diff --git a/core/keys/site.go b/core/keys/site.go
index 63988eca64..4ffbb14714 100644
--- a/core/keys/site.go
+++ b/core/keys/site.go
@@ -4,7 +4,6 @@ const (
 	Aux                   = "aux"
 	AuxPower              = "auxPower"
 	Currency              = "currency"
-	Ext                   = "ext"
 	GreenShareHome        = "greenShareHome"
 	GreenShareLoadpoints  = "greenShareLoadpoints"
 	GridConfigured        = "gridConfigured"
@@ -30,6 +29,7 @@ const (
 	TariffPriceLoadpoints = "tariffPriceLoadpoints"
 	Vehicles              = "vehicles"
 	Circuits              = "circuits"
+	Ext                   = "ext"
 
 	// meters
 	GridMeter     = "gridMeter"
diff --git a/core/site.go b/core/site.go
index 7534f74ae6..1e1b2df0d2 100644
--- a/core/site.go
+++ b/core/site.go
@@ -434,17 +434,25 @@ func (site *Site) publishDelta(key string, val interface{}) {
 	site.publish(key, val)
 }
 
-func (site *Site) collectMeters(key string, meters []api.Meter) []meterMeasurement {
+// updatePvMeters updates pv meters. All measurements are optional.
+func (site *Site) updatePvMeters() {
+	if len(site.pvMeters) == 0 {
+		return
+	}
+
 	var wg sync.WaitGroup
-	mm := make([]meterMeasurement, len(meters))
+
+	mm := make([]meterMeasurement, len(site.pvMeters))
 
 	fun := func(i int, meter api.Meter) {
 		// power
 		power, err := backoff.RetryWithData(meter.CurrentPower, bo())
 		if err == nil {
-			site.log.DEBUG.Printf("%s %d power: %.0fW", key, i+1, power)
+			if power < -500 {
+				site.log.WARN.Printf("pv %d power: %.0fW is negative - check configuration if sign is correct", i+1, power)
+			}
 		} else {
-			site.log.ERROR.Printf("%s %d power: %v", key, i+1, err)
+			site.log.ERROR.Printf("pv %d power: %v", i+1, err)
 		}
 
 		// energy (production)
@@ -452,96 +460,171 @@ func (site *Site) collectMeters(key string, meters []api.Meter) []meterMeasureme
 		if m, ok := meter.(api.MeterEnergy); err == nil && ok {
 			energy, err = m.TotalEnergy()
 			if err != nil {
-				site.log.ERROR.Printf("%s %d energy: %v", key, i+1, err)
+				site.log.ERROR.Printf("pv %d energy: %v", i+1, err)
 			}
 		}
 
+		var excessDC float64
+		var excessStr string
+		if m, ok := meter.(api.MaxACPower); ok {
+			if dc := m.MaxACPower() - power; dc < 0 && power > 0 {
+				excessDC = -dc
+				excessStr = fmt.Sprintf(" (includes %.0fW excess DC)", -dc)
+			}
+		}
+
+		if len(site.pvMeters) > 1 {
+			site.log.DEBUG.Printf("pv %d power: %.0fW"+excessStr, i+1, power)
+		}
+
 		mm[i] = meterMeasurement{
-			Power:  power,
-			Energy: energy,
+			Power:         power,
+			Energy:        energy,
+			ExcessDCPower: excessDC,
 		}
 
 		wg.Done()
 	}
 
-	wg.Add(len(meters))
-	for i, meter := range meters {
+	wg.Add(len(site.pvMeters))
+	for i, meter := range site.pvMeters {
 		go fun(i, meter)
 	}
 	wg.Wait()
 
-	return mm
+	site.pvPower = lo.Reduce(mm, func(acc float64, m meterMeasurement, _ int) float64 {
+		return acc + max(0, m.Power)
+	}, 0)
+	site.excessDCPower = lo.Reduce(mm, func(acc float64, m meterMeasurement, _ int) float64 {
+		return acc - math.Abs(m.ExcessDCPower)
+	}, 0)
+	totalEnergy := lo.Reduce(mm, func(acc float64, m meterMeasurement, _ int) float64 {
+		return acc + m.Energy
+	}, 0)
+
+	var excessStr string
+	if site.excessDCPower < 0 {
+		excessStr = fmt.Sprintf(" (includes %.0fW excess DC)", -site.excessDCPower)
+	}
+
+	site.log.DEBUG.Printf("pv power: %.0fW"+excessStr, site.pvPower)
+	site.publish(keys.PvPower, site.pvPower)
+	site.publish(keys.PvEnergy, totalEnergy)
+	site.publish(keys.Pv, mm)
 }
 
-// updatePvMeters updates pv meters. All measurements are optional.
-func (site *Site) updatePvMeters() {
-	if len(site.pvMeters) == 0 {
+// updateAuxMeters updates aux meters
+func (site *Site) updateAuxMeters() {
+	if len(site.auxMeters) == 0 {
 		return
 	}
 
-	mm := site.collectMeters("pv", site.pvMeters)
+	var wg sync.WaitGroup
 
-	for i, meter := range site.pvMeters {
-		power := mm[i].Power
+	mm := make([]meterMeasurement, len(site.auxMeters))
 
