Reading Data
Now that your stromleser.one is set up, we'll show you how to read and interpret your consumption data in the app.
Main View
When you select your device in the app, you'll see the main view with the most important information at a glance.
Current Power
The large number at the top
This is your current power consumption in watts (W).
- Positive value (e.g., 850 W): You're currently drawing electricity from the grid
- Negative value (e.g., -1200 W): You're feeding electricity into the grid (only with PV systems)
- 0 W or very small: Minimal standby consumption
- 0-100 W: Standby consumption (refrigerator, router, etc.)
- 100-500 W: Normal base load (lights, TV, laptop)
- 500-2000 W: Multiple devices or one large appliance (kettle, oven)
- 2000+ W: Multiple large appliances simultaneously
Meter Reading
The cumulative number
This is the current reading of your electricity meter in kilowatt-hours (kWh).
- Shows total consumption since installation/commissioning of meter
- Corresponds to value on display of your physical meter
- For bidirectional meters: Separate values for consumption and feed-in
Example:
Consumption: 12,345.6 kWh
Feed-in: 8,234.1 kWh (only with PV)
Daily Consumption
Consumption since midnight
Shows how much electricity you've consumed today.
- Resets daily at midnight
- Displayed in kWh
- If tariffs configured: Also costs in euros
Example:
Today: 12.5 kWh (€4.06)
Monthly Consumption
Consumption in current month
Shows cumulative consumption of current calendar month.
- Resets on 1st of month
- Helps with budget planning
- With projection for entire month
Example:
This month: 285 kWh (€92.63)
Projection: ~380 kWh (~€123)
Time Series and Charts
Tap on a chart or go to "History" to see detailed time series.
Hourly View
Last 24 hours
- Bar chart with hourly values
- Shows consumption peaks
- Ideal for recognizing daily routines
What can you recognize?
- Night: Low base load consumption (refrigerator, standby)
- Morning: Peaks from coffee, breakfast
- Daytime: Fluctuating consumption
- Evening: Highest consumption (cooking, TV, etc.)
Daily View
Last 7-30 days
- Bar chart with daily values
- Comparison of weekdays
- Recognize trends
What can you recognize?
- Weekends vs. weekdays
- Particularly consumption-intensive days
- Trends (rising/falling)
Monthly View
Last 12 months
- Bar chart with monthly values
- Seasonal fluctuations
- Annual comparisons
What can you recognize?
- Winter: Higher consumption (lighting, heating pump)
- Summer: Lower consumption
- Annual trends
More on this: Understanding Power Charts
PV-Specific Views
If you have a photovoltaic system, you'll see additional information:
Feed-in vs. Consumption
Two values instead of one
- Consumption (green): Electricity from grid
- Feed-in (blue): Electricity to grid
Self-Sufficiency Rate
How much self-generated electricity are you using?
Shows how much of your consumption is covered by your own PV production.
- 0%: No self-consumption (everything from grid)
- 50%: Half self-generated, half grid consumption
- 100%: Completely self-sufficient (only possible with battery storage)
Example:
Self-sufficiency today: 65%
Self-consumption: 8.5 kWh
Grid consumption: 4.5 kWh
Feed-in: 12.3 kWh
Feed-in Compensation
Your Revenue
If you configured feed-in compensation in Tariff Parameters:
- Revenue per day
- Revenue per month
- Projection for year
Example:
Feed-in today: 15.2 kWh
Revenue: €1.25
Revenue this month: €28.40
Understanding Costs
If you configured tariffs, the app also shows costs.
Daily Costs
What does electricity cost me today?
- Calculated from consumption and energy price
- Plus proportional basic charge (basic charge/365)
- For HT/NT: Separate calculation
Example:
Consumption: 12.5 kWh × €0.325/kWh = €4.06
Basic charge: €9.90 / 30 days = €0.33
Total today: €4.39
Monthly Costs
What does electricity cost me this month?
- Sum of all daily costs
- Plus basic charge
- Projection to end of month
Example:
Consumption: 285 kWh × €0.325/kWh = €92.63
Basic charge: €9.90
Total: €102.53
Projection: ~€137
Practical Tips
Identifying Power Guzzlers
This is how to find devices with high consumption:
-
Determine Baseline
- Look at current power
- Note the value (e.g., 250 W)
-
Turn on Device
- Turn on device to be tested
- Wait 5-10 seconds
-
Read Power
- Look at current power again
- Difference is device consumption
Example:
Before turning on: 250 W
After turning on: 2,250 W
→ Kettle consumes 2,000 W
Finding Standby Consumption
This is how to find secret power guzzlers:
-
Measure at Night
- When everyone's asleep and nothing's running
- Look at current power
-
Target value: 20-50 W is normal
- Refrigerator, router, standby devices
-
Too high? (>100 W)
- Turn off devices one by one
- Find culprit
Setting Consumption Goals
Use historical data to set goals:
-
Determine Baseline
- Look at average consumption of last months
-
Define Goal
- E.g., 10% reduction
-
Monitor
- Compare current values with goal
- Adjust your behavior
Exporting Data
You can export your consumption data:
-
In the App
- Go to settings
- Select "Export Data"
-
Choose Format
- CSV for Excel/spreadsheet
- PDF for reports
-
Choose Period
- Last month
- Last year
- Custom
-
Export
- Send by email
- Save to cloud
- Save locally
Additional Possibilities
Smart Home Integration
Use your consumption data for automations:
- Home Assistant: Integrate into your smart home
- Local API: Build your own applications
Notifications
Set up notifications:
- For unusually high consumption
- When exceeding thresholds
- Daily/weekly summaries
Frequently Asked Questions
Why does power fluctuate so much?
This is normal! Electrical devices turn on and off, causing fluctuations.
Does meter reading match my physical meter?
Yes, meter reading should be identical. Small deviations (less than 0.1 kWh) are normal.
Why is my night consumption so high?
Check standby devices, refrigerator efficiency, and secret power guzzlers.
How accurate is the data?
Data is read directly from meter and is very accurate (±1%).