NABCEP PV ASSOCIATE EXAM | Complete Questions & Answers (100% Verified)

NABCEP PV ASSOCIATE EXAM | Complete Questions & Answers (100% Verified) NABCEP PV ASSOCIATE EXAM | Complete Questions & Answers (100% Verified) An off-grid installation has a 1HP pump that is on 10% of the time and a 20W light that is on 100% of the time. What is the monthly energy use? - ANSWER - 68KWh 1HP = 746W 746W * 0.1 * 24hours * 30days = 53712Wh 20W * 24hrs * 30days = 14400Wh 14400 + 53712 = 68112Wh 68kWh What kind of ground faults do most inverters detect? - ANSWER - DC Inverters detect dc ground faults. AC ground faults are detected on the AC side of the inverter at the distribution paned (MSP, load center). Most inverters are not connected to high or medium voltage. Medium voltage is thousands of volts, large utility scale inverters are connected to medium voltage via a transformer Current carrying ability of a conductor (wire) is called - ANSWER - Ampacity According to ohms law and voltage drop, the relationship between voltage drop and current is - ANSWER - Proportional. Ohms law: V = I*R More current makes more voltage drop. This is a reason why we need a larger wire with more current, so the wire resistance is less with a larger wire and there will be less voltage drop. An array in a hot and dry place is not producing as expected in summer time. Which of the following is NOT a likely problem: a) Decreased ac wire size and voltage loss b) String size too short C) String size too long D) Soiling - ANSWER - C) String size too short. When it is hot, voltage can be low. Too long of a string would be a problem when it is too cold not too hot. When using a digital multimeter, what is the first thing you should do? - ANSWER - Inspect the meter. Always inspect first, look before you touch is the worst design error? A) BIPV on a commercial job B) A fast-growing tree to the north of an array in Idaho C) PV at 5-degree tilt at 40 degrees latitude D) Different tilt angles in a PV source circuit - ANSWER - D) Different tilt or azimuth operation within a source circuit is bad. Series connections should not have different orientations