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Inverter
FAQ |
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  Pure Sine Wave Inverters In
Stock for retail sales, click here |
Monster 2500 watt inverter includes amp meter and battery voltage
meter. |
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Custom design and manufacture of state-of-the-art battery chargers, UPS,
and power supplies for OEMs in a hurry!
For Inverter Retail Sales Click Here.
Inverter Tutorial and Frequently Asked Questions:
Q: What is an inverter?
A: An inverter takes DC
power (battery or solar, for example) and converts it into AC "household" power for running electronic equipment and
appliances.
Q: How is an inverter different than a UPS?
A: A UPS typically includes the battery and battery
charger in one stand alone unit. However, there are UPSs that use external batteries, and PowerStream makes inverters with
battery chargers, so the differences blurr as features proliferate.
UPSs also can have communication with the equipment
that it is powering letting the equipment know that it is operating on standby, giving it shutdown warning, or communicating
with the human in the loop. Inverters typically don't have this communication.
Q: Why are they called
inverters?
A: Originally converters were large rotating electromechanical devices. Essentially they combined a
synchronous ac motor with a commutator so that the commutator reversed its connections to the ac line exactly twice per cycle.
The results is ac-in dc-out. If you invert the connections to a converter you put dc in and get ac out. Hence an inverter is an
inverted converter. For more information about such converters see http://www.nycsubway.org/tech/power/rotary.html (thanks to Karl W.Berger, PE for this answer).
Q: What if I want a DC output to run such things as a laptop
from a car cigarette lighter, or telephone equipment at -48 volts?
A: Then you want a DC/DC converter. PowerStream has some
DC/DC converters just for those purposes. http://www.powerstream.com/dcdc.htm
Q: What is the difference between sine wave and modified sine wave?
A: Alternating current (AC)
has a continuously varying voltage that swings from positive to negative. This has great advantages in power transmission over
long distances. Power from your power company is carefully regulated to be a perfect sine wave, because that is what naturally
comes out of a generator, and also because sine waves radiate the least amount of radio power during long distance
transmission.
On the other hand, a sine wave is expensive to make in an inverter, and many sine wave techniques use heavy,
inefficient transformers. The most inexpensive way to make AC is to switch the DC on and off--a square wave. A modified sine
wave is scientifically designed to simulate a sine wave in the most important respects so that it will work for most
appliances. It consists of a flat plateau of postive voltage, dropping abruptly to zero for a while, then dropping again to a
flat plateau of negative voltage, back to zero for a while, then returning to the positive voltage. This pause at zero volts
puts more power into the 60HZ fundamental than a simple square wave does, so it is called "modified sine wave" instead of
"square wave."
Q: Can I use a modified sine wave inverter for my medical equipment?
A: For Medical equipment,
oxygen generators, etc. talk to the manufacturer of the equipment. PowerStream inverters are never tested or rated with medical
equipment, and we don't guarantee that they will work to save your life. For such applications please find inverters that are
rated and tested for such applications.
Q: What about square wave inverters?
A: These old-fashioned inverters are
the cheapest to make, but the hardest to use. They just flip the voltage from plus to minus creating a square waveform. They
are not very efficient because the square wave has a lot of power in higher harmonics that cannot be used by many appliances.
The modified sine wave is designed to minimize the power in the harmonics while still being cheap to make.
Q: How do I
know if I need a sine wave, or if I can live with a modified sine wave?
A: The following gadgets work well with a modified
sine wave: computers, motor-driven appliances, toasters, coffee makers, most stereos, ink jet printers, refrigerators, TVs,
VCRs, many microwave ovens, etc.
Appliances that are known to have problems with the modified sine wave are some digital
clocks, some battery chargers, light dimmers, some battery operated gadgets that recharge in an AC recepticle, some
chargers for hand tools (Makita is known to have this problem). In the case of hand tools, the problem chargers usually have a
warning label stating that dangerous voltages are present at the battery terminals when charging. We would like to add to this
FAQ any appliances that you have had trouble with, or had success with, using modified sine wave inverters.
Q: Why do I
hear buzzing on my stereo when using a modified sine wave inverter?
A: Some inexpensive stereos use power supplies that
cannot eliminate common-mode noise. These would require a sine wave inverter to operate noise-free.
Q: Why don't I
measure rated voltages when using a multimeter on my modified sine wave inverter?
