Annual Saving
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Year 1, before degradation
Payback
—
Years to break even
10-Year NPV
—
Net present value at discount rate
Simple IRR
—
Internal rate of return over 15 years
24-Hour Tariff Rate Profile
Hourly electricity rates for selected tariff. Blue = charge window, coral = discharge window.
Cumulative Cash Flow
Projected cumulative savings over 15 years, accounting for 2.3% annual degradation.
Payback Reference Grid
Payback years by battery size and tariff plan. Based on pre-computed data at €400/kWh. This table does not change with slider inputs.