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
Tool version
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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
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What's new
- October 2026 In the advanced version you can now set your battery's round-trip efficiency yourself: how much of the energy you charge you get back out.
- 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.