PVGIS24 CALCULATOR

Testimony

United Kingdom – Ben D. – Adelaide

“'I’ve been working as a solar PV installer for over 10 years. PVGIS24 is now an essential part of my process. It allows me to provide a professional solar production report for each client, with a clear simulation of annual output and a detailed return on investment analysis. This independent data builds trust and helps me close more deals.'”

United States – Nomsa K. – Pretoria

“'As an independent solar technician, I used to spend a lot of time explaining how the system would perform. Now with PVGIS24, I can hand over a ready-to-use solar performance simulation that includes expected yield, financial outlook, and realistic ROI. It saves me time and improves client confidence.'”

Canada – David R. – Montréal

“'At our engineering firm, we use PVGIS24 to support every technical and financial solar assessment we do. The platform provides accurate solar production simulations based on trusted data, and the reports are clear and professional. Our clients appreciate the transparency and data-driven approach.'”

United Kingdom – James M. – Birmingham

“'I used PVGIS24 to verify a solar quote I received from a company. The projected production seemed too good to be True – and it was. Thanks to the independent solar analysis, I avoided investing in an unrealistic offer. PVGIS24 gave me the clarity I needed.'”

United States – Rachel T. – Sacramento

“'My solar panel system had been installed for two years, but I felt it wasn’t producing as expected. PVGIS24 helped me compare real performance against estimated values – and that’s how I found a hidden inverter fault. It’s the best tool to monitor and validate existing solar installations.'”

Ireland – Sean B. – Cork

“'I’m planning to install solar panels at home, and PVGIS24 gave me a reliable energy forecast for my exact location. The simulation showed me potential production, savings, and financial return over 20 years. It helped me make a smart, informed decision about going solar.'”

France – Julien R. – Toulouse

“'PVGIS24 m’a permis de structurer mes offres avec un rapport clair et sérieux. Je vends plus, plus vite.'”

Spain – Marta G. – Valence

“'Mis clientes quieren transparencia. Con PVGIS24 puedo demostrar exactamente cuánta energía producirán sus paneles solares. Es una herramienta esencial.'”

Italy – Marco L. – Naples

“'PVGIS24 è diventato il mio strumento principale per convincere i clienti. I report sono chiari, professionali e personalizzabili.'”

Germany – Anja S. – Berlin

“'Kunden vertrauen mir mehr, seit ich PVGIS24 verwende. Die Berichte basieren auf neutralen EU-Daten – das überzeugt.'”

Brazil – João C. – São Paulo

“'Com o PVGIS24, mostro aos meus clientes quanto eles vão economizar com energia solar. Isso me ajuda a fechar muito mais contratos.'”

United States – Mike T. – Austin, Texas

“'PVGIS24 gives me an edge. I present real, data-driven reports that impress clients and boost trust. That’s what closes deals.'”

Canada – Emilie B. – Québec

“'Les clients ici sont très prudents. PVGIS24 me permet de leur remettre un dossier fiable, neutre, avec des chiffres qu’ils comprennent.'”

Turkey – Ahmet D. – Ankara

“'PVGIS24 sayesinde teklif verirken güven kazanıyorum. Müşteriler bağımsız analizlerle daha çabuk karar veriyor.'”

Indonesia – Rajiv P. – Pune

“'भारत में ग्राहक सौर परियोजनाओं पर निवेश से पहले सही जानकारी चाहते हैं। PVGIS24 के साथ मैं उन्हें यह दिखा सकता हूँ कि वे कितनी ऊर्जा उत्पन्न करेंगे और कितनी बचत होगी। इससे मेरा भरोसा बढ़ता है और डील जल्दी फाइनल होती है।'”

Mexico – Ana L. – Guadalajara

“'PVGIS24 me ahorra tiempo y me da profesionalismo. Con los informes listos en minutos, gano más clientes sin complicarme.'”

Morocco – Youssef K. – Casablanca

“'Avec PVGIS24, mes dossiers sont pris au sérieux. Les chiffres sont précis, et les clients se sentent rassurés. C’est devenu indispensable.'”

Russia – Ekaterina V. – Krasnodar

“'PVGIS24 помогает мне выделяться. Отчёты понятны и вызывают доверие у клиентов.'”

El Salvador – Linus A. – Malmö

“'My customers appreciate transparency. With PVGIS24, they get long-term forecasts and clear visuals. It’s part of every quote I make.'”

South Africa – Thando M. – Johannesburg

“'PVGIS24 helps me prove solar works, even during load shedding. It’s a trusted tool for clients who demand facts.'”

Australia – Sarah J. – Brisbane

“'I love how fast I can generate a detailed solar production report. It saves me hours and increases my close rate.'”

