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Revision D
Harbortronics LLC 8 1/5/2007
Mechanical Package
We can also provide the enclosure with mounting hardware. This package includes the external mounting bars as well as an internal
stainless steel mounting plate with right angle bracket, desiccant pack, felt and tools, for $422.63.
The internal stainless
steel panel provides
a solid base to mount
the camera and all
other components.
The panel can be
easily removed for
service, and then just
dropped back in
place. The panel
doesn’t need to be
removed for typical
use.
Battery Pack Assembly
We can supply a high capacity Lithium-Ion Polymer (LiPoly) rechargeable battery pack, having a nominal voltage of 11.1V, and
12.3AH capacity. A ‘universal AC’ battery charger is included. The battery pack assembly is priced at $375.86.
The most common battery chemistry for long term, remote applications is lead-acid. Unfortunately, lead-acid batteries have a number
of drawbacks. An equivalent capacity lead acid battery would add about 8 pounds to the system, and would be almost as large as the
housing itself. ALL Lead acid batteries (even the sealed ones) can vent gasses during charge and discharge, making them inadvisable
to install within a sealed housing. Most other secondary (rechargeable) battery chemistries have high self-discharge, meaning that
they won’t work well in a long term application. LiPoly batteries however, have low self-discharge, are very light-weight, and quite
compact. Good stuff, but not cheap!
The advantages of the LiPoly
battery pack for this application
outweigh the significantly
higher price, and allow the high
capacity battery to reside inside
the housing, making the entire
unit quite portable.
In order to save some money,
one customer ordered the
housing without the internal
battery, for connection to a
large, less expensive battery
outside the housing (i.e.
motorcycle battery). We have a
report that this worked well, up
until the time that arctic foxes
chewed through the cable!
Actually we’ve heard from a number of researchers over the years that electrical cables are a big attraction to a variety of wild
animals. If you really want to hike in a big heavy lead-acid battery, that’s fine, but you way want to also bring some armoring for the
cable!