Home Battery Profit Simulator
Curious how much money a home battery can save you? Calculate the expected profit before you invest!
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Instant results
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Results
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Financial results
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Annual savings on energy bill
€ —
Payback period
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Total profit over the lifetime
€ —
Advanced financial analysis (NPV, IRR, ROI)
Profit in today's euros
Net present value (NPV)
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Annual return
Internal rate of return (IRR)
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Total return
Return on investment (ROI)
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Impact on annual consumption
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Grid consumption
Grid injection
Extra self-consumption
Impact on annual energy costs
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Net energy cost
Energy cost breakdown
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Consumption cost (energy + capacity)
Injection revenue
Net energy cost
Average daily profile over one year
Without battery
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Grid consumption
Grid injection
With battery
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Grid consumption
Battery discharge for self-use
Battery charge from grid
Battery charge from solar
Battery discharge to grid
Grid injection
Feedback & Suggestions
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What's new
- September 2026 New logo and a fresher look. The choices in the form now also work with the keyboard.
- September 2026 New: a page for businesses that want a tailored battery study, and a page for installers who want to work together.
- September 2026 You can now download your result as a PDF, including your assumptions and charts — useful to take to your installer.
- September 2026 The calculation now includes battery ageing: savings drop slightly each year as the battery loses capacity.
- September 2026 Fix for uploaded CSV files shorter than a year: the battery's savings are now also converted to a full year, and the battery works with your real quarter-hour values. The yearly savings used to come out too low.
- September 2026 You now choose whether we may use analytics cookies (Google Analytics). The calculator works the same either way. Change your choice at any time via 'Cookie settings' at the bottom of every page.