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A solar panel system is expensive. Therefore, you should reduce your energy usage by relying on alternative sources of energy for the main energy consumption. Like heating and cooking. Solar water heaters maximize the use of your roof and attic heat by moving that into your water heater. This works well under low light conditions and uses heat that is wasted in your attic space. Also, switching to CFL's or LED lighting can reduce your energy expendeture. Yes they are more expensive but the end result is longer life and lower energy usage.
Now you should take those suggestions of heating and lighting and use them. This will reduce your energy consumption. For accurate results wait at least a year. That way you can take into account seasons and personal usage. By having a reduction in energy usage the estimation on your solar powered home system will be a lot less.
Before you consider the price of a solar panel think about the environmental cost. The fact is that the solar photovoltaic panels used in both solar home energy systems and commercial applications are made using materials from the microelectronics industry....
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