NABCEP PV ASSOCIATE EXAM WITH ALL CORRECT &
100% VERIFIED ANSWERS |LATEST VERSION |ALREADY
GRADED A+
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? ✔Correct 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? ✔Correct 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 ✔Correct Answer-Ampacity
According to ohms law and voltage drop, the relationship between voltage drop and current is
✔Correct 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 ✔Correct 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? ✔Correct 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 ✔Correct Answer-D) Different tilt or azimuth operation
within a source circuit is bad. Series connections should not have different orientations
MPPT is for ✔Correct Answer-MPPT is maximum power point tracking and will optimize the energy
harnessed from PV. Some inverters have multiple MPPTs. Charge controllers often, but don't always,
have MPPTs
Concentrated PV:
, A) Only works with direct sunlight
B) Usually has a single axis tracker
C) Will get 30% power during cloudy conditions
D) Is using heat to make electricity ✔Correct Answer-A) Only works in direct sunlight. usually works
with 2-axis trackers to always point at the sun and will not work at all in cloudy conditions.
Concentrated PV =! Concentrating Solar thermal
Fall protection should be used at heights over ✔Correct Answer-6 feet
Parallel PV circuit connections increase ✔Correct Answer-Parallel increase current. Series increase
voltage
Optimal tilt for off-grid PV system in the winter ✔Correct Answer-Latitude + 15 degrees is Optimal
tilt to maximize winter production. The sun is lower in the winter, requiring a higher tilt angle
What is the most acceptable rating of an enclosure for exposed circuit conductors mounted on an
outside wall? ✔Correct Answer-NEMA 3R
Bypass diodes are located in the
A) Combiner box
B) Inverter
C) Wiring harness
D) PV Module ✔Correct Answer-Bypass diodes are in PV module junction box. Diverts current
around a group of cells if one is shaded. Usually 3 diodes/PV module
PV array at higher elevation would tend to produce more ✔Correct Answer-Current. Higher
elevation, less atmosphere, more irradiance, more current. High elevation can also be cooler
meaning more voltage from cold temps.
How much 14% efficient PV fits on 25 Square Meters
A) 3000W
B) 4.5kW
C) 4000W
D) 3.5kW ✔Correct Answer-D) 3.5kW. 14% efficient = 0.14*1000W/M^2 = 140 W/m^2
140 * 25 = 3500W = 3.5kW
Which is the smallest conductor? ✔Correct Answer-18 AWG
18 AWG, 10 AWG, 0 AWG, 3/0 AWG
What is the simplest type of PV system ✔Correct Answer-Direct coupled is the simplest with just
PV and a load that only works when the sun is out
Sun path charts differ based on ✔Correct Answer-Latitude
Series connections increase ✔Correct Answer-Voltage. Parallel increases current
The longest shadow at 2PM would be on ✔Correct Answer-The winter solstice (12/21)
What is the ground mount advantage over a rooftop system? ✔Correct Answer-Ground mount is
cooler hat rooftop because of better airflow, meaning higher voltage
100% VERIFIED ANSWERS |LATEST VERSION |ALREADY
GRADED A+
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? ✔Correct 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? ✔Correct 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 ✔Correct Answer-Ampacity
According to ohms law and voltage drop, the relationship between voltage drop and current is
✔Correct 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 ✔Correct 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? ✔Correct 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 ✔Correct Answer-D) Different tilt or azimuth operation
within a source circuit is bad. Series connections should not have different orientations
MPPT is for ✔Correct Answer-MPPT is maximum power point tracking and will optimize the energy
harnessed from PV. Some inverters have multiple MPPTs. Charge controllers often, but don't always,
have MPPTs
Concentrated PV:
, A) Only works with direct sunlight
B) Usually has a single axis tracker
C) Will get 30% power during cloudy conditions
D) Is using heat to make electricity ✔Correct Answer-A) Only works in direct sunlight. usually works
with 2-axis trackers to always point at the sun and will not work at all in cloudy conditions.
Concentrated PV =! Concentrating Solar thermal
Fall protection should be used at heights over ✔Correct Answer-6 feet
Parallel PV circuit connections increase ✔Correct Answer-Parallel increase current. Series increase
voltage
Optimal tilt for off-grid PV system in the winter ✔Correct Answer-Latitude + 15 degrees is Optimal
tilt to maximize winter production. The sun is lower in the winter, requiring a higher tilt angle
What is the most acceptable rating of an enclosure for exposed circuit conductors mounted on an
outside wall? ✔Correct Answer-NEMA 3R
Bypass diodes are located in the
A) Combiner box
B) Inverter
C) Wiring harness
D) PV Module ✔Correct Answer-Bypass diodes are in PV module junction box. Diverts current
around a group of cells if one is shaded. Usually 3 diodes/PV module
PV array at higher elevation would tend to produce more ✔Correct Answer-Current. Higher
elevation, less atmosphere, more irradiance, more current. High elevation can also be cooler
meaning more voltage from cold temps.
How much 14% efficient PV fits on 25 Square Meters
A) 3000W
B) 4.5kW
C) 4000W
D) 3.5kW ✔Correct Answer-D) 3.5kW. 14% efficient = 0.14*1000W/M^2 = 140 W/m^2
140 * 25 = 3500W = 3.5kW
Which is the smallest conductor? ✔Correct Answer-18 AWG
18 AWG, 10 AWG, 0 AWG, 3/0 AWG
What is the simplest type of PV system ✔Correct Answer-Direct coupled is the simplest with just
PV and a load that only works when the sun is out
Sun path charts differ based on ✔Correct Answer-Latitude
Series connections increase ✔Correct Answer-Voltage. Parallel increases current
The longest shadow at 2PM would be on ✔Correct Answer-The winter solstice (12/21)
What is the ground mount advantage over a rooftop system? ✔Correct Answer-Ground mount is
cooler hat rooftop because of better airflow, meaning higher voltage