-		if power < -500 {
-			site.log.WARN.Printf("pv %d power: %.0fW is negative - check configuration if sign is correct", i+1, power)
+	fun := func(i int, meter api.Meter) {
+		if power, err := meter.CurrentPower(); err == nil {
+			mm[i].Power = power
+			site.log.DEBUG.Printf("aux power %d: %.0fW", i+1, power)
+		} else {
+			site.log.ERROR.Printf("aux meter %d: %v", i+1, err)
 		}
 
-		if m, ok := meter.(api.MaxACPower); ok {
-			if dc := m.MaxACPower() - power; dc < 0 && power > 0 {
-				mm[i].ExcessDCPower = -dc
-				site.log.DEBUG.Printf("pv %d excess DC: %.0fW", i+1, -dc)
-			}
-		}
+		wg.Done()
 	}
 
-	site.pvPower = lo.Reduce(mm, func(acc float64, m meterMeasurement, _ int) float64 {
-		return acc + max(0, m.Power)
-	}, 0)
-	site.excessDCPower = lo.Reduce(mm, func(acc float64, m meterMeasurement, _ int) float64 {
-		return acc - math.Abs(m.ExcessDCPower)
-	}, 0)
-	totalEnergy := lo.Reduce(mm, func(acc float64, m meterMeasurement, _ int) float64 {
-		return acc + m.Energy
+	wg.Add(len(site.auxMeters))
+	for i, meter := range site.auxMeters {
+		go fun(i, meter)
+	}
+	wg.Wait()
+
+	site.auxPower = lo.Reduce(mm, func(acc float64, m meterMeasurement, _ int) float64 {
+		return acc + m.Power
 	}, 0)
 
-	if len(site.pvMeters) > 1 {
-		var excessStr string
-		if site.excessDCPower < 0 {
-			excessStr = fmt.Sprintf(" (includes %.0fW excess DC)", -site.excessDCPower)
+	site.log.DEBUG.Printf("aux power: %.0fW", site.auxPower)
+	site.publish(keys.AuxPower, site.auxPower)
+	site.publish(keys.Aux, mm)
+}
+
+// updateExtMeters updates ext meters
+func (site *Site) updateExtMeters() {
+	if len(site.extMeters) == 0 {
+		return
+	}
+
+	mm := make([]meterMeasurement, len(site.extMeters))
+
+	for i, meter := range site.extMeters {
+		// ext power
+		power, err := backoff.RetryWithData(meter.CurrentPower, bo())
+		if err != nil {
+			site.log.ERROR.Printf("ext meter %d power: %v", i+1, err)
 		}
 
-		site.log.DEBUG.Printf("pv power: %.0fW"+excessStr, site.pvPower)
+		// ext energy
+		var energy float64
+		if m, ok := meter.(api.MeterEnergy); err == nil && ok {
+			energy, err = m.TotalEnergy()
+			if err != nil {
+				site.log.ERROR.Printf("ext meter %d energy: %v", i+1, err)
+			}
+		}
+
+		mm[i] = meterMeasurement{
+			Power:  power,
+			Energy: energy,
+		}
 	}
 
-	site.publish(keys.PvPower, site.pvPower)
-	site.publish(keys.PvEnergy, totalEnergy)
-	site.publish(keys.Pv, mm)
+	// Publishing will be done in separate PR
 }
 
 // updateBatteryMeters updates battery meters
-func (site *Site) updateBatteryMeters() {
+func (site *Site) updateBatteryMeters() error {
 	if len(site.batteryMeters) == 0 {
-		return
+		return nil
 	}
 
-	mm := site.collectMeters("battery", site.batteryMeters)
-	bm := make([]batteryMeasurement, len(site.batteryMeters))
+	var eg errgroup.Group
+
+	mm := make([]batteryMeasurement, len(site.batteryMeters))
+
+	fun := func(i int, meter api.Meter) error {
+		power, err := backoff.RetryWithData(meter.CurrentPower, bo())
+		if err != nil {
+			// power is required- return on error
+			return fmt.Errorf("battery %d power: %v", i+1, err)
+		}
+
+		if len(site.batteryMeters) > 1 {
+			site.log.DEBUG.Printf("battery %d power: %.0fW", i+1, power)
+		}
+
+		// battery energy (discharge)
+		var energy float64
+		if m, ok := meter.(api.MeterEnergy); ok {
+			energy, err = m.TotalEnergy()
+			if err != nil {
+				site.log.ERROR.Printf("battery %d energy: %v", i+1, err)
+			}
+		}
 
-	for i, meter := range site.batteryMeters {
 		// battery soc and capacity
 		var batSoc, capacity float64
-		var err error
+		if meter, ok := meter.(api.Battery); ok {
+			batSoc, err = soc.Guard(meter.Soc())
 
-		if m, ok := meter.(api.Battery); ok {
-			batSoc, err = soc.Guard(m.Soc())
 			if err == nil {
-				if m, ok := m.(api.BatteryCapacity); ok {
+				if m, ok := meter.(api.BatteryCapacity); ok {
 					capacity = m.Capacity()
 				}
 
