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# About measured irradiation results

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Hello,

I've got daily solar radiation measurements (W/m2) from local meteo station.

After comparing kWh/m²a data between PVSOL provided data and meassured values, i get 10-14% more radiation.

Does PVSOL uses old data or im doing something wrong by entering data? I calculate average month W/m2 value before entering to PVSOL or is it possible to enter daily data?

PVSOL presentation with measured values gives me 1261,8 kWh/kWp what is unreal in my country.

According to https://meteonorm.com/en/demo-files-maps Europe - Yearly sum of global horizontal irradiation (1996–2015) i should get about 1000-1050 kWh/m2.

Please help!

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• 3 weeks later...

Hello Aidas,

thanks for your contribution and sorry for my late reply.

On 6/26/2024 at 4:32 PM, Aidas said:

Does PVSOL uses old data or im doing something wrong by entering data? I calculate average month W/m2 value before entering to PVSOL or is it possible to enter daily data?

PVSOL uses the latest available long-term data from various climate data providers for the respective location. Your input appears correct but refers to a short period of time, compared to the Meteonorm data. Daily data cannot be entered. Only the average daily radiation of the month (in Wh/m²) or the sum the radiation of all days of a month (in kWh/m²).

The global radiation and the annual yield cannot be compared directly. Since the question relates to the appropriateness of the global radiation, I will only refer to the global radiation values.

I created a new location for Vinkšnėnų with Meteonorm and got 1025 w/m2 for annual sum of global radiation. The deviation from the measurement data you entered is then plausible at approx. 70 W/m² (approx. 10 percent), since the Metonorm data contains almost 20 years and the period you entered is much shorter. For this reason, I would recommend creating a self-generated location based on Meteonorm for the simulation. You can find a description of how to do this in our online help:

I hope this helps.

Kind regards

Mikio

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