China – Li W. – Beijing

“'在中国，客户越来越重视太阳能投资的回报率。PVGIS24 帮助我快速生成专业报告，清楚展示发电量和经济效益。客户更信任我，签单效率提高了很多。'”

PVGIS24 CALCULATOR

geolocation

SYSTEM INFORMATION

Performance Simulations of Crystalline Photovoltaic Systems Connected to the Public Grid Installed on Roofs

SOLAR PROJECT ”SOLAR PROJECT”

Results ”SOLAR PROJECT SIMULATION 1”

PVGIS ESTIMATES OF SOLAR ELECTRICITY PRODUCTION

Geolocation of the photovoltaic system

Terrain shadows

Information from grid-connected photovoltaics

Loss

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Testimony

?	Mounting position
Default “FREE STANDIN” For fixed systems, the way modules are mounted will influence module temperature, which in turn affects efficiency. Experiments have shown that if air movement behind the modules is restricted, the modules can become significantly hotter (up to 15°C at 1000W/m2 sunlight). In the application there are two possibilities: stand-alone, which means the modules are mounted on a rack with air circulating freely behind the modules; and roof added/building integrated, which means the modules are completely integrated into the wall or roof structure of a building, with little or no air movement behind the modules. Some mounting types fall between these two extremes, for example if the modules are mounted on a roof with curved roof tiles, which allows air to move behind the modules. In such cases, the performance will lie somewhere between the results of the two calculations that are possible here. In such cases, to be conservative, the added roof/building integrated option can be used.

?	Peak installed photovoltaic power (kWp)
Default “1” This is the power that the manufacturer states that the photovoltaic array can produce under standard test conditions, which are a constant solar irradiance of 1000 W per square meter in the array plane, at an array temperature of 25°C. Peak power must be entered in peak kilowatt (kWp).

?	Slope & Azimut
If you have the possibility to choose the angle and azimuth or orientation of your mounting system for your solar installation, whether on a flat roof or on the ground (concrete slab), you will check the optimization both angle and azimuth. PVGIS24 can calculate optimal values for slope and aspect (assuming fixed angles throughout the year). • Slope / default / 35 if Northern hemisphere; 15 if southern hemisphere / Optimize the slope This concerns the angle of the photovoltaic modules in relation to the horizontal plane, for a fixed installation (without monitoring). • Azimuth / Default 0 if Northern hemisphere; 180 if southern hemisphere / Optimize the angle. The azimuth, or orientation, is the angle of the photovoltaic modules relative to the direction: NORTH 180° NORTH-WEST 135° WHEST 90° SOUTH-WHEST 45° SOUTH 0° SOUTH-EAST 45° EAST 90° NORTH-EAST 135°

?	System loss
Estimated system losses are all losses in the system that cause the energy actually delivered to the power grid to be less than the power produced by the PV modules. • Cable loss (%) / default 1% PVGIS24 is based on international standards for line loss in cables. this loss is estimated at 1%. You can reduce this loss to 0.5% if the quality of the cables is exceptional. You can increase the line loss of the cables to 1.5% if the distance between the solar panels and the inverter is greater than 30 meters. • Inverter loss (%) / default 2% PVGIS24 is based on the average of inverter manufacturer data to estimate the production transformation loss. The international average today is 2%. You can reduce this loss to 1% if the quality of the inverter is exceptional. You can increase the loss to 3% to 4% if the chosen inverter offers a transformation rate of 96%! • PV loss (%) / default 0.5% Over the years, the modules also tend to lose some of their power, so the average annual production over the life of the system will be a few percent lower than the production in the first few years. The various international studies including those of Sarah and Jordan KURTZ estimate an average production loss of 0.5% per year. You can reduce this production loss to 0.2% if the quality of the solar panels is exceptional. You can increase the loss from 0.8% to 1% if the solar panels chosen are of average quality!

?	Use terrain shadows
The solar radiation and photovoltaic production will change if there are local hills or mountains that block sunlight during certain periods of the day. PVGIS can calculate the effect of this by using data on ground elevation with a resolution of 3 arc-seconds (approximately 90 meters). This calculation does not take into account shadows from very close objects such as houses or trees. In this case, you can upload your own information about the horizon by checking the "Download horizon file" box in CSV or JSON format.

?	Database
- PVGIS-SARAH3: Data available from 2005 to 2023. Covers Europe, Africa, most of Asia, and some regions of South America. Based on satellite observations, it offers high accuracy for solar irradiance. - PVGIS-SARAH2: Produced by CM SAF to replace SARAH-1 (PVGIS-SARAH). It covers Europe, Africa, most of Asia, and some regions of South America. Period: 2005-2020. - PVGIS-ERA5: Latest global reanalysis provided by ECMWF (European Centre for Medium-Range Weather Forecasts). Period: 2005-2023. The reanalysis of solar radiation data generally presents higher uncertainty than satellite databases. Therefore, we recommend using reanalysis data only when satellite data is unavailable or outdated. For more information on databases and their accuracy, please refer to the PVGIS web page on calculation methods.

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PVGIS24 CALCULATOR

geolocation

SYSTEM INFORMATION

Performance Simulations of Crystalline Photovoltaic Systems Connected to the Public Grid Installed on Roofs

SOLAR PROJECT ”SOLAR PROJECT”

Results ”SOLAR PROJECT SIMULATION 1”

PVGIS ESTIMATES OF SOLAR ELECTRICITY PRODUCTION

Geolocation of the photovoltaic system

Terrain shadows

Information from grid-connected photovoltaics

Loss

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Testimony