In South Africa, on average with much more irradiation compared to the USA ,it is only feasible to install a solar system if you will go completely off grid.The fixed cost(so called line and maintenance cost) is about 60 to 70% of your electric bill.You cannot pay the solar system on savings on your kW-h consumption, you need to get rid of the total energy bill. As I said it will be doubtful if you in the States with a very much colder climate will ever be able to go off grid. In the winter you need energy to heat your homes etc from outside sources.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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