7101-11 Introduction to Solar Photovoltaics

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57101-11 Introduction to Solar Photovoltaics The average solar irradiance is _______. - ✔✔1,000 W/m2 The organization that certifies PV installers is _______. - ✔✔NABCEP The default azimuth... angle for locations in the northern hemisphere is _______. - ✔✔180 degrees A PV cell is a type of ______. - ✔✔A semiconductor What is the voltage when the current is 20A and the resistance is 12 ohms? - ✔✔240 volts Which of the following is an example of a direct-drive standalone system? - ✔✔A DC-powered irrigation system Which of the following is true regarding a grid-interactive system? - ✔✔It provides power when there is a grid outage. What is the resistance when the voltage is 120V and the amperage is 5A? - ✔✔24 ohms Which of the following is true regarding parallel circuits? - ✔✔A parallel circuit provides multiple paths for current flow. What is the power when the current is 20A and the voltage is 120V? - ✔✔2,400 watts Wiring solar panels in series _____. - ✔✔increases the voltage but does not affect the amperage. Wiring two 20v/5A solar panels in parallel produces _____. - ✔✔20V/10A Which of the following months would be likely to have the lowest insolation values? - ✔✔December The peak sun hours for a site receiving 1,000 W/m2 for three hours and 900 W/m2 for five hours is ______. - ✔✔7.5 hours Which of the following is typically considered a BOS component? - ✔✔Wiring What is the panel operating temperature under Standard Test Conditions? - ✔✔25*C (77*F) Which of the following statements is true regarding PV power? - ✔✔PV systems help to offset power use during peak demand periods. Which of the following PV cells is likely to have the highest efficiency? - ✔✔Monocrystalline Which of the following is often the result of repeated temperature cycling? - ✔✔Burnt terminals Which of the following covers specific PV system components? - ✔✔UL Standard 1703 Each battery cell produces ______. - ✔✔2V A 80 Ah battery from which 40 Ah has been withdrawn has undergone a DOD of _____. - ✔✔50% Per NEC Section 690.71(B)(1), residential PV batteries connected in series are limited to ________. - ✔✔48V What is the effect of temperature on irradiance? - ✔✔The irradiance decreases by 50% for every ten-degree temperature increase. The best charge controller for use with sealed batteries is a ______. - ✔✔PWM charge controller Strings of solar panels are likely to be connected in a(n) _______. - ✔✔combiner box The most labor-intensive portion of a ground-mounted installation is typically the _____. - ✔✔support system installation The current electrical loads are determined during the _______. - ✔✔customer interview Straight ladders must be positioned ______. - ✔✔so that they extend beyond the roof surface by at least 36 inches The equipment manufacturing standards for PFAS systems are covered by ______. - ✔✔ANSI The fasteners installed in a PV system must _______. - ✔✔be torqued to the manufacturer's specifications A battery should be replaced ______. - ✔✔if it appears swollen The type of inverter best suited to sensitive electronic applications is a ________. - ✔✔true sine wave inverter The required free length between a worker and any hazard or obstruction when using a new 12- foot lanyard is______. - ✔✔20' Wind loads can be minimized by mounting arrays no closer than ______. - ✔✔3' from the edge of the roof The primary design consideration from the customer's perspective is almost likely the _______. - ✔✔cost For maximum power output in summer in the northern hemisphere, the tilt angle should equal ______. - ✔✔local latitude - 15 degrees Which of the following components must be protected against temperature extremes? - ✔✔Batteries Which of the following cable types is most likely to be used with a PV array? - ✔✔USE-2 Suppose a customer lives in an area with five peak sun hours per day, uses an average of 25 kWh per day during the critical design month, and desires 50% replacement of grid power. What is the required system size? - ✔✔2,500 Wh/day Inverter sizing is based on ______. - ✔✔the total wattage of all loads expected to operate at one time A loose or corroded system connection can be found by performing a(n) _______. - ✔✔selective shading test Suppose you have a 24 VDC nominal battery that is supplying a 5a, 120 VAC load with a duty cycle of 5 hours per day. What is the true battery load? - ✔✔125 Ah The roof ground should be a minimum of ______. - ✔✔6 AWG What is the voltage correction factor for a system with a winter design temperature of -10*F? - ✔✔1.20 The largest system that can be installed on 300 square foot of roof area using panels rated at 15W per square foot is ______. - ✔✔4.5 kWh Suppose a PV panel has a VOC of 20V, six panels will be connected in series, and the voltage correction factor for the location is 1.20. What is the system output voltage? - ✔✔144V Which of the following locations for a roof array is likely to experience the most drag? - ✔✔Syracuse, New York [Show More]

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