Bumpyroad
Virginia
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the oxygen concentrator I am purchasing sez that it will run on 12 V with a "full sine wave" inverter. I assume we are talking expensive, it is only 350 watts. do the ads give this information as a rule???
thanks,
bumpy
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ScottnSherrie
Augusta, GA
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Inverters will usually always tell you the type of wave, especially if it is a true sine wave inverter. The other type uses terms like modified or square sine wave.
The true sine wave are more expensive, but one can be had without breaking the bank if you go for one in the 600 watt range.
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dmartin@newarts.com
Ames, IA
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the oxygen concentrator I am purchasing sez that it will run on 12 V with a "full sine wave" inverter. I assume we are talking expensive, it is only 350 watts. do the ads give this information as a rule???
A modified sine wave inverter may work ok. This has been the case for at least 5 different oxygen concentrators I've used. (The mfg of your inverter may simply be being conservative & has not tested the device with all inverter types.)
In my experience you'll need something a 700 watt or larger inverter to start your concentrator's motor; you'll have to experiment(electric motors can take up to six times their rated power during startup.)
Dave
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smkettner
Southern California
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Samlex pure sine wave 300 watt $149, 600 watt $259. Does it have a high and low setting? I bet the 300 watt would work if you run it on less than max setting.
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wa8yxm
Wherever I happen to park
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One word to those pushing MSW.. The maker of the device says FULL SINE WAVE or TRUE SINE WAVE.. I would believe them
This is a vital piece of medical equipment... Trying to cheat can lead to it failing, a refusal of the supplier to replace under warranty and DEATH.
Do as the maker says and use a proper TRUE SINE WAVE inverter
The post just above this lists a couple of them. I use a Prosine 2.0 myself but since 2, is just about what it cost installed (That's 2, comma, zero zero zero) (Amount rounded slightly) I'd not call it inexpensive.. I would call it very nice though. Will run my TV and the microwave all at the same time.
Nothin adds excitment like something that is none of your business
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Bumpyroad
Virginia
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smkettner wrote:Samlex pure sine wave 300 watt $149, 600 watt $259. Does it have a high and low setting? I bet the 300 watt would work if you run it on less than max setting.
the 600 watter for $259 sounds interesting. but if the compressor takes up to 700 watts starting up, would be pushing it. the 1000 is a tremendous leap +$200 more.
does pure sine wave equate to full sine wave???
thanks
bumpy
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tpi
Southern CA.
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http://www.samlexamerica.com/customer_su........df/Pure%20Sine%20Inverter_Commercial.pdf
The Samlex 600 watt pure sine has a 1000 watt surge rating (see above). I have the 300 watt version and am pleased-works great with TV, laptop, etc with no interference. Fan only runs when necessary for cooling-and it doesn't run much.
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melton
Glen Allen, Virginia
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Bumpyroad wrote:
does pure sine wave equate to full sine wave???
thanks
bumpy
Bumpy, I'm not sure that 'full sine wave' is what the manufacturer really meant. If you are familiar with normal 120 volt AC (alternating current), and look at it on an scilloscope, it goes back and forth from negative voltage to positive voltage 60 times per second (60 cycles). This is FULL sine wave (or whatever wave form it is) as opposed to HALF sine wave, which is what you would get if you added a diode into the circuit, so that you got only either the positive or negative voltage. For all practical purposes, this does not exist in modern real-world applications. I hope that answers your question, but it may have just made it that much more confusing.
I suspect that the important part is the SINE wave. But i would suggest contacting the manufacturer about the possibility of a modified sine wave, and ask about startup current draw before you make an investment in any inverter for that purpose.
forrest
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smkettner
Southern California
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Bumpyroad wrote:does pure sine wave equate to full sine wave???
Pure sine wave is equal to the sine wave found in utility power.
I agree the 600 watt (with 1000 watt surge) should work fine.
If you want it built in consider the WFCO 600 watt (800 surge) $300. This has a transfer switch so it could feed the outlet near where you need it and pass through utility power when connected (10 amp limit).
More reading:
12 volt side of life, part 2 inverters
Inverters by Phred
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PrairieGoat
Colorado Springs, CO
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A couple of other things to think about....
Most inverters are around 85% efficient. That means if you need 600 watts, approx. 706 watts will be pulled from your batteries.
706 watts will be approximately 58 amps being pulled from your batteries. 2 6v golf cart batteries (225Ah) or 2 12v (200Ah) will only give you about 4 hours of run time at that rate. It is also recommended that you don't run deep cycle battery much below 50% too often, so that would only give you 2 hrs.
I've run these same numbers with the thought of running my O2 concentrator, but the draw is just too much when dry-camping. You might want to look at one of the "portable" concentrators (the name escapes me at the moment). They are a bit pricey (~$5000), but they draw a lot less power. The downside is they only have a maximum of 3 lpm or so.
Randy
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