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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.

Available

Inputs

Enter values

Live

Energiemengen

iAus dem Wechselrichter oder Erzeugungszähler.
kWh

Aus dem Wechselrichter oder Erzeugungszähler.

iAus der Stromabrechnung.
kWh

Aus der Stromabrechnung.

iHöchstens so viel wie Erzeugung und Verbrauch.
kWh

Höchstens so viel wie Erzeugung und Verbrauch.

Preise (optional)

iOptional; nur für die Ersparnis. Dein Vertragspreis.
€/kWh

Optional; nur für die Ersparnis. Dein Vertragspreis.

iOptional; nur für den Einspeiseerlös. Aus deinem Einspeisebescheid.
€/kWh

Optional; nur für den Einspeiseerlös. Aus deinem Einspeisebescheid.

Load example

For illustration only – your own calculation is what counts.

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; Erzeugung − Eigenverbrauch)

Solar power not used yourself flows into the grid.

Grid drawmax(0; Verbrauch − Eigenverbrauch)

Remaining electricity that additionally comes from the grid.

Key figures

Self-consumption rateEigenverbrauch / Erzeugung

Share of the self-used solar power.

Self-sufficiencyEigenverbrauch / Verbrauch

Share 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%.

Notes

Common mistakes

  • 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.

Limits

Limitations

  • 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