Photovoltaics - Compare two Months
Comparing yield data from two time spans, for example, the best and worst months of a year. The electricity yields from photovoltaic systems from any time span can be compared here. Often, yield data is available for one month, but months of course vary in length, from 28 to 31 days. For the comparison to be meaningful, these different lengths must be taken into account.
Please specify two yields and their durations. The units for electricity yields are often kilowatt hours (kWh). However, any unit can be used, as long as the units are the same for both. This also applies to the durations; days is a reasonable specification, but other time specifications are also possible. The ratios of both yields are calculated, i.e., how many times yield 1 corresponds to yield 2, and vice versa.
Examples:
1. A pitched roof system generated 896 kWh of electricity in June 2025 and 84 kWh in December 2024. June has 30 days, and December has 31. The ratio here is approximately 11 to 1. This value is so high because the system was partially covered in snow in December.
2. Over the same annual period, a smaller vertical wall system had its best month in April 2025 with electricity generation of 180 kWh and its worst month in December 2024 with 71 kWh. April has 30 days, December 31, resulting in a ratio of 2.62 to 1. The yield in the dark month of December was 0.382 times April's yield, these are 38.2 percent, which is another way of expressing such a ratio.
In regions with seasonal fluctuations, such as Central Europe, higher yields can of course be expected in summer than in winter. There are various ways to install photovoltaic modules. They are often slanted, sometimes they are horizontally or vertically. The steeper they are, the lower the yield ratio between a summer month and a winter month will be. Slanted systems, such as those found on many roofs, often have a ratio of the best to worst months of the year of around 6 to 1, i.e., six times the yield in the best month. Horizontal systems have a ratio of about 10 to 1, vertical systems 2.5 to 1.
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