Solar Self-Consumption Calculator
Compare PV self-consumption, autarky, grid import, and annual value with and without battery storage.
Model: Price/example values: How it is calculated
How it is calculated
Editorial and technical responsibility: Main-Mietservice. Calculation models checked against reference cases; estimates are not individually verified quotes. Sources, review process and corrections
Formula
Direct use = minimum of PV production × rate without battery and household demand Battery delivery = minimum of additional self-use target, remaining demand and surplus PV × round-trip efficiency Battery charge = delivery ÷ efficiency Losses = charge − delivery Export = production − direct use − battery charge Grid import = demand − direct use − battery delivery Annual value = useful self-use × power price + export × feed-in tariff
What this calculator does not account for
- Rates describe useful energy delivered to the home, excluding battery losses. 90% round-trip efficiency is an editable example; older saved calculations retain their original loss-free 100% assumption.
- An annual energy balance is not an hourly simulation. Capacity, power, demand timing, standby use and ageing further limit the rate actually achievable.
- Use the separate battery calculator for investment, maintenance and payback. Tax treatment is excluded.
About This Calculator
This solar self-consumption calculator compares your PV energy flow without and with battery storage. Using your own production, consumption, self-consumption rates, and tariffs, it estimates self-use, grid import, exported energy, autarky, and annual value.
How to Use This Calculator
- 1
Enter annual PV production and annual household electricity consumption in kWh.
- 2
Set estimated self-consumption rate without battery and your target rate with battery.
- 3
Add electricity purchase price and feed-in tariff per kWh.
- 4
Compare self-use, grid import, autarky, and annual value between both scenarios.
Why Use This Calculator
Scenario Transparency
Compare no-battery and battery scenarios side by side with consistent assumptions and identical baseline data.
Autarky Visibility
See how higher self-consumption affects your dependence on grid electricity across the year.
Investment Pre-Check
Estimate the annual value increase to define whether a battery cost is economically plausible before deeper analysis.
Frequently Asked Questions
Self-consumption is the share of PV production used directly by your household. Autarky is the share of household demand covered by PV energy.
Use inverter data, energy monitoring, or your installer’s estimate. If uncertain, compare conservative and optimistic scenarios.
Self-used kWh replace grid purchases at your retail electricity price, which is often higher than feed-in tariff for exported energy.
No. This tool compares energy value only. Use the Solar Battery Payback Calculator to evaluate full battery investment economics.
Yes. You can still use it to benchmark current self-consumption and test hypothetical scenarios for future upgrades.
Update production, consumption, and tariffs whenever your system behavior or contract pricing changes.
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Disclaimer: This calculator provides estimates for planning purposes only. Actual costs may vary based on your circumstances, location, and market conditions. Not financial advice. See our Terms of Service for full disclaimers.