Solar Self-Consumption Calculator
Compare PV self-consumption, autarky, grid import, and annual value with and without battery storage.
Last updated: How it is calculated
PV Inputs
Use your current measured or estimated self-consumption rate.
Set your target scenario to compare battery impact.
Self-Consumption Results
Additional annual value with battery
$93.96
Maximum annual battery cost for positive delta: $93.96
Autarky gain
18.0 pp
Extra self-used energy
900 kWh
Reduced grid import
900 kWh
Autarky with battery
72.0%
Without vs with battery
| Metric | Without battery | With battery |
|---|---|---|
| Self-used energy | 2,700 kWh | 3,600 kWh |
| Grid import | 2,300 kWh | 1,400 kWh |
| Exported energy | 6,300 kWh | 5,400 kWh |
| Autarky rate | 54.0% | 72.0% |
| Annual total value | $1,001.88 | $1,095.84 |
This tool compares energy value with and without battery using your own rates and self-consumption assumptions. For full battery investment economics, combine it with the Solar Battery Payback Calculator.
How it is calculated
Formula
Self-use = PV production × self-consumption rate Export = PV production − self-use Grid import = household consumption − self-use Annual value = self-use × power price + export × feed-in tariff
What this calculator does not account for
- The self-consumption rate is an annual average — the real pattern depends on your daily profile.
- Shading, orientation and panel ageing are not modelled.
- Tax treatment of export and self-use is out of scope.
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.