- a/core/site_circuits.go
+++ b/core/site_circuits.go
@@ -1,6 +1,11 @@
 package core
 
 import (
+	"errors"
+	"fmt"
+	"slices"
+
+	"github.com/evcc-io/evcc/api"
 	"github.com/evcc-io/evcc/core/keys"
 	"github.com/evcc-io/evcc/util/config"
 	"github.com/samber/lo"
@@ -43,3 +48,33 @@ func (site *Site) publishCircuits() {
 
 	site.publish(keys.Circuits, res)
 }
+
+func (site *Site) dimMeters(dim bool) error {
+	var errs error
+
+	for _, dev := range slices.Concat(site.auxMeters, site.extMeters) {
+		m, ok := dev.Instance().(api.Dimmer)
+		if !ok {
+			continue
+		}
+
+		if dimmed, err := m.Dimmed(); err == nil {
+			if dim == dimmed {
+				continue
+			}
+		} else {
+			if !errors.Is(err, api.ErrNotAvailable) {
+				errs = errors.Join(errs, fmt.Errorf("%s dimmed: %w", dev.Config().Name, err))
+			}
+			continue
+		}
+
+		if err := m.Dim(dim); err == nil {
+			site.log.DEBUG.Printf("%s dim: %t", dev.Config().Name, dim)
+		} else if !errors.Is(err, api.ErrNotAvailable) {
+			errs = errors.Join(errs, fmt.Errorf("%s dim: %w", dev.Config().Name, err))
+		}
+	}
+
+	return errs
+}
diff --git a/meter/eebus.go b/meter/eebus.go
index 274df765b..2455429bd 100644
--- a/meter/eebus.go
+++ b/meter/eebus.go
@@ -275,7 +275,7 @@ func (c *EEBus) Dim(dim bool) error {
 	defer c.mu.Unlock()
 
 	if c.egLpcEntity == nil {
-		return errors.New("not connected")
+		return api.ErrNotAvailable
 	}
 
 	if !slices.Contains(c.eg.EgLPCInterface.AvailableScenariosForEntity(c.egLpcEntity), 1) {