In a distributed database system, a program often referred to as the database's back end runs constantly on a server, interpreting data files on the server as a standard relational database. Programs on client computers allow users to manipulate that data, using tables, columns, rows, and fields.
A 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.
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.ncentives differ between countries and states. An 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].