12-Volt Transformers
TJB-INC sells several brands of 12-volt transformers
to power low-voltage lighting. We offer Hampton Bay,
Malibu, & Aquascape Inc transformers available in
output wattages from 88 watts to 600 watts. Some with
mechanical timers and others with photocells either built-in or
remote.
Low-voltage,
systems have several advantages for the home owner: Most
important, low-voltage equipment is easier to install. Except
for the transformer that's connected to a 120-volt circuit, the
entire system runs on harmless 12-volt current. Low-voltage wiring
is lightweight and can be laid on the ground or buried just below
the surface. Another advantage of low-voltage equipment
is that it can be relatively inexpensive. And, when you do the job
yourself, the bottom line for low-voltage looks even better. Not
only can the capital outlay for a standard high-voltage system be
much greater, but you may need to hire a pro for part or all of the
installation.
You must size
your low voltage transformer to match the combined wattage of the
lights or lamps to which the transformer is to supply power plus
approximately 25% more for the line.
Sizing your Transformer
Example: If you buy a system that comes with six fixtures
and each fixture has a 12 watt lamp, then you have a minimum need
of 72 watts (12 x 6 = 72). The line itself
degrades the wattage as well so as a general rule of thumb you will
need to increase it by 25% more. Therefore
you'll need at least a transformer that can handle about 90
watts. So a 100 watt transformer would be the
minimum needed. If you plan to add additional fixtures
in the future, you may want to increase the wattage of the
transformer or purchase additional transformers as
needed. Keep in mind that the voltage drop over long
distances is more pronounced in a low-voltage system, therefore,
using wire that's too light (skinny) can affect the output at the
lamps and this may adjust the wattage need of your low voltage
transformer.
