NABCEP ASSOCIATE
1. NEC segment ________ shows the necessities for working spaces around stay electrical
device? - ANS-a hundred and ten.26
10. Where no overcurrent protection is furnished for the PV dc circuit, an assumed overcurrent
tool rated at the PV circuit Isc is used to length the device grounding conductor in accordance
with NEC ____. - ANS-10. Answer: c.
Table 250.122
NEC Article 690.45(A) refers to Table 250.122
eleven. There are to be vital hundreds on a PV system. Your analysis suggests that one uses
1900 Wh/day and operates for 6 hrs. In step with day and the other makes use of 1200 Wh/day
and operates for 3.5 hrs. What is the weighted common running time? - ANS-eleven. Answer: b.
5 hrs./day
(1900 Wh/day x 6 hrs.) + (1200 Wh/day x 3.5 hrs.) /
(1900 Wh/day + 1200 Wh/day) = five hrs. Divide top by way of the lowest
12. What is the mixed effect in wattage of the 2 hundreds within the previous query? - ANS-12.
Answer: b 620 Watts
(1900 Wh/day + 1200 Wh/day) /5.0 hrs. = 620W
13. The vital design month is the worst case situation wherein the load and the _____________
are used to design the PV system. - ANS-thirteen. Answer: d. Insolation records
14. Active method of charge control is needed via the NEC unless the most array charge
contemporary for 1 hour is much less than ____ % of the rated battery ability measured in
amp/hours. - ANS-14. Answer: b. 3%
See NEC 690.Seventy two
15. When battery temperature is high, temperature compensation ________ the VR set point to
limit the excessive over charging and reduce electrolyte losses. - ANS-15. Answer: a Lowers
16. A forty eight volt battery financial institution is used to offer strength for important loads
requiring 7458 Wh/day. Three days of autonomy are required. What is the required capacity of
the battery bank? - ANS-sixteen. Answer: b. 466 Ah
7458 Wh ÷ 48V = one hundred fifty five.Four Ah/day
one hundred fifty five.4 Ah/day x three days autonomy = 466 Ah
17. Critical loads perform for 12 hours. Three days of autonomy are required and the preferred
intensity of discharge of 50%. What is the common discharge price? - ANS-17. Answer: b.
C/seventy two
, 12 hrs./day x 3 days autonomy = 36 hrs
36 hrs. ÷ zero.Five DOD = 72 hrs. = C/seventy two
18. A battery financial institution of 500 Ah is required. The depth of discharge is 50%, the
minimal operating temperature is -10ºC and the average discharge rate is C/128. According to
the manufacturer's specifications. This yields a temperature and discharge charge derating
element of about seventy three%. What is the required battery financial institution ability? -
ANS-18. Answer: b. 1370Ah
Given 50% DOD, the battery bank need to be:
500 Ah ÷ 0.Five = a thousand Ah
Because 27% of the potential is lost due to cold temperatures per the manufacturer: 1000 Ah ÷
zero.Seventy three = 1369.Nine Ah =1370Ah
19. A battery financial institution ought to deliver 1200 Ah and could perform at 48V. The battery
decided on is an 800 Ah battery. How many 6V batteries might be required on this battery
financial institution? - ANS-19. Answer: b. 16
48V financial institution ÷ 6V battery = sixteen batteries in series to achieve voltage
1200 Ah ÷ 800Ah = 1.Five ! 2 parallel strings of batteries
eight x 2 = 16
Nothing changed into referred to about DOD.
2. What is the most range at which the solar can acquire a 90º altitude attitude? - ANS-2.
Answer: b. Approx. 23.45º north and south of the equator, however like magnetic declination,
the latitude of the Tropics varies over the years.
20. A PV gadget desires to deliver 5834 Wh according to day. The every day common insolation
is 4.8 top solar hours. The battery system charging efficiency is zero.Nine. The nominal voltage
is 48V. What is the desired array modern-day no longer together with any additional deration
elements? - ANS-20. Answer: b. 28.1A
5834 Wh/day ÷ 4.Eight Peak Sun Hours = 1215.4W
1215.4W ÷ zero.Nine charging efficiency = 1350.5W
1350.5W ÷ 48V = 28.1A
21. You are an installer known as to move a residential -axis tracker machine from Yuma, AZ to
Duluth, MN. Before reinstalling the machine what must you take a look at? - ANS-21. Answer: a.
Check the Voc. (Open Circuit Voltage)
22. For a PV array to without delay face the solar at 11 AM sun time on June twenty first at 30⁰N
latitude, at what tilt and azimuth angles ought to the modules be installed? Use the sun-direction
chart supplied. - ANS-22. Answer:
Approximately 14⁰ elevation and 63⁰E azimuth
Elevation = 90⁰ - 76⁰ = 14⁰
Note: The sum of all angles in any triangle = 180⁰
1. NEC segment ________ shows the necessities for working spaces around stay electrical
device? - ANS-a hundred and ten.26
10. Where no overcurrent protection is furnished for the PV dc circuit, an assumed overcurrent
tool rated at the PV circuit Isc is used to length the device grounding conductor in accordance
with NEC ____. - ANS-10. Answer: c.
