Self-consumption. that you need to purchase from your power company. Bosch Solar Energy recommends photovoltaic systems with self-consumption.

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1 Self-consumption of Solar Energy Bosch Solar Energy

2 Self-consumption The self-consumption of solar energy refers to the proportion of energy which is used directly in the building where a PV system is located. When a photovoltaic array on a building produces electricity and this electricity is used to power a washing machine, for example, this is referred to as self-consumption. It's important that the electricity needed for internal use is neither fed into nor drawn from the public grid. Self-consumption pays off twice! First of all, the amount of energy consumed is subsidized by the state. And secondly, using energy that you have generated yourself reduces the amount of energy that you need to purchase from your power company. Bosch Solar Energy recommends photovoltaic systems with self-consumption. Self-consumption Generation Consumption Feed-in Supply

3 Natural Self-consumption Every household uses energy on a daily basis. The amount of electricity used varies over the course of the day, from season to season and, of course, when the weather changes. At the same time, the energy supplied by photovoltaic systems also fluctuates over the course of a day, at different times of year and depending on the weather conditions. Self-consumption is calculated as the ratio of directly consumed energy to generated energy. Natural self-consumption is a statistical value. It indicates the proportion of solar power generated by a photovoltaic system with a specific output that a household of a certain size can use without conscious changes in behavior or the use of technical components. The natural self-consumption rate is usually about 20 % for a one-person household and about 40 % for a fiveperson household and a 5 kwp system. Natural Self-Consumption Theoretical comparison between power generation and power demand 6 a.m. 10 a.m. 2 p.m. 6 p.m. 10 p.m. Generation Consumption

4 Optimized Self-Consumption Self-consumption quotas can be increased by implementing simple optimization measures. Either by changing user behavior (manual optimization): Scheduling the use of household appliances, such as the washing machine, drier and dishwasher, at times when the sun produces the most energy Or, with specially designed technical solutions: Intelligent household appliance controls Appliances with time delay functions Appliances which store energy themselves for automatic use at a later time. This technology should be possible in the future with new types of batteries (electricity storage) and materials (storage of heat /cold). Optimized Self-Consumption Theoretical comparison between power generation and power demand 6 a.m. 10 a.m. 2 p.m. 6 p.m. 10 p.m. Generation Consumption The basis for all data, calculations and models given is the system described below (as of January 2012). A simple roof-top system with 5 kwp, statistical annual energy output of kwh, 4-person household, statistical annual energy consumption of kwh, statistical self-consumption rate 35 %, without taking into account discounts and taxes.

5 Self-consumption pays off! Sinking feed-in tariffs combined with steadily rising energy costs are making self-consumption a key factor for the economic feasibility of a photovoltaic system. It is becoming more and more important for customers to be able to use as much of their own self-generated solar energy as possible. Independence With solar energy generated by a photovoltaic system, you can become your own electric company. The use of self-generated solar energy not only makes you less dependent on commercial energy suppliers, but also helps reduce our reliance on conventionally produced energy from fossil fuels or nuclear power. Savings Potential By using solar energy that you have generated yourself, you can reduce the amount of electricity that you need to "buy" from the public grid. This helps reduce your electricity bill on a regular basis. Plus, you'll save even more money every time the electric companies raise their prices because you can always use the electricity you have generated yourself for free. Security for the Future With high-performance solar modules from Bosch Solar Energy, anyone can generate and use electricity safely and with long-term security. As a well-established company with a successful history stretching back over more than 125 years, Bosch is a truly reliable business partner. Plus, having your own photovoltaic system reduces your household's CO 2 balance and contributes to the move toward environmentally-friendly and sustainable alternative energy sources that can help secure a better environment for us all. Increased Cost Savings Effect Intelligent storage solutions designed for time-delayed power consumption are becoming more and more important as they enable the most efficient internal use of self-generated solar energy. Self-collected solar energy can thus be used even when the sun is not shining. This increases the percentage of self-generated energy that you can use yourself and only the energy that you do not need is then fed into the public grid at the current feed-in tariff.

6 Your specialist installation company will be delighted to help you further! Premium quality solar modules from Bosch Solar Energy are an important cornerstone for high energy yields over the long run and, most importantly, they make an important contribution toward the protection of our Bosch Solar Energy AG Robert-Bosch-Strasse Arnstadt Germany Tel. +49 (0) Fax +49 (0) You can get more information about solar energy from: Printed on 100% recycled paper. Issued 05/2012 environment.

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