Solar Photovoltaic Basics, A Study Guide for the NABCEP Entry Level Exam by Sean White4324

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Electricity basics
when one PV module is shaded, it reduces the current through all of the PV
modules. In a series connection, if the current goes through one thing, it then
goes through whatever it is in series with.
Statistics for an average Solar PV Module:
•
An average solar module is often called a solar panel, but technically
it is a solar module.
• An average solar module has 60 solar cells connected in series. You
can see the connections going from the front of one cell to the back
of the next. (Usually the front is the negative side of the cell.)
• The average solar cell is 6 inches (156 mm) in diameter.
•
The average solar module is about 250 Watts (0.25kW) and it takes 4
average solar modules to make one kW.
• The average solar module is slightly less than 40 inches wide and
slightly less than 66 inches long.
•
A datasheet with the specifications of a solar module can be easily
found by searching “250W solar pdf” on the Internet.
Even with water flow in solar hot water systems, we can have series and parallel
connections.
An ac parallel connection would be the connections that are made at
a subpanel. Various circuits are connected together with a parallel connection.
ELECTRICAL TRANSMISSION AND DISTRIBUTION
SYSTEMS
Most often, electricity is made at huge centralized power plants at high voltages
by rotating machinery.
The voltage is stepped up for long distance transmission and then stepped
down for our use. High voltage has fewer losses.
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