EEBus: clamp the curtailment percent to the documented maximum (#33300)

hems/eebus/eebus.go

@@ -393,7 +393,8 @@ func (c *EEBus) CurtailedPercent() *int {
 
 	percent := 100
 	if limitActive(c.productionLimitActivated) {
-		percent = int(c.effectiveProductionLimit() / c.productionNominalMax * 100)
+		// the EG may state a limit above the nominal production power
+		percent = min(int(c.effectiveProductionLimit()/c.productionNominalMax*100), 100)
 	}
 
 	return &percent

hems/eebus/eebus_test.go

@@ -325,6 +325,21 @@ func TestProductionLimit_FailsafeUnconfigured(t *testing.T) {
 	assert.Equal(t, 0.0, *power)
 }
 
+// TestCurtailedPercent_AboveNominal verifies a limit above the nominal production
+// power reports 100%, not more - api.HEMS documents the percent as 0..100 and it
+// reaches the inverter unchecked.
+func TestCurtailedPercent_AboveNominal(t *testing.T) {
+	c := newTestEEBus(t)
+	c.heartbeat.Set(struct{}{})
+	c.productionLimit = ucapi.LoadLimit{Value: -2 * testProductionNominal, IsActive: true}
+
+	require.NoError(t, c.run())
+
+	percent := c.CurtailedPercent()
+	require.NotNil(t, percent)
+	assert.Equal(t, 100, *percent)
+}
+
 // TestMaxProductionPower verifies the api.HEMS export cap is a positive wattage,
 // while LPP states its limits as negative watts.
 func TestMaxProductionPower(t *testing.T) {