Solar PV calculator

Type kWp, yield, degradation, years, self-consumption and the grid. 5 and 1050 give 5.25 MWh in year 1. 8 and 1100 give 8.80 MWh. 3 and 900 give 2.70 MWh. Year-1 energy, not a loan payment.

Year 1. 5 kWp and 1050 kWh/kWp give 5.25 MWh. Not payback.

Input data

Results

Enter data and click Calculate.

How it works

Solar PV calculator in this calculator shows year-1 MWh on the first line. 5 kWp and 1050 kWh/kWp give 5.25 MWh. 8 kWp and 1100 give 8.80 MWh. 3 kWp and 900 give 2.70 MWh. The dot in 5.25 is two fixed places, not a comma.

The second line is cumulative CO₂ from years, degradation, self-consumption and g CO₂/kWh. At 5, 1050, 0.5, 25, 30 and 350 the second line is 30,298.8 kg CO₂. The examples take the first line: 5.25 MWh, not that mass.

5.25 MWh is not a loan payment. 8.80 MWh does not know the kWh price. 2.70 MWh is 3 × 900 / 1000. The calculator does not compute net billing or a battery.

Appliance electricity next door sums device kWh. Household CO₂ reads the meter. Here yield stays: 5 × 1050 / 1000 stays 5.25 MWh.

Type 5, 1050, 0.5, 25, 30 and 350, then Calculate. A comma in 0.5 parses. An energy sketch, not an installer quote.

5 and 1050 give 5.25 MWh. 8 and 1100 give 8.80 MWh. 3 and 900 give 2.70 MWh. Another yield at 5 changes 5.25.

Formula

Year-1 MWh = kWp × yield / 1000. Cumulative CO₂ = sum of years: kWp × yield × (1 − degradation/100)^(year−1) × (1 − self-use/100) × (grid/1000). Examples take year-1 MWh.

How to use

  1. Type 5 kWp and yield 1050 kWh/kWp.
  2. Add degradation 0.5, years 25, self-use 30 and grid 350.
  3. Click Calculate. The first line is 5.25 MWh.
  4. 8 and 1100 give 8.80 MWh. 3 and 900 give 2.70 MWh.
  5. Year-1 energy, not payback and not net billing.

5 × 1050 / 1000 = 5.25 MWh

Year 1. 5 kWp and 1050 kWh/kWp give 5.25 MWh. Not payback.

Solar
Yield in year 1, not a loan. 3 and 900 leave 2.70 MWh. CO₂ sits on the second line.
PV
Six fields. 5 and 1050 leave 5.25 MWh. 8 and 1100 leave 8.80 MWh.
calculator
The first-line unit is MWh. 5.25 MWh is 5 × 1050 / 1000. The dot stays.

Examples

Example 1

  • 5 kWp
  • yield 1050
  • degradation 0.5%
  • 25 years
  • self-use 30%
  • grid 350

5.25 MWh

How many MWh in year 1 from 5 kWp and 1050? 5.25 MWh. Energy, not payback.

Example 2

  • 8 kWp
  • yield 1100
  • degradation 0.4%
  • 20 years
  • self-use 40%
  • grid 400

8.80 MWh

How many from 8 kWp and 1100? 8.80 MWh.

Example 3

  • 3 kWp
  • yield 900
  • degradation 0.6%
  • 15 years
  • self-use 25%
  • grid 300

2.70 MWh

How many from 3 kWp and 900? 2.70 MWh.

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Common questions

How many MWh in year 1 from 5 kWp and 1050?

5.25 MWh. 5 × 1050 / 1000. Energy, not payback.

How many at 8 kWp and 1100?

8.80 MWh. 8 × 1100 / 1000.

How many at 3 kWp and 900?

2.70 MWh. 3 × 900 / 1000.

Is 5.25 MWh a return on investment?

No. The first line is year-1 energy. Net billing and a loan sit outside this calculator.

Where is avoided CO₂?

On the second line. At 5, 1050, 25 and 350 that is 30,298.8 kg CO₂. Examples take 5.25 MWh.

Why a dot in 5.25?

Two places on MWh. Year 1 on this calculator uses a dot, not a comma.

Does self-use change 5.25 MWh?

No. 5.25 is kWp × yield / 1000. Self-use enters cumulative CO₂.

Does a comma in 0.5 work?

Yes. Degradation 0,5 and 0.5 are the same.

Is this an installer quote?

No. A yield sketch. A battery and the kWh price do not enter.

Knowledge sources

The factors on the page are a sketch. Below are EPA emissions terms, not a national inventory.

Page updated in 2026.