What you should know before the next time
the power goes out
The Scoop on home generators
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[DEC. 16, 2006]
I know itís too late for a warning to coincide
with the last storm that caused power to fail in Logan County. However, it
is not too soon to provide some important guidance before the next storm.
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share it in the LDN BLOG]
You all remember the icing that caused tree limbs and power lines to
grow too heavy and fall to the ground just two weeks ago. Power
poles snapped, and the result was loss of electric power for some
500,000 Ameren customers in two states, not to mention the countless
other households with other power providers that endured the cold
without power for up to 7 days. It was only a week ago that some
customers had their power restored.
Loss of household power is more than an inconvenience. You canít ask
the 17 people who reportedly lost their lives because of recent
power loss. Our lives are now constructed around the availability of
electric power, and when it goes out we seem to be helpless.
More and more this sense of helplessness sends citizens out to their
local hardware stores to purchase electric generators. Available for
as little as $299, the sales pitch says that you can restore power
to all your essential household systems. Just add gasoline and pull
the handle. Many homeowners will ignore a lot of noise if they can
just get the lights and heat back on, and maybe watch an episode of
House or ER. Face it, home just isnít home without electricity.
Hereís the rub: most of those inexpensive generators are ruining the
appliances and electronic items that you plug in to them!
Most inexpensive generators put out filthy alternating current,
causing the appliances and electronic items to heat up. Clean
current, the kind you get from the power company, is measured in
terms of stable harmonics, represented by a sine wave.
The alternating poles
of current switch back and
forth smoothly, in perfect 60 hertz frequency. Ameren states that
their power is within 5% harmonics under load. All your appliances
and electronic items were designed and manufactured to expect that
kind of power.
Most inexpensive generators put out square wave power
rather than sine wave power. The ragged edges on
the square wave power makes electronic devices react as if direct
current was being applied rather than alternating current. The
result is that the items plugged into square wave power heat up, and
are usually damaged even if only plugged in a short time on a
square-wave electric generator.
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Many homeowners tried putting all their household electronics and
appliances on their new little generators, and many experienced
plasma TVs that smoked, furnaces that popped and computers that
fizzled. Appliances suffer from shortened lives and loss of features
because of this rough, filthy, square wave power.
It would be best that if youíre going to invest in buying a
generator for the next power outage, consider the advice of David
Blankenship of Blankenship Electric in Atlanta, Illinois:
- ē A generator that puts out sine wave power generally costs
30-50% more than square wave generators. Donít shop price, shop
ē Look at the manual for the generator before you buy it. If it
shows square wave output, donít buy it.
ē Some generators say that they put out sine wave power at 5%
harmonics, but they may not put out that quality of power under
load. Check the specifications to make sure that the generator you
are considering puts out sine wave 5% harmonic power under load.
ē Just because a generator says it will power your whole household
during a power outage does not mean that it will power it with
healthy power. Many popular brand names will put out square wave
power and destroy your expensive belongings.
ē Your insurance company may not pay for appliances or electronics
that are damaged by your generator.
The next power-killing storm may happen at the end of this
current heat wave, or may not happen for years to come, we might
hope. It is never too early to be prepared to make good decisions
for our households.