Energy consumption is on a permanent rise and it is becoming increasingly concentrated in cities. Hence, cities have to work on saving energy and being more efficient by finding sources with great potential to produce their own energy and implanting the correct policies. Photovoltaics is the renewable energy technology with the higher potential in the urban context and Sweden is highly committed on its investment since it is the less developed renewable source in the country. The aim of the thesis is to compare two methodologies and determine which one is better or gives more relevant information for this kind of studies in order to evaluate how good a solar map is. For doing this, the first step is to create a solar map to have a general idea about the solar potential and to know which roofs are more suitable to install PV systems. This is made with LiDAR data using ArcGIS and SEES software. After that, another study on the quantity of solar power that could be obtained from those roofs will be performed using PVsyst, where it is possible to develop an entire PV system installation and obtain more exhaust results on energy production and shadowing. Four buildings are going to be evaluated, two public ones located in Gävle city centre (Library and Concert House) and two residential ones located in Sätra. Factors such as the optimal tilt, the best azimuth angle and the distance between panel rows are dimensioned in order to reduce shading loss and improve the performance ratio of the system in PVsyst. The final system is defined with 10° tilt, south orientation (0° azimuth), 1.5meters distance between rows and modules in strings of 9 panels connected in series for the four buildings. The simulated production from the best alternative is compared with the solar map results. Since the solar map contains information about total yearly irradiation, the energy production is obtained by means of visual exploration of the results combined with simple calculations that include GCR and system efficiency. The results show that a solar map is a reliable tool to obtain a general estimation of the solar potential in buildings but it is necessary to first identify its limitations and be able to filter the results. On the other hand, PVsyst software allows making several simulations and eases to obtain a PV system in a building or structure with detailed results of the system components. It can be concluded that since the PVsyst only allows to work with specific buildings or structures, a solar map permits big amounts of data calculations. It can be said that a solar map takes part in the process of obtaining a pre-project and the PVsyst is used in the project when a real installation is sized. Nevertheless, both methods are found to be reliable and suitable for solar potential assessment works since the results obtained match.

Investment in solar power is increasing in Sweden and especially the smaller installation below 20 kW which is typical for villa roofs. Potential prosumer can use a solar map, an interactive online tool, to investigate the solar potential of their roof based on a geographical data. A study analyzing several solar concludes that the results vary greatly depending on the tool and assumptions made by the provider. This thesis aims to determine the most effective online communication techniques for communicating the cost and benefit of solar PV to potential prosumers. The overall aim of effective communication is based on utility, framing, and trust. To achieve the aim semi-structured interviews and a technical verification of a solar map in Karlstad. The website of Karlstads Energi operates by asking theuser to mark their roof area and enter their yearly electricity consumption. The ability to effectively convey information that is useful, attractive, and trustworthy is based on the user. There is not one perfect design that will work for all users as the users have different knowledge and interests going in which varies the utility. The framing that is the most favorable is using the yearly production in kWh described as a financial investment focusing on savings from the system together with environmental aspects. Users base the trust of the results on more than the figures. Previous brand recognition as well as opinions from previous users weigh in when evaluating the results before decision making. / Alternativ titel: Utvärdering av en Solkarta – Hushållsinvesteringar i solceller som prosument  Investering inom Solkraften ökar i Sverige, speciellt mindre installationer under 20 kW vilket är typiskt för villatak. Potentiella prosumenter kan använda en solkarta, ett interaktivt onlineverktyg, för att undersöka solpotentialen på sitt tak baserat på geografisk data. En studie som analyserade flera solkartor drar slutsatsen att resultaten varierar mycket beroende på verktyget och de antaganden som skaparen gjort. Detta examensarbete syftar till att fastställa de mest effektiva onlinekommunikationsteknikerna för att kommunicera kostnaden och nyttan av solenergi till potentiella prosumenter. Där effektiv kommunikation bygger på användbarhet, presentation och tillit. För att uppnå syftet genomförs semistrukturerade intervjuer och en teknisk verifiering av en solkarta i Karlstad. Karlstads Energis solkarta fungerar genom att be användaren att markera sin takyta och ange sin årliga elförbrukning.  Förmågan att effektivt förmedla information som är användbar, attraktiv och pålitlig baseras på användaren. Det finns inte en perfekt design som fungerar för alla användare eftersom användarna har olika kunskaper och intressen vilket påverkar användbarheten. Den presentationen som är mest fördelaktig är att använda årsproduktionen i kWh som beskrivs som en finansiell investering med fokus på besparingar från systemet tillsammans med miljöaspekter. Användare baserar förtroendet för resultaten på mer än siffrorna. Tidigare varumärkeskännedom samt åsikter från tidigare användare väger in när man utvärderar resultaten innan beslut fattas.