A. The rated voltage is an RMS (root mean
square--they square the value to make sure it is always positive, then average it, then take the square root of the average to
make up for having squared it in the first place) measurement. Most multimeters are designed to give correct RMS readings when
applied to sine waves, but not when they are applied to other waveforms. They will read from 2% to 20% low in voltage. Look for
a voltmeter that braggs about "True RMS" readings.
Q: How should I select the right size inverter?
A: First add up
the power ratings of all the appliances, then buy the next larger inverter! At least that is the simple answer. Note, however,
that some appliances, such as table saws, refrigerators, and microwaves have a surge requirement. PowerStream inverters are
designed to supply such surges, but since every appliance has its own requirements sometimes you will need to get a bigger
inverter than you would otherwise think. Note that the inverter isn't the only consideration when you are pondering the
mysteries of startup surges. The battery must also be able to supply the surge power, and the cables must be able to supply the
increased current without dropping the voltage too much.
Q: How is a microwave rated for wattage?
A: When you buy a
microwave oven you want to know how intense the microwave field is, not how much the oven draws from the wall. So a microwave
oven that boasts 600 watts on the box, will have 1200 watts on the boilerplate in the back. Don't be fooled!
Q: Are
stereo amplifiers rated the same way?
A: Stereo manufacturers are bigger liars than politicians. Some times they use peak
output power (milliseconds), sometimes they use power drawn from the wall, but often they just look at the competition's carton
front and add 10%. However the truth is available: look at the boilerplate sticker, which has been evaluated by UL.
Q:
Why do I need such humongous cables to the battery when a small cord takes the AC output fine?
A: Power is volts times amps
(Watts = V x A). So if you have a lot of voltage you don't need many amps. Roughly you need 12 times as much current from the
12 volt battery as you need from the 110 volt AC outlet. Current is what causes cables to heat up, not voltage. That is why
they use thousands of volts in power transmission grids. The thing to do when you have lots of current is to lower the
resistance of the cable. The larger the wire the lower the resistance. Think of the cable as a water pipe. A big pipe (wire)
can carry more water (current or amperage) with less pressure (voltage), and will present less pressure (voltage) drop from one
end of the pipe to the other.
Another consideration is how far the cable has to run from the battery to the inverter. Long
cable runs are expensive, either in copper or efficiency, or both.
Q: Why would you use a 24 volt inverter instead of a
12 volt inverter?
A. At a given power rating a 24 volt inverter will need half the current as a 12 volt inverter. This makes
the entire system more efficient, and since high current transistors are expensive, the inverter will be cheaper.
Q:
Should I use aluminum wire, or must I use copper?
A: Aluminum is cheaper and lighter, but it also has higher resistance for
a given guage, and is more difficult to connect to. If you are an expert in such things, or know one, and need the advantages
that aluminum gives, go ahead. If not, why not use the best conductor, copper? (Silver is slightly better, but it is cheaper to
use a larger diameter copper). To compare the two look at our web page
http://www.powerstream.com/Wire_Size.htm .
Make sure to use good insulation, 90°C rated or better. Also, running two sets of parallel wires instead of
one can cut down on the wire heating due to more surface area.
Make sure to follow all applicable electrical codes.
Inverters must be grounded properly, and treated with respect, since they put out potentially lethal voltage. A lot of smart
people have worked for 100 years to develop rules which will keep you out of trouble if followed. These rules are called the
national electrical code, and your friend the electrician has it memorized (or knows where to look it up).
Q: Should I
use a laser printer with an inverter?
A: Only if you must. Laser printers use up a surprising amount of power (due to the
heated rollers), and will discharge your battery faster than you expect, even on standby. If you do, make sure the inverter is
rated for the power of the printer plus computer plus monitor. It doesn't do any good to have your computer brown out as soon
as the the printer starts to print. Ink jet printers, on the other hand, use a surprsingly low amount of power.
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PowerStream Technology: 140 South Mountainway Drive, Orem
Utah 84058
Phone: 801-764-9060, 9062, 9063, or 9064
 Fax: 801-764-9061 |
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PowerStream Technology
140 South Mountainway Dr.
Orem, UT
84058
Phone: 801-764-9060, 9062, 9063, or 9064
Fax: 801-764-9061
Map & Directions |
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© Copyright 2000, 2002, 2003, 2004, 2007 Lund Instrument Engineering, Inc.
All rights reserved This material is copyrighted original work. It is forbidden to use this information, text, or
graphics in full or in part on another web site without written permission. This prohibition forbids making derivative text
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