Solar Energy Calculator Helps to Plan Optimal Size and Profitability

Geometrisk fasad

For calculation of solar PV plants, several national tools for calculating the production potential is available, but to plan for an optimal size of a PV plant more than that is needed. A tool is needed to compare the production with the energy use of the building, to choose the optimal size. Also a better tool for financial calculation is needed. Existing tool for that has most often very rough calculations without the possibility of changing different parameters.

EFFECT4buildings has developed a tool with input from all partners and translated into English. The excel-tool for solar energy calculations can be downloaded from the Prosumerism page. It is the Calculation Tool no 4b.

The result is an excel-tool to calculate optimal size of solar PV plant and the economical profitability in 3 steps:

Step 1: Find out the optimal size of the PV plant
If the roof can produce more electricity than needed, step one helps to calculate the optimal size. In this step a few data inputs are needed.

Individual data for energy use can be inserted or general data can be used.

Step 2: Find out how much electricity your roof can produce
– A list of national web calculation tools to calculate the production capacity of a roof.

Step 3: Financial calculation
– In the last step the profitability can be calculated.

About EFFECT4buildings:

EFFECT4buildings is implemented with the support from the Interreg Baltic Sea Region Program 2014-2020 (European Regional Development Fund) and Norwegian national funding. The aim of the project is to improve the capacity of public building managers in the Baltic Sea Region by providing a comprehensive decision-making support toolbox with a set of financial instruments to unlock the investments and lower the risks of implementing energy efficiency measures in buildings owned by public stakeholders. For more information:

Text author: Marit Ragnarsson, EFFECT4buildings Project Manager, Länsstyrelsen Dalarnas län