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APPLICATION
Photovoltaic Power Systems
Photovoltaic (PV) technology is
now an alternative for energy
Issue I 2010
usage but has been developed
over many years. Some of the
harshest practical experiences
for PV operation have been in the
Polar Regions, especially for
-pv-management.com
science and research. Testing
.solar
PV in such trying conditions
www
reveals details that can help
26
manufacturers improve their
products. Tracy Dahl, Technical
Specialist at the Renewable
Energy. Polar Field Services
discusses the specific needs of
PV in polar regions.
P
V technology converts one form of Many factors must be considered when designing
energy (sunlight) into another form of any remote power system. The biggest overriding
energy (electricity) using no moving parts, factor is that all systems, regardless of the power
consuming no conventional fossil fuels, creating no source, should make energy conservation a top
pollution, and lasting for decades with very little priority. Simply put, the less power needed, the
maintenance. The use of a widely available and lesser the amount that must be produced and
reasonably reliable fuel source, the sun, with no stored. This can reduce the size, cost, and weight
associated storage or transportation difficulties and of the system dramatically. There are many
no emissions makes this technology eminently strategies that can be used to reduce the total
practicable for powering remote scientific research amount of electrical power required to perform a
platforms. given task.
The completely scaleable nature of the technology Components
also lends itself well to varying power PV panels tend to work much better in cold weather
requirements, from the smallest autonomous than in hot climates (except for amorphous silicon
research platforms to infrastructure-based systems. panels). Add a reflective snow surface and the
This technology can be limited, however, by annual output can sometimes exceed the rating for the
fluctuations in solar insolation, especially at panel. Array currents up to 20% greater than the
extreme latitudes. specified output have been reported.
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