Sheikh Omar Bah showed a genuine interest in the topic of his master’s thesis. From the beginning, he was enthusiastically getting familiar with the concepts of solar photovoltaics (PV) systems comprising battery storage and he intensively studied mathematical models of the system components (PV modules, batteries, invertors, etc.). Certain problems occurred when he tried to use the models in mathematical optimization of the PV system. Some models were too detailed to be used in mathematical optimization without adopting metaheuristic optimization methods. An alternative approach of using time series of the performance data was chosen instead. Nonetheless, this led to other problems as the time series had too many data points to be easily handled by optimization tools. As the deadline for the completion of master’s thesis approached, Sheikh Omar Bah had to further simplify the optimization task to be able to complete his master´s thesis in time. The simplification of the optimization task decreased the relevance of the results. The time pressure, under which the master’s thesis was written, had a negative effect on the overall quality of the thesis.

The master thesis aim to develop optimization model of a solar photovoltaic system. The thesis has six section including introduction and conclusion. The aim of thesis is relevant, because nowadays is strong effort in EU to reduce the ecological footprint.

The level of English is poor with many grammatical errors. In some cases is very hard to understand some authors statements.

Graphical style is terrible. Most of figures should be placed in better quality (see fig. 1, 3, 4, 5 etc.). In some cases, figures and equations overflow the edges of paper (see eq. 4.5, fig. 20). Many figures are just included in the thesis, but they are not commented nor described in text (e.g. Figures 1-5, 8-10, 17, 20, 26-27, 29, 31).

The work with literature here is little chaotic. The literature should be indexed based on first author name or based on occurrence in text.

In addition, the mathematical part of work is poor. In section 2.6 Modeling, there is no mathematical background. How the model is mathematically describe? Is Eq. (4.1) on page 29 an objective function? I do not think so. This kind of work where optimization and mathematical models are presented requires a proper mathematical description. The style of equation writing is not consistent.  

Some thesis goals are not fulfilled (island operation, year-round operation) and the overall quality of the thesis is low. The results from chapter 5 are not trustable to me. From my personal impression, I feel that it is more look like bachelor than diploma thesis.

I recommend the thesis for defence, but I have a lot of doubt about it due to the mentioned serious issues.