The closer they are to minus zero the better, and if the number is positive,
you will get slightly better performance. In the near future, it is hoped, all
ranges will be represented as a flat or positive power tolerance range.
Module efficiency —The ratio of module output ( watts ) to the sun’s input
(watts). Watts refer to a unit of electrical power. The range today is from
about 2 percent to 20 percent. If the efficiency is 10 percent, this means that
10 percent of the incoming solar radiation is changed into DC electricity.
Do not get hung up on module efficiency! It is only one part of efficiency of
the system as a whole. You need ...
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