Exam (elaborations)
PV Final - Study Guide based
- Course
- Studytests
- Institution
- Studytests
PV Final - Study Guide based
[Show more]
Content preview
PV Final - Study Guide basedOhm's law calculations - ANS-V=IR
Power and energy calculations - ANS-
Standard Testing Condition - ANS-25ºC (77ºF) cell temperature & 1000 W/m2 irradiance
Describe peak sun hours and sun chart - ANS-equivalent # of hours at 1,000 W/m2
Identify a type of racking systems and benefits; fixed tilt, single-axis tracking, dual-axis
tracking - ANS-
Fixed tilt racking (3, pros) - ANS-Roof mounted
Pole mounted
Ground mount
No moving parts, simpler, less expensive
Single-axis tracking - ANS-Active tracking
N/S
More efficient in all months
More expensive
More complicated
More maintenance
Dual-axis tracking - ANS-Active tracking
N/S E/W
More efficient in all months
More expensive
More complicated
More maintenance
schematic of grid-tied PV system - ANS-*pic
grid-tied PV system benefits (7) - ANS-• Increased design flexibility because the system
doesn't have to power all the home's loads.
• It is the cheapest type of residential system-compared to stand-alone or multimode.
• It requires the least amount of maintenance.
, • If the system produces more than the home needs, then the extra energy is
exchanged with the utility.
• Grid-direct systems are more efficient because batteries are not included in the
system.
• This type of system allows for the use of higher DC voltages therefore decreases wire
size, potentially a cost savings.
• You can lock in your electricity costs for the life of your system
schematic of basic battery-based PV system - ANS-*pic
battery-based PV system benefits (6, 1 subpoint) - ANS-✸ Chemical energy storage
(reversible)
✸ Energy storage for night-time and cloudy weather
✸ System (voltage) stabilization
✸ Surge current
-For starting motors or other purposes
✸ Small batteries are "portable power"
✸ Many different configurations and applications
Identify various types of inverters - ANS-
Grid-direct inverter (4) - ANS-Watts output AC
DC input voltage window- voltage of array must be in this window
AC output voltage
Frequency
• 60 Hz (U.S.) or 50 Hz (Europe)
Transformer based inverter (5) - ANS-• Uses transformer to change voltage
• Heavier than TL
• Less efficient than TL
• Also called "isolated" inverters
• The transformer means the AC and DC sides don't "touch"
String Inverters (3) - ANS-• Connects to strings of modules in series
• Typically have one to three maximum power point tracking (MPPT) channels
• Typically 1.5 kW to 40 kW AC rating
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 EXAMQA. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.21. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
78677 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now