-				site.log.DEBUG.Printf("battery %d soc: %.0f%%", i+1, batSoc)
+				if len(site.batteryMeters) > 1 {
+					site.log.DEBUG.Printf("battery %d soc: %.0f%%", i+1, batSoc)
+				}
 			} else {
 				site.log.ERROR.Printf("battery %d soc: %v", i+1, err)
 			}
@@ -549,16 +632,26 @@ func (site *Site) updateBatteryMeters() {
 
 		_, controllable := meter.(api.BatteryController)
 
-		bm[i] = batteryMeasurement{
-			Power:        mm[i].Power,
-			Energy:       mm[i].Energy,
+		mm[i] = batteryMeasurement{
+			Power:        power,
+			Energy:       energy,
 			Soc:          batSoc,
 			Capacity:     capacity,
 			Controllable: controllable,
 		}
+
+		return nil
+	}
+
+	for i, meter := range site.batteryMeters {
+		eg.Go(func() error { return fun(i, meter) })
+	}
+
+	if err := eg.Wait(); err != nil {
+		return err
 	}
 
-	site.batterySoc = lo.Reduce(bm, func(acc float64, m batteryMeasurement, _ int) float64 {
+	site.batterySoc = lo.Reduce(mm, func(acc float64, m batteryMeasurement, _ int) float64 {
 		// weigh soc by capacity
 		weighedSoc := m.Soc
 		if m.Capacity > 0 {
@@ -566,7 +659,7 @@ func (site *Site) updateBatteryMeters() {
 		}
 		return acc + weighedSoc
 	}, 0)
-	totalCapacity := lo.Reduce(bm, func(acc float64, m batteryMeasurement, _ int) float64 {
+	totalCapacity := lo.Reduce(mm, func(acc float64, m batteryMeasurement, _ int) float64 {
 		return acc + m.Capacity
 	}, 0)
 
@@ -576,50 +669,23 @@ func (site *Site) updateBatteryMeters() {
 	}
 	site.batterySoc /= totalCapacity
 
-	site.batteryPower = lo.Reduce(bm, func(acc float64, m batteryMeasurement, _ int) float64 {
+	site.log.DEBUG.Printf("battery soc: %.0f%%", math.Round(site.batterySoc))
+	site.publish(keys.BatteryCapacity, totalCapacity)
+	site.publish(keys.BatterySoc, site.batterySoc)
+
+	site.batteryPower = lo.Reduce(mm, func(acc float64, m batteryMeasurement, _ int) float64 {
 		return acc + m.Power
 	}, 0)
-	totalEnergy := lo.Reduce(bm, func(acc float64, m batteryMeasurement, _ int) float64 {
+	totalEnergy := lo.Reduce(mm, func(acc float64, m batteryMeasurement, _ int) float64 {
 		return acc + m.Energy
 	}, 0)
 
-	if len(site.batteryMeters) > 1 {
-		site.log.DEBUG.Printf("battery power: %.0fW", site.batteryPower)
-		site.log.DEBUG.Printf("battery soc: %.0f%%", math.Round(site.batterySoc))
-	}
-
-	site.publish(keys.BatteryCapacity, totalCapacity)
-	site.publish(keys.BatterySoc, site.batterySoc)
-
+	site.log.DEBUG.Printf("battery power: %.0fW", site.batteryPower)
 	site.publish(keys.BatteryPower, site.batteryPower)
 	site.publish(keys.BatteryEnergy, totalEnergy)
 	site.publish(keys.Battery, mm)
-}
 
-// updateAuxMeters updates aux meters
-func (site *Site) updateAuxMeters() {
-	if len(site.auxMeters) == 0 {
-		return
-	}
-
-	mm := site.collectMeters("aux", site.auxMeters)
-	site.auxPower = lo.Reduce(mm, func(acc float64, m meterMeasurement, _ int) float64 {
-		return acc + m.Power
-	}, 0)
-
-	site.log.DEBUG.Printf("aux power: %.0fW", site.auxPower)
-	site.publish(keys.AuxPower, site.auxPower)
-	site.publish(keys.Aux, mm)
-}
-
-// updateExtMeters updates ext meters
-func (site *Site) updateExtMeters() {
-	if len(site.extMeters) == 0 {
-		return
-	}
-
-	mm := site.collectMeters("ext", site.extMeters)
-	site.publish(keys.Ext, mm)
+	return nil
 }
 
 // updateGridMeter updates grid meter
@@ -676,10 +742,10 @@ func (site *Site) updateMeters() error {
 	var eg errgroup.Group
 
 	eg.Go(func() error { site.updatePvMeters(); return nil })
-	eg.Go(func() error { site.updateBatteryMeters(); return nil })
 	eg.Go(func() error { site.updateAuxMeters(); return nil })
 	eg.Go(func() error { site.updateExtMeters(); return nil })
 
+	eg.Go(site.updateBatteryMeters)
 	eg.Go(site.updateGridMeter)
 
 	return eg.Wait()