What doesn't move, however, is a suspended mass inside the seismograph, called the seismometer. During an earthquake, the seismometer remains still while the case around it moves with the ground shaking. Traditionally, the suspended mass was a pendulum, but most modern seismometers work electromagnetically.
Solar electricity costs about $10 to $12 a watt installed, though you may be eligible for state incentives. Check your utility bill to see your monthly usage. A robust solar electric system will cost about $20,000. You can spend as much money, to receive as much solar electricity, as you feel comfortable with.
Studies performed by the Lawrence Berkley National Laboratory have shown that adding a solar system increases a homeâs resale value by an average of $5.50 per watt, and depending on location, can be as high as $6.40/watt. 1  A 3.1kW system can add $17,000 to your homeâs value.