From df5dc0e74f1db4cb9ed5fa9cb66b73d17935941b Mon Sep 17 00:00:00 2001
From: andig <andi@evcc.io>
Date: Sun, 12 Jul 2026 19:07:18 +0200
Subject: [PATCH] EEBus: ignore IEC61851 default current limits, honor
 loadpoint minCurrent (#31737)

---
 charger/eebus-evse.go | 10 ++++++++++
 charger/eebus_test.go | 45 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/charger/eebus-evse.go b/charger/eebus-evse.go
index 862db08df..43f608aa3 100644
--- a/charger/eebus-evse.go
+++ b/charger/eebus-evse.go
@@ -566,6 +566,16 @@ func (c *EEBus) minMax() (minMax, error) {
 		return zero, nil
 	}
 
+	// IEC61851 EVs can't report their current range, so the EVSE sends generic
+	// defaults (6/16A) that would override the loadpoint config; trust ISO only (#14418)
+	switch comStandard, err := c.cem.EvCC.CommunicationStandard(evEntity); {
+	case err != nil:
+		return zero, eebus.WrapError(err)
+	case comStandard != model.DeviceConfigurationKeyValueStringTypeISO151182ED1 &&
+		comStandard != model.DeviceConfigurationKeyValueStringTypeISO151182ED2:
+		return zero, api.ErrNotAvailable
+	}
+
 	minLimits, maxLimits, _, err := c.cem.OpEV.CurrentLimits(evEntity)
 	if err != nil {
 		return zero, eebus.WrapError(err)
diff --git a/charger/eebus_test.go b/charger/eebus_test.go
index c1dd77040..950069bc2 100644
--- a/charger/eebus_test.go
+++ b/charger/eebus_test.go
@@ -442,3 +442,48 @@ func TestEEBusCurrentPower_Elli(t *testing.T) {
 	require.NoError(t, err)
 	assert.Equal(t, 4002.0, power)
 }
+
+// minMax must only trust EV current limits under ISO15118; IEC61851 EVs
+// report EVSE defaults that would override the loadpoint config (#14418).
+func TestEEBusMinMaxCommunicationStandard(t *testing.T) {
+	for _, tc := range []struct {
+		name     string
+		standard model.DeviceConfigurationKeyValueStringType
+		iso      bool
+	}{
+		{"iec", model.DeviceConfigurationKeyValueStringTypeIEC61851, false},
+		{"unknown", model.DeviceConfigurationKeyValueStringType("unknown"), false},
+		{"iso", model.DeviceConfigurationKeyValueStringTypeISO151182ED2, true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			evcc := mocks.NewCemEVCCInterface(t)
+			opev := mocks.NewCemOPEVInterface(t)
+			evEntity := spinemocks.NewEntityRemoteInterface(t)
+
+			eebus := &EEBus{
+				cem: &eebus.CustomerEnergyManagement{
+					EvCC: evcc,
+					OpEV: opev,
+				},
+				ev:  evEntity,
+				log: util.NewLogger("test"),
+			}
+
+			evcc.EXPECT().EVConnected(evEntity).Return(true)
+			evcc.EXPECT().CommunicationStandard(evEntity).Return(tc.standard, nil)
+
+			if tc.iso {
+				opev.EXPECT().CurrentLimits(evEntity).Return(opevLimits3p(6, 16, 0))
+			}
+
+			mm, err := eebus.minMax()
+			if tc.iso {
+				require.NoError(t, err)
+				assert.Equal(t, 6.0, mm.min)
+				assert.Equal(t, 16.0, mm.max)
+			} else {
+				require.ErrorIs(t, err, api.ErrNotAvailable)
+			}
+		})
+	}
+}