Solar Photovoltaic Basics, A Study Guide for the NABCEP Entry Level Exam by Sean White4324

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www.TechnicalBooksPdf.comElectricity basicsChapter13In order to be competent with PV, we need to be competent with electricity.Figure 3.1 Ohm’s law wheelSource: Image. Wikimedia commons. Attribution: VampireBaru. http://en.wikipedia.org/wiki/File:Ohm’s_law_formula_wheel.JPG. This file is licensed under the CreativeCommons Attribution- ShareAlike 3.0 Unported License.
www.TechnicalBooksPdf.comElectricity basicsPOWER AND ENERGYLaypeople and even newspaper reporters often use power and energy interchangeably.This is not correct and not the case for solar professionals.Power is a rate, just like speed is a rate.Power × Time = EnergySpeed × Time = DistanceWhen we leave the lights on, the cost depends upon how long we leave thelights on.Power is measured in watts and the way to remember that is that the middleletter in power is a W for Watts.Just like 1000 meters is a kilometer, 1000 watts is a kilowatt or kW.The metric system as used in the solar industry.1,000 = kilo = k1,000,000 = mega = M1,000,000,000 = giga = GWe are just moving the decimal 3 places.We talk about watts when we often speak of a 250W solar module.When we talk about the twenty 250W modules on our rooftop, we will call that20 × 250W = 5000W5000W/1000 watts per kW = 5kWWhen we talk about bigger commercial PV systems, we can talk of 4000 250Wmodules4000 modules × 250 watts per module = 1,000,000 watts1,000,000 watts/1,000,000 watts per MW = 1MWWhen converting, you are going to either multiply or divide by the conversionfactor. It should be obvious if you multiplied instead of dividedor vice versa. Make sure to use common sense rather than just memorization.22
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Solar Photovoltaic Basics, A Study Guide for the NABCEP Entry Level Exam by Sean White4324

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