Solar panel and battery calculator
Compare solar self-consumption with and without a battery using editable annual yield, tariffs and investment.
Calculation inputs
Editable example. Replace prices and assumptions with your project data; these are not verified rates or a quote.
Project
ProjectYou can calculate. The cloud project is unavailable; this form draft can only be recovered on this device.
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Indicative result
- Annual generation
- 5,600 kWh / year
- Self-consumption
- 2,240 kWh / year
- Exported surplus
- 3,360 kWh / year
- Simple payback
- 10.7 years
- Total saving with battery
- €798.80 / year
- System payback with battery
- 12.52 years
- Payback of battery addition
- 16.81 years
Exports use your entered effective value. Monthly caps, tariff conditions and hourly battery operation are not modeled.
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How it is calculated
Annual generation = PV capacity (kWp) × Net specific yield (kWh/kWp/year)
Self-consumption = min ( Annual generation × Generation self-used without battery (%) /100, Annual electricity use (kWh) )
Exported surplus = Annual generation − Self-consumption
Indicative result = Self-consumption × Purchased electricity (€/kWh) + Exported surplus × Effective export value (€/kWh) − Additional annual maintenance (€)
Simple payback = Installed investment (€) / Indicative result
What to check
Exports use your entered effective value. Monthly caps, tariff conditions and hourly battery operation are not modeled.
Simplified annual model: no grants, financing, tariff changes or degradation. Does not replace a building energy assessment.
Sources and references
European Commission · PVGISReviewed:
Frequently asked questions
Is this a final quote?
No. Results depend on your inputs and the stated scope. A professional must check the property, measurements and conditions before quoting.
Can I use measurements from my plan?
Renovation, radiator, cooling and materials calculators can use internal plan measurements. Enter built area and the thermal envelope separately. You can save scenarios in your project.
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