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The '''solar coverage rate''' is the percentage of an amount of [[energy]] that is provided by the sun. This may be in reference to a [[Solar water heating|solar thermal installation]] or a [[Photovoltaic system|photovoltaic installation]], i.e. a calculation of solar heat, [[electricity]] or total energy produced. The observation period is typically one year. As a general rule, higher values represent improved [[Energy efficiency (physics)|energy efficiency]] and improved environmental outcomes.▼
▲The '''solar coverage rate''' is the percentage of an amount of [[energy]] that is provided by the sun. This may be in reference to a [[Solar water heating|solar thermal installation]] or a [[Photovoltaic system|photovoltaic installation]], i.e. a calculation of solar heat, electricity or total energy produced. The observation period is typically one year. As a general rule, higher values represent improved energy efficiency and improved environmental outcomes.
== General ==
The solar coverage rate is used for need-based planning of solar installations and is a measure of the energetic (non-)dependence on [[energy sources]] other than the sun.
Differentiation between solar coverage rate for buildings for:
* [[water heating]],
* [[room heating]],
* required overall heating,
* [[electricity generation]],
* required total energy.
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== Cost effectiveness ==
The solar coverage rate cannot be used as the only measure of the [[Cost-effectiveness analysis|cost effectiveness]] or quality of a facility. Other conditions must be taken into account. Among other factors, the value depends on the size of the facility, the ___location and orientation of the collectors, the size of storage available and the amount of energy required. A solar coverage rate of 100% would mean that the system's entire energy requirement can be covered by solar energy. For a solar thermal facility in Europe, this would mean that the entire heat requirement could be covered, even on a cold winter's day. On summer days, however, this same facility would produce a very large surplus that could not be used. The facility would have to be heavily over-dimensioned for the summer and could not necessarily be operated economically. A high level of coverage is therefore not always an advantage. Nevertheless, if very high coverage levels are to be achieved, then solutions can be offered in a local heat network.
When planning a solar thermal facility, the optimal goal is to find a balanced compromise between yield, i.e. heat energy provided, and the solar coverage rate. A good compromise between yield and solar coverage usually also represents a good compromise between investment costs for the solar facility and costs saved on conventional energy.
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