Photovoltaic Ch 11 Electrical Integration Study Guide Exam And 100% Correct Solutions.
2 views 0 purchase
Course
Solar PV Engineering and Installation
Institution
Solar PV Engineering And Installation
1. What NEC article addresses requirements for PV installations? - Answer Article 690
2. What are the nine parts of NEC Article 690? - Answer I. General
II. Circuit Requirements
III. Disconnecting Means
IV. Wiring Methods
V. Grounding
VI. Marking
VII. Connection to Other Sources...
Photovoltaic Ch 11 Electrical Integration
Study Guide Exam And 100% Correct
Solutions.
1. What NEC article addresses requirements for PV installations? - Answer Article 690
2. What are the nine parts of NEC Article 690? - Answer I. General
II. Circuit Requirements
III. Disconnecting Means
IV. Wiring Methods
V. Grounding
VI. Marking
VII. Connection to Other Sources
VIII. Storage Batteries
IX. Systems Over 600 Volts
3. Draw a diagram to illustrate the electrical integration of PV systems. - Answer
4. How to determine the maximum DC voltage of a PV source circuit or output circuit? Explain why this
voltage is important. - Answer According to Section 690.7, the maximum DC voltage of a PV source
circuit or output circuit is determined by the sum of the rated open- circuit voltages of the series-
connected modules corrected for the lowest expected ambient temperature. This voltage dictates the
minimum voltage ratings, which must be less than the maximum voltage limits of all components on the
DC side of the system, including the modules, inverter, charge controller, disconnects, and conductors.
For single family dwellings, this cannot exceed 600V.
5. What is the voltage that determines PV systems for residential systems or commercial/utility-scale
systems? - Answer 600V
6. What is the formula to calculate the maximum PV system voltage? - Answer
, 7. Describe 125% maximum current factor. - Answer This 125% factor accounts for the fact that PV
devices can deliver currents higher than their rated short-circuit current under enhanced irradiance,
possibly for more than 3 hr around solar noon.
8. How to calculate the maximum current of PV output circuits. - Answer For PV output circuits, the
maximum cur-rent is the sum of the maximum currents of the parallel- connected source circuits. For
example, a PV output circuit combining three parallel strings of modules, each with a maximum source
circuit current of 6 A, has a maximum PV output circuit current of 18 A ( 3 × 6 A = 18 A).
9. How to determine the maximum inverter input current for interactive systems and stand-alone
systems, respectively. - Answer For an interactive inverter with the PV output circuit connected directly
to the inverter input, the inverter input circuit is the same as the PV output circuit and, therefore, has
the same maximum current.
For stand- alone systems with batteries, the inverter input current depends on battery voltage. As
battery voltage decreases, the inverter input current increases to provide the same power output. At low
battery voltages and peak power output, this current can be considerably higher than the inverter input
current rating at the nominal battery voltage. Thus, the highest possible input current is associated with
the lowest inverter input operating voltage.
10. What is the formula to calculate the maximum inverter input current? - Answer
11. Describe American Wire Gauge (AWG) numbers. - Answer Larger diameter conductors have smaller
AWG numbers. Larger conductors have greater current-carrying capacity and less resistance. However,
solid (single wire) conductors can be stiff and difficult to work with, especially for larger sizes. Therefore,
conductors are also available stranded (made up of multiple smaller wires), which makes them more
flexible. Solid and stranded conductors of the same AWG size have the same cross- sectional area,
though stranding makes the diameter slighter larger. At size 6 AWG and larger, conductors are generally
only available in stranded versions.
12. What are stranded conductors? - Answer made up of multiple smaller wires
13. What sizes of AWG conductors are generally only available in stranded versions? - Answer At size 6
AWG and larger, conductors are generally only available in stranded versions.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller TestSolver9. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.89. You're not tied to anything after your purchase.
