Series & Parallel and Meter Testing

Question 1

When two or more PV modules are wired in series, voltage is _______ and current is _______ in all parts of the circuit.

Answer 1

additive; equal

Question 2

When testing the Voc of a module, what is the correct setting for a digital multimeter?

Answer 2

VDC

Question 3

A clamp-on meter is used to test circuit _________________ .

Answer 3

current

Question 4

Testing for polarity ensures__________________

Answer 4

the positive and negative conductors are correctly wired and identified

Question 5

Checking for continuity will reveal if:

Answer 5

a fuse is still operable or if it has blown.

explanation: If a fuse has blown, then there will be no path for current to flow across it, and thus no continuity.

Question 6

When measuring for correct maximum power current (Imp) of an operating PV array, which two of the following should be used?

Answer 6

pyrometer; clamp-on meter

Question 7

A crystalline silicon PV module with a maximum power point voltage (Vmp) around 36 volts is likely made up of how many individual PV cells?

Answer 7

72

explanation: Crystalline silicon PV cells typically have an operating voltage around 0.5 volts. Seventy-two of them wired in series would result in a Vmp of approximately 36 volts.

Question 8

Are typical household loads and appliances that are all on a single circuit wired together in series or in parallel?

Answer 8

parallel

Question 9

In a series connection, the positive lead of one module connects to the ____________ lead of the next module.

Answer 9

negative

Question 10

All source circuits connected to a single MPPT must have the same number of modules wired in ___________ so that all source circuits have the same voltage characteristics.

Answer 10

series

Question 11

To increase the current of a PV output circuit, PV source circuits are connected in _________.

Answer 11

parallel

Question 12

True or False: When a parallel connection is made, the current remains the same.

Answer 12

false

Question 13

Two arrays with the same tilt angle, orientation, and amount of shading are wired to separate Maximum Power Point Trackers. Each array consists of ten of the same make/model modules. The first array is wired in a single series string of ten modules. The other is wired in two series strings of five modules each (two circuits in parallel).

True or False: The total available power at STC conditions of these two arrays is the same.

Answer 13

true

Question 14

Individual circuits of PV modules in series are known as ___________.

Answer 14

PV source circuits

Question 15

When measuring for correct maximum power voltage (Vmp) of an operating array with electrically insulating gloves, _________________ and _________________ should be used. (choose two)

Answer 15

temperature sensor; probe tips of a digital multimeter