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  2. Solar-powered calculator - Wikipedia

    en.wikipedia.org/wiki/Solar-powered_calculator

    Solar-powered calculators are hand-held electronic calculators powered by solar cells mounted on the device. [1] They were introduced at the end of the 1970s. [2]Amorphous silicon has been used as a photovoltaic solar cell material for devices which require very little power, such as pocket calculators, because their lower performance compared to conventional crystalline silicon solar cells is ...

  3. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    Modern electronic calculators vary from cheap, give-away, credit-card-sized models to sturdy desktop models with built-in printers. They became popular in the mid-1970s as the incorporation of integrated circuits reduced their size and cost. By the end of that decade, prices had dropped to the point where a basic calculator was affordable to ...

  4. SEER-SEM - Wikipedia

    en.wikipedia.org/wiki/SEER-SEM

    SEER for Software (SEER-SEM) is composed of a group of models working together to provide estimates of effort, duration, staffing, and defects. These models can be briefly described by the questions they answer:

  5. Balance of system - Wikipedia

    en.wikipedia.org/wiki/Balance_of_system

    Cost of balance of system will include the cost of the hardware (and software, if applicable), labor, permitting Interconnection and Inspection (PII) fees, and any other fees that may apply. For large commercial solar systems, the cost of BOS may include the cost of land and building, etc. The cost of BOS can be about two thirds of the total cost.

  6. Cost estimate - Wikipedia

    en.wikipedia.org/wiki/Cost_estimate

    A cost estimate is the approximation of the cost of a program, project, or operation. The cost estimate is the product of the cost estimating process. The cost estimate has a single total value and may have identifiable component values. A problem with a cost overrun can be avoided with a credible, reliable, and accurate cost estimate. A cost ...

  7. Grid parity - Wikipedia

    en.wikipedia.org/wiki/Grid_parity

    As the LCOE of solar PV is dominated by the capital costs, and the capital costs by the panels, the wholesale prices of PV modules are the main consideration when tracking grid parity. A 2015 study shows price/kWh dropping by 10% per year since 1980, and predicts that solar could contribute 20% of total electricity consumption by 2030, whereas ...

  8. Photovoltaic system performance - Wikipedia

    en.wikipedia.org/wiki/Photovoltaic_system...

    PV performance can be measured as the ratio of actual solar PV system output vs expected values, the measurement being essential for proper solar PV facility's operation and maintenance. The primary energy input is the global light irradiance in the plane of the solar arrays, and this in turn is a combination of the direct and the diffuse ...

  9. Variable renewable energy - Wikipedia

    en.wikipedia.org/wiki/Variable_renewable_energy

    Estimates of the cost of wind and solar energy may include estimates of the "external" costs of wind and solar variability, or be limited to the cost of production. All electrical plant has costs that are separate from the cost of production, including, for example, the cost of any necessary transmission capacity or reserve capacity in case of ...

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