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.
The price of residential solar power On average the total cost of solar installation can be between $15,000 to $29,000 for average sized systems sized between 4kW and 8kW.2 Sunrun solar lets you get started for as little as $0 down and helps you lower your electric bill.