Introduction: The master thesis investigates a solar cell facility over a year. A study of Levelized cost of storage (LCOS) is being used as a guideline for the economical investment revenue about battery storage as a complement to solar panels.

Method: The qualitative methods that have been utilized for this thesis are multiple document assessments as well as literature studies and calculations. The literature analysis was applied to answer all inquiries. The document assessments have been used to answer the first and second question. The calculations were used to answer the first and the third question. 

Results: The study shows that the true effect capacity of the battery, discharge time, amount of life cycles per year inclusive to the cost of electricity becomes a significant factor for the expenses in the administration. The study also shows that the usage of battery storage is currently unprofitable based on modern-day solar cell strategy. 

Analysis: The analysis uses a qualitative approach. Document analysis and the calculations are presented in a form of charts, diagrams, and graphs to facilitate for the reader. The literature inquiry has been an excellent way to navigate through the area with the information available. 

Discussion: The result discussion emphasizes both pros and cons with the battery storage for a total cost of 2 600 000 SEK with the help of document analysis results as well as previous literature concerning battery storage and LCOS. Expected price reductions in battery costs and increased electricity prices will be decisive factors for a future investment. Methods that have been carefully selected offer an insight into the usage of the battery.