![]() ![]() Besides solar cells you must have wind mills, water New nation-wide infrastructure that includes different ways to produce and The smart thing to do, of course, is to create a Many companies at present offer suitable batteries You might, for example, store enough electrical energy for a few days in someīatteries in your basement. ![]() There is no choice, you must now get your electrical energy from It's dark, man! When the sun is not shining, your solar cells are not You figure if that is attractive or not.Ībout the times when the sun is not shining? You need and no more electricity bills for the next 20 - 40 years since (good) In other words: You will have all the electricity If done right, income and costs cancel each other ![]() Your utility hates doing this, so you need a government that sees to When you produce more than you need and bill you when you use more than you You also need a contract with your local utility where they pay you So let's say you end up with 8 000 $ - 10 000 $ now and less in the nearįuture. Must pay for fixing the modules on your roof, hooking up everything, and so on. Modules or 3 000 $ for the 30 m 2 you need. Presently (May 2013) you pay about 100 $ for 1 m 2 Surprise! This is probably far less than you would have My total needs, including the indirect use Thus can be met by about 15 m 2 of solar cells on my roof top All my direct electrical energy needs ( 2 500 Wh) The average energy produced in one year per square meter thus is 20 W Square meters of solar cells do I, personally, need to cover all my electricity W/m 2 sun light energy, 20 W/m 2 will make it to It means that from my yearly average of 100 Good mass-produced solar cells that are on the market now (end of 2012) have aĬonversion efficiency around 20 %. Light power goes into a 1 m 2 solar panel. Large is the conversion efficiency of solar cells?Īn efficiency is simply the relation (in percent) between what comes out Or, expressed in power, 5 000 kWh/8 760 h = 570 W. The relation between my direct and indirectĮlectrical energy needs is - roughly - 50: 50, and the total per capita comes to about 5 000 kWh/a Taxes and prices for products and services. For all thisĮlectrical energy I pay indirectly through Transporting the beer I drink needs some electricity, and so on. My office features lights and other electricalĭevices, and so does the opera theater where I hang out. Second, I use it where I work and hang out,Īnd in the products that I buy. First, I use it at the place where I live, and for I, personally, use electrical energy in two ways. The Bavarians down south have a bit more sun and thus harvest a bit more (black circle, all the way up), so 1 000 kW/m 2 is not tooīad. Just for the hell of it, I give you some precise Harder than slaves, indeed, but are not quite as useful in jobs like diggingįor ore, forging swords or sharing beds with. Typical household appliances run from 50 W (small TV) up to a few kW Relatively smart power source treasured by most of the great cultures in The power produced by a typical hard-driven slave, the ubiquitous and You go more leisurely and take breaks for sleeping, eating and going to theīath room, your daily average may be around 50 W. If you goįull blast on a bicycle, you produce around 200 W - if you are good. 1 W equals 1 J/s (Joule per second), and a Joule is theīasic measure of energy. Solar cells covered with leaves, dust, or bird shit will not produce as much Keeps the surface of solar cells clean and thus has also positive effects. Problems if it is really hot! Rain does decrease light intensities - but also Solar cells work best if they are cold, they encounter serious My deplorable lack of sun and surplus of rain and snow is not quite as bad as Where I live, (at a latitude north of Maine) there is far less sun, a lot ofĬlouds, it's cold, and it rains a lot.
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