[Q57-Q74] Best Quality PVIP Exam Questions NABCEP Test To Gain Brilliante Result!

Q57. A PV system is located at 41 N latitude. The sun angle is 23 on December 21 at solar noon. Assuming that the
65 ft tree is directly south of the PV array and will grow 20 ft. over the life of the PV system, what is the MNIMUM distance the tree to the button of the prevent shading?

Q58. A grounding electrode is required at the location of all ground-mounted and pole-mounted PV arrays. Which typeof grounding electrode is NOT permitted for arrays. Which type of the grounding electrode is NOT permitted for array grounding?

Q59. Which circuits are on the utility side of a service point?

Q60. A site has an average wind speed of 25 mph and is classified as Exposure Category C per ASCE 7. What is the minimum wind design speed for the PV array structure?

Q61. Which temperature coefficient is used in the calculation to verify energy production of a PV system?

Q62. A 10 kW PV system produces 8 kW AC under STC. After one year, output drops to 7.2 kW. What is the most likely maintenance issue?

Q63. A microinverter system uses 30 modules, each rated at 320W, with an inverter efficiency of 96%. The AC output is connected to a 208V three-phase service. What is the total three-phase power output?

Q64. A PV array’s tilt is 30° at a latitude of 40°N. What is the winter energy loss compared to optimal tilt?

Q65. A 10 kW array produces 14,000 kWh annually. What is the specific yield in kWh/kW?

Q66. A ground-mount array uses driven piles with a lateral load capacity of 500 lbs. The wind load calculation yields a lateral force of 600 lbs per pile. What must be done?

Q67. When installing a ground-mounted PV array, which of the following grounding methods complies with NEC Article 690 requirements for equipment grounding?

Q68. A 10 kW system has a total derate factor of 0.85 and operates at 5 PSH. What is the daily output in summer with 10% soiling loss?

Q69. A 20 kW system has a measured output of 18 kW at STC. What is the total system loss?

Q70. A ground resistance measurement on a newly installed grounding electrode indicates a resistance of 130. The earth connection may be improved by connecting the existing electrode to a:

Q71. A grid-connected PV system on a dwelling is producing 30% less power than expected. The conductors from threes strings of modules enter into a 3-pole fused dc disconnect, and each ungrounded conductor is connected to a separate pole. On the inverter side of the switch terminals, the three strings are combined. The dc disconnect switch is opened. The voltages on the array side of theswitchare 440 on string #1, 444V on string
#2, and 0V on string #3. The dc disconnect is then closed and the inverter resumes operating, still producing about 30% less power than expected. A clamp-on ammeter is used to measure the dc current of each string of each string of modules where they enter the rooftop junction box. The operating currents of each string are
3.9A for string #1, 3 85A for string #2, and 4.3 A for string #3. What is the MOST likely with the system?

Q72. A grid-tied PV system uses a transformerless inverter with a maximum DC input of 1000V. The array consists of 20 modules, each with a Voc of 45V. What is the NEC 690.7 correction factor for a low temperature of -15° C if the temperature coefficient is -0.30%/°C?

Q73. A 12 kW array has a measured output of 10 kW at STC due to mismatch losses. What is the mismatch loss percentage?

Q74. A designer is selecting a charge controller for an off-grid system with a 6 kW PV array and a 48V battery bank. The array Isc is 130A. What is the minimum current rating for the charge controller?