Quick Answer: Watt-peak to Kilowatt-peak
One watt-peak equals 0.001 kilowatt-peak (1 Wp = 0.001 kWp).
Conversely, 1 kWp = 1,000 Wp.
Formula: kWp = Wp ÷ 1,000
Worked examples
- 300 Wp = 0.3 kWp
- 350 Wp = 0.35 kWp
- 400 Wp = 0.4 kWp
Method and limitations
Watt-peak is the DC output of a single module (or a whole array) at Standard Test Conditions. Divide by 1,000 to express the same rating in kilowatt-peak. Calculations use full-precision constants; answers in this box are rounded for readability (≈ marks a rounded value) and the calculator shows up to 9 significant figures.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
Watt-peak is the DC output of a single module (or a whole array) at Standard Test Conditions. Divide by 1,000 to express the same rating in kilowatt-peak.
Complete Guide to Watt-peak to Kilowatt-peak Conversion
What is a watt-peak?
Watt-peak (Wp) is the DC power a solar module delivers at Standard Test Conditions. Individual panel datasheets are always given in Wp.
What is a kilowatt-peak?
Kilowatt-peak (kWp) is the array-level rating used in quotes, subsidy applications and grid connection paperwork.
How the Conversion Works
Sum the Wp rating of every module in the array, then divide by 1,000. The result is the array size in kWp, which is the number installers, utilities and incentive schemes work with.
Why This Conversion Matters
Panel datasheets speak Wp, while pricing (€/kWp), grid limits and subsidies speak kWp. Converting correctly is what makes two quotes with different panel wattages comparable.
Step-by-Step Conversion Guide
Follow these steps to convert watt-peak to kilowatt-peak manually:
Start with your value in watt-peak
Example: You want to convert 400 Wp
Apply the conversion formula
Use the formula: kWp = Wp ÷ 1,000
Calculate the result
400 Wp = 0.4 kWp
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
Watt-peak is the DC output of a single module (or a whole array) at Standard Test Conditions. Divide by 1,000 to express the same rating in kilowatt-peak.
Common Conversions
| Watt-peak (Wp) | Kilowatt-peak (kWp) | Kilowatt-peak → Watt-peak |
|---|---|---|
| 300 Wp | 0.3 | 300 kWp = 300,000 Wp |
| 350 Wp | 0.35 | 350 kWp = 350,000 Wp |
| 400 Wp | 0.4 | 400 kWp = 400,000 Wp |
| 435 Wp | 0.435 | 435 kWp = 435,000 Wp |
| 450 Wp | 0.45 | 450 kWp = 450,000 Wp |
| 500 Wp | 0.5 | 500 kWp = 500,000 Wp |
| 1000 Wp | 1 | 1000 kWp = 1,000,000 Wp |
| 3000 Wp | 3 | 3000 kWp = 3,000,000 Wp |
| 5000 Wp | 5 | 5000 kWp = 5,000,000 Wp |
| 6000 Wp | 6 | 6000 kWp = 6,000,000 Wp |
| 10000 Wp | 10 | 10000 kWp = 10,000,000 Wp |
Frequently Asked Questions
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Conversion factors on this page are either exact by definition, derived from exact definitions, or conventional values in documented use. Each is listed with its source in our conversion methodology and sources, which cites the BIPM SI Brochure, NIST Special Publication 811 and the relevant IEC or national standards. Results are rounded for display only; calculations use full precision.