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.
Generally, Solar PV systems that generate electricity from sunlight cost between $2.50 to $7 per installed watt. Typically, the larger the system, the lower price per watt.Large commercial systems are typically well below $4 per watt.Residential systems, because of their smaller size are usually somewhat higher. For example, in Ohio a 5 kW residential system with an average monthly production of about 530 kWh would cost approximately $19,000 or about $3.77 per watt.Larger systems have a significantly lower cost per watt.or example, in Ohio a 5 kW residential system with an average monthly production of about 530 kWh would cost approximately $19,000 or about $3.77 per watt. Larger systems have a significantly lower cost per watt.