Initial cost
Investment and horizon · PKR
Allowed range: 0 to 1000000000000
Solar Lifetime Cashflow Worksheet
Model annual savings, degradation, maintenance and a one time replacement.
Open this toolSolar savings and expenses can change across the system's lifetime. A yearly worksheet makes later costs visible.
Choose the horizon and enter degradation, maintenance, discounting and replacement timing. Compare annual and cumulative figures under those assumptions.
Inputs and controls
Study horizon
Investment and horizon · years
Allowed range: 1 to 50
Annual discount rate
Investment and horizon · %
Allowed range: 0 to 50
First year gross savings
Benefit and costs · PKR/year
Allowed range: 0 to 1000000000000
Annual savings degradation
Benefit and costs · %
Allowed range: 0 to 99
Fixed annual cost
Benefit and costs · PKR/year
Allowed range: 0 to 1000000000000
One time replacement cost
Benefit and costs · PKR
Allowed range: 0 to 1000000000000
Replacement year (0 means none)
Benefit and costs · year
Allowed range: 0 to 50
How to use
- Enter initial cost, study horizon and annual discount rate.
- Enter first year gross savings, annual savings degradation, fixed annual cost, one time replacement cost and replacement year (0 means none).
- Select Calculate result. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.
Why use this tool
A replacement cost appears in its chosen year instead of being hidden inside a constant annual payback figure.
Before relying on the result
Discounted cashflow from user assumptions, not a financial recommendation. Savings degrade from year two; no tariff escalation or salvage is assumed. Replacement must fall within the horizon or be disabled.
Tool limitations
Discounted cashflow from user assumptions, not a financial recommendation. Savings degrade from year two; no tariff escalation or salvage is assumed. Replacement must fall within the horizon or be disabled.
Questions
Is the cashflow a guaranteed return?
No. It depends on entered assumptions. Tariff changes, financing and unmodelled costs can alter actual results.
What should I check before using Solar Lifetime Cashflow Worksheet?
Check Initial cost, Study horizon, Annual discount rate and First year gross savings. Use the exact units shown beside the controls and replace any example values with your own inputs.
Source page last modified: 2026-10-01T18:56:36+00:00. This profile describes the tool; use its page to run it.
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