Ten modules, each with Voc = 40.5 V, are wired in series. What is the string's open-circuit voltage at STC?
Answer in V.
Show the answer
405 V
Voltages add in series: 10 × 40.5 V = 405 V.
Reference: Series connections: string voltage
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Sizing practice questions
25 questions from the solar pv fundamentals practice test.
Sizing practice test
10 questions, graded as you go, with the reason for every answer. No sign-up.
What this covers
- Series strings
- Parallel strings
- Array power
- Array sizing
- Voltage limits
- Circuit current
- Inverter output
- Energy production
- System design
- Loads
- Batteries
- Charge controllers
- Interconnection
- Voltage drop
Sample questions
Three identical strings, each with Isc = 9.8 A, are combined in parallel. What is the combined short-circuit current at STC?
Answer in A.
Show the answer
29.4 A
Currents add in parallel: 3 × 9.8 A = 29.4 A.
Reference: Parallel connections: array current
An array has 24 modules rated 375 W each. What is the array's STC rating in kilowatts?
Answer in kW.
Show the answer
9 kW
24 × 375 W = 9,000 W = 9.0 kW.
Reference: Array sizing: STC power