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

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Electricity basics
Convert to kWh
2472Wh/1000 Wh per kWh = 2.472 kWh
On a test or in real life, this could be rounded off to 2.5 kWh for the correct
answer.
Remember that on the NABCEP tests, there are always 4 choices to
choose from and you should make sure that your answer seems right.
Remember that all good exam questions have wrong answers that
were carefully thought out. Be careful of getting your units right and
do not confuse Wh with kWh. You should have plenty of time for the
NABCEP Entry Level Exam, so do not rush. Make sure your answer
makes sense. I like to take an educated guess at the range of right
answers before I complete the problem. Another common mistake is
moving the decimal in the wrong direction when converting kWh to
Wh. Remember that when converting to large units, your final number
will be smaller. Every time you do math, make sure your numbers make
sense. Even the smartest people make simple mistakes.
Common mistake:
Energy is kWh not kW/h or kW
BATTERY MATH
When talking about battery capacity, the term Amp Hour is commonly used.
An Ah is an amp for an hour. Amp hours are easily converted to Wh.
Ah × V = Wh
A 6 volt battery that has 100 Ah has:
6V × 100Ah = 600Wh
A 12V battery with 100Ah has:
12V × 100Ah = 1200Wh
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