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.
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. solar energy system big enough to power a computer and a few other small items might cost you about $700 to $1000. These are also well suited for RVs, boats and camping. Learn more about portable solar energy units.