More config and fix test

config.yaml.dist

@@ -47,4 +47,5 @@ control:
   # I'm not sure how well the batteries like being set to discharge and stop every 5s so I think you do not want to change this below 30s.
   loop-interval: 30
   minimum-solar-over-production: 10 # Minimum percentage solar over production. This is the percentage of unused power.
-  over-discharge-percentage: 3 # What percentage to over discharge. Handy for spikes in energy usage
+  over-discharge-percentage: 3 # What percentage to over discharge. Handy for spikes in energy usage.
+  minimum-battery-capacity: 5 # Minimum capacity to leave in the batteries.

control/control.go

@@ -17,6 +17,7 @@ type Config struct {
 	Run bool `mapstructure:"run"`
 	MinimumSolarOverProduction int `mapstructure:"minimum-solar-over-production"`
 	OverDischargePercentage int `mapstructure:"over-discharge-percentage"`
+	MinimumBatteryCapacity int `mapstructure:"minimum-battery-capacity"`
 }
 
 type Control struct {
@@ -173,7 +174,7 @@ func (c *Control) Start() {
 
 				for _, battery := range batteries {
 					if wattsRequired > 0 {
-						if battery.capacity > 5 {
+						if battery.capacity > float64(c.config.MinimumBatteryCapacity) {
 							var useWatts uint
 							if wattsRequired > 5000 {
 								useWatts = 5000

metrics/metrics_test.go

@@ -36,7 +36,7 @@ func TestSet(t *testing.T) {
 		t.Fatalf("Metric not found")
 	}
 
-	if metric.Values[0].Value != 1.0 {
+	if metric.Values[0].Values[0] != 1.0 {
 		t.Fatalf("Incorrect value")
 	}
 }