Table 250.122
NEC Article 690.45(A) refers to Table 250.122
eleven. There are to be vital hundreds on a PV system. Your analysis suggests that one uses
1900 Wh/day and operates for 6 hrs. In step with day and the other makes use of 1200 Wh/day
and operates for 3.5 hrs. What is the weighted common running time? - ANS-eleven. Answer: b.
5 hrs./day
(1900 Wh/day x 6 hrs.) + (1200 Wh/day x 3.5 hrs.) /
(1900 Wh/day + 1200 Wh/day) = five hrs. Divide top by way of the lowest
12. What is the mixed effect in wattage of the 2 hundreds within the previous query? - ANS-12.
Answer: b 620 Watts
(1900 Wh/day + 1200 Wh/day) /5.0 hrs. = 620W
13. The vital design month is the worst case situation wherein the load and the _____________
are used to design the PV system. - ANS-thirteen. Answer: d. Insolation records
14. Active method of charge control is needed via the NEC unless the most array charge
contemporary for 1 hour is much less than ____ % of the rated battery ability measured in
amp/hours. - ANS-14. Answer: b. 3%
See NEC 690.Seventy two
15. When battery temperature is high, temperature compensation ________ the VR set point to
limit the excessive over charging and reduce electrolyte losses. - ANS-15. Answer: a Lowers
16. A forty eight volt battery financial institution is used to offer strength for important loads
requiring 7458 Wh/day. Three days of autonomy are required. What is the required capacity of
the battery bank? - ANS-sixteen. Answer: b. 466 Ah
7458 Wh ÷ 48V = one hundred fifty five.Four Ah/day
one hundred fifty five.4 Ah/day x three days autonomy = 466 Ah
17. Critical loads perform for 12 hours. Three days of autonomy are required and the preferred
intensity of discharge of 50%. What is the common discharge price? - ANS-17. Answer: b.
C/seventy two
, 12 hrs./day x 3 days autonomy = 36 hrs
36 hrs. ÷ zero.Five DOD = 72 hrs. = C/seventy two
18. A battery financial institution of 500 Ah is required. The depth of discharge is 50%, the
minimal operating temperature is -10ºC and the average discharge rate is C/128. According to
the manufacturer's specifications. This yields a temperature and discharge charge derating
element of about seventy three%. What is the required battery financial institution ability? -
ANS-18. Answer: b. 1370Ah
Given 50% DOD, the battery bank need to be:
500 Ah ÷ 0.Five = a thousand Ah
Because 27% of the potential is lost due to cold temperatures per the manufacturer: 1000 Ah ÷
zero.Seventy three = 1369.Nine Ah =1370Ah
19. A battery financial institution ought to deliver 1200 Ah and could perform at 48V. The battery
decided on is an 800 Ah battery. How many 6V batteries might be required on this battery
financial institution? - ANS-19. Answer: b. 16
48V financial institution ÷ 6V battery = sixteen batteries in series to achieve voltage
1200 Ah ÷ 800Ah = 1.Five ! 2 parallel strings of batteries
eight x 2 = 16
Nothing changed into referred to about DOD.
2. What is the most range at which the solar can acquire a 90º altitude attitude? - ANS-2.
Answer: b. Approx. 23.45º north and south of the equator, however like magnetic declination,
the latitude of the Tropics varies over the years.
20. A PV gadget desires to deliver 5834 Wh according to day. The every day common insolation
is 4.8 top solar hours. The battery system charging efficiency is zero.Nine. The nominal voltage
is 48V. What is the desired array modern-day no longer together with any additional deration
elements? - ANS-20. Answer: b. 28.1A
5834 Wh/day ÷ 4.Eight Peak Sun Hours = 1215.4W
1215.4W ÷ zero.Nine charging efficiency = 1350.5W
1350.5W ÷ 48V = 28.1A
21. You are an installer known as to move a residential -axis tracker machine from Yuma, AZ to
Duluth, MN. Before reinstalling the machine what must you take a look at? - ANS-21. Answer: a.
Check the Voc. (Open Circuit Voltage)
22. For a PV array to without delay face the solar at 11 AM sun time on June twenty first at 30⁰N
latitude, at what tilt and azimuth angles ought to the modules be installed? Use the sun-direction
chart supplied. - ANS-22. Answer:
Approximately 14⁰ elevation and 63⁰E azimuth
Elevation = 90⁰ - 76⁰ = 14⁰
Note: The sum of all angles in any triangle = 180⁰
