NABCEP PV ASSOCIATE EXAM
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Terms in this set (130)
An off-grid installation has a 1HP 68KWh
pump that is on 10% of the time and a 1HP = 746W
20W light that is on 100% of the time. 746W 0.1 24hours * 30days = 53712Wh
What is the monthly energy use? 20W 24hrs 30days = 14400Wh
14400 + 53712 = 68112Wh
68kWh
What kind of ground faults do most DC
inverters detect? 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 Ampacity
conductor (wire) is called
According to ohms law and voltage Proportional. Ohms law: V = I*R
drop, the relationship between More current makes more voltage drop. This is a
voltage drop and current is 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 C) String size too short. When it is hot, voltage can
producing as expected in summer be low. Too long of a string would be a problem
time. Which of the following is NOT a when it is too cold not too hot.
likely problem:
a) Decreased ac wire size and
voltage loss
b) String size too short
C) String size too long
D) Soiling
When using a digital multimeter, what Inspect the meter. Always inspect first, look before
is the first thing you should do? you touch
is the worst design error? D) Different tilt or azimuth operation within a
A) BIPV on a commercial job source circuit is bad. Series connections should not
B) A fast-growing tree to the north of have different orientations
an array in Idaho
C) PV at 5-degree tilt at 40 degrees
latitude
D) Different tilt angles in a PV source
circuit
MPPT is for 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 in direct sunlight. usually works with
A) Only works with direct sunlight 2-axis trackers to always point at the sun and will
B) Usually has a single axis tracker not work at all in cloudy conditions. Concentrated
C) Will get 30% power during cloudy PV =! Concentrating Solar thermal
conditions
D) Is using heat to make electricity
Save
Terms in this set (130)
An off-grid installation has a 1HP 68KWh
pump that is on 10% of the time and a 1HP = 746W
20W light that is on 100% of the time. 746W 0.1 24hours * 30days = 53712Wh
What is the monthly energy use? 20W 24hrs 30days = 14400Wh
14400 + 53712 = 68112Wh
68kWh
What kind of ground faults do most DC
inverters detect? 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 Ampacity
conductor (wire) is called
According to ohms law and voltage Proportional. Ohms law: V = I*R
drop, the relationship between More current makes more voltage drop. This is a
voltage drop and current is 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 C) String size too short. When it is hot, voltage can
producing as expected in summer be low. Too long of a string would be a problem
time. Which of the following is NOT a when it is too cold not too hot.
likely problem:
a) Decreased ac wire size and
voltage loss
b) String size too short
C) String size too long
D) Soiling
When using a digital multimeter, what Inspect the meter. Always inspect first, look before
is the first thing you should do? you touch
is the worst design error? D) Different tilt or azimuth operation within a
A) BIPV on a commercial job source circuit is bad. Series connections should not
B) A fast-growing tree to the north of have different orientations
an array in Idaho
C) PV at 5-degree tilt at 40 degrees
latitude
D) Different tilt angles in a PV source
circuit
MPPT is for 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 in direct sunlight. usually works with
A) Only works with direct sunlight 2-axis trackers to always point at the sun and will
B) Usually has a single axis tracker not work at all in cloudy conditions. Concentrated
C) Will get 30% power during cloudy PV =! Concentrating Solar thermal
conditions
D) Is using heat to make electricity
