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 Power Cost Per kWh. A useful figure to use when looking at solar is cost per kWh, as this can be directly compared to your current power bill. A National Renewable Energy Laboratory report spanning 7 U.S states, gives a levelised cost of solar of between $0.28 and $0.46 per kWh for residential solar systems.n example: the levelised cost of solar electricity in the 7 U.S states calculated earlier drops to from between $0.28 and $0.46 per kWh to between $0.16 and $0.31 per kWh with the federal investment tax credit [3]. Many U.S residents are eligible for additional federal and local government subsidies on top of the ITC.