Rechnerpilot Calculator
PV self-consumption calculator
Calculate self-consumption, feed-in, grid draw, self-consumption rate and self-sufficiency of a PV system from generation and consumption - economic benefit optionally from your electricity price and your feed-in tariff.
Explanation
How PV self-consumption calculator works
The PV self-consumption calculator splits the annual generation of your PV system into self-consumption, feed-in and grid draw, and determines the self-consumption rate and self-sufficiency. Monetary values only appear if you enter the electricity price and feed-in tariff.
Energy amounts
Feed-inmax(0; generation − self-consumption)Solar power not used yourself flows into the grid.
Grid drawmax(0; consumption − self-consumption)Remaining electricity that additionally comes from the grid.
Key figures
Self-consumption rateself-consumption / generationShare of the self-used solar power.
Self-sufficiencyself-consumption / consumptionShare of the household consumption covered by yourself.
Practice
Practical examples
For illustration only – your own calculation is what counts.
Self-consumption rate and self-sufficiency without monetary values
5,000 kWh annual generation, 4,000 kWh annual consumption, 1,500 kWh used directly, no prices entered.
Result: 3,500 kWh feed-in, 2,500 kWh grid draw, self-consumption rate 30%, self-sufficiency 37.5%.
Economic benefit with electricity price and feed-in tariff
6,000 kWh generation, 4,500 kWh consumption, 2,000 kWh self-consumption, €0.35/kWh electricity price, €0.08/kWh feed-in tariff.
Result: €700 in saved electricity costs plus €320 in feed-in revenue from 4,000 kWh give a €1,020 benefit per year; self-consumption rate 33.3%, self-sufficiency 44.4%.
- Self-consumption larger than generation
Self-consumption is set higher than generation or consumption.
Self-consumption can at most be as large as the smaller of the two amounts of generation and consumption.
- Self-consumption rate and self-sufficiency confused
Both key figures are treated as equal.
The rate refers to the generation, self-sufficiency to the consumption - these are different reference values.
- Tariff estimated instead of entered
A flat-rate feed-in tariff is assumed.
Take the actual electricity price and the feed-in tariff from your contract and feed-in notice.
FAQ
Frequently asked questions
What is the self-consumption rate?
The self-consumption rate indicates what share of the generated solar power is used directly yourself. It results from self-consumption divided by generation.
What does self-sufficiency mean?
Self-sufficiency shows what share of the household consumption is covered by your own PV system. It results from self-consumption divided by total consumption.
How is the feed-in calculated?
Feed-in is the part of the generation that is not used yourself: generation minus self-consumption. It cannot become negative.
What is the grid draw?
Grid draw is the electricity you additionally draw from the grid: consumption minus self-consumption. It cannot become negative either.
Do I have to enter prices?
No. Without prices the calculator only computes energy amounts and rates. Savings and feed-in revenue are added only once you enter the electricity price and feed-in tariff.
Are feed-in rates stored?
No. No EEG feed-in rates are built in. You enter the electricity price and feed-in tariff yourself from your contract or your feed-in notice.
Does the calculator account for weather or system size?
No. It does not simulate any yield. Generation, consumption and self-consumption are your measured values or estimates.
Where do I get the values?
Generation comes from the inverter or meter, consumption from the electricity bill, and self-consumption from a bidirectional meter or the system monitoring.
- Generation, consumption and self-consumption are user inputs; no yield or weather simulation takes place.
- No EEG feed-in rates are stored; the electricity price and feed-in tariff are user inputs.
- No binding statement on economic viability; the statement and feed-in notice are decisive.
Sources
Sources and references
- Erneuerbare-Energien-Gesetz (EEG 2023)Bundesministerium der Justiz / Bundesamt für Justiz
Official basis for the feed-in and remuneration of electricity from renewable energies; the specific feed-in rates are user inputs.
View sourceRetrieved: 08/03/2026 · Verified on: 08/03/2026 · Primary source - Marktstammdatenregister – Definitionen zu PV-AnlagenBundesnetzagentur
Official register with terms and key figures relating to generation systems such as photovoltaics.
View sourceRetrieved: 08/03/2026 · Verified on: 08/03/2026
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