# Solar Output Degradation Planner

Track an entered first year yield under a constant annual reduction.

[Open this tool](https://whatson.pk/degradation-calculator/)

Category: Solar & Battery

An annual reduction compounds from the output already reduced in the previous year.

Enter first year energy and a constant degradation rate, then inspect the year by year production. Keep the initial year unchanged on this basis.

## Inputs and controls

* First year output (kWh). Allowed range: 0 to 1000000000
* Annual output reduction (%). Allowed range: 0 to 99
* Study years (years). Allowed range: 1 to 50

## How to use

* Enter first year output, annual output reduction and study years.

* Select Calculate result. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

The production series shows the difference between compounding a reduction and subtracting the same energy amount every year.


## Before relying on the result

First year output is used unchanged. The reduction compounds from year two. This is not a warranty interpretation or predicted module life; temperature and site performance remain outside the model.


## Tool limitations

First year output is used unchanged. The reduction compounds from year two. This is not a warranty interpretation or predicted module life; temperature and site performance remain outside the model.

## Questions

### Is this a panel warranty interpretation?

No. It is an entered reduction model. Warranty terms and observed site performance need separate review.

### What should I check before using Solar Output Degradation Planner?

Check First year output, Annual output reduction and Study years. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-01T18:56:36+00:00

This profile describes the tool. It does not execute it or supply a professional certification.