What does an Inverter add? - Page 2 - Escape Trailer Owners Community

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Old 11-06-2014, 04:41 PM   #11
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charging things like cordless tools is handy, as well. most need a pure sine power supply. Computers also are fussy, tho it's actually cheaper to just buy a computer specific 12V adapter ($20+)

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Old 11-06-2014, 04:50 PM   #12
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Housekeeping! I use a vacuum to clean Ten Forward. There's no electricity available where the 5er is stored. But, since I have an inverter and the batteries are fully charged, I can clean it anyway.

Okay, that's a lame excuse for needing one. But it works for me!
Thats ok Donna I have one mosltly to make coffee quickly while traveling on the road. I justified it to my female family members that they could use a hair dryer and curling iron while not plugged in.
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Old 11-06-2014, 05:02 PM   #13
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The trailer's 12 volt system is DC . A transformer only works on AC (AC in AC out) Are the speakers 12 volts AC or DC ? Just curious
Good question. All I know is that it works. I think I should have referred to it as a Transformer/Converter. I have a half a dozen or so of these lying around the house and they all say 120VAC in and various V DC out. The inverter puts out 120V AC. The little 120 V AC transformer/converter that comes with the speakers plugs into the inverter and the transformer/converter outputs the 12V needed by the speakers. I assumed it was 12v DC but obviously if the 12 V requirement is AC that would explain why the speakers wouldn't work when hooked up directly to the trailer 12V DC. Interestingly, with a previous camper I installed an under cupboard kitchen style TV. It came with the same kind of transformer. When I bypassed the transformer and connected the TV to the 12 V DC it worked fine for several years until we sold the camper. I can rewire a car but electronics are a mystery to me. The trailer with the speakers and manual are in storage so I can't check that right now.
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Old 11-06-2014, 06:08 PM   #14
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Steve; I think you have hit the nail on the head. Just out of curiosity I checked the speaker manual and found that the speaker power input is 12V followed by a symbol that has a bar with a small sine wave below. Not your regular AC symbol which is a sine wave alone nor the standard DC symbol; a bar with 3 dashes below. I could not find this symbol on a brief internet search.
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Old 11-06-2014, 09:45 PM   #15
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What is the "loss" when converting 12 volt to 110 using an inverter? Does it make a difference?
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Old 11-06-2014, 09:52 PM   #16
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Your basic inverter changes 12v DC to 120v AC so you can run your AC appliances. Some appliances require a sine wave inverter to work properly. Some actually put out a modified square wave that approximates a sine wave. I have used such in the past to operate computer printers when on the road.

What do you need to operate and what are the wattages?

There is some power loss in the inversion process, so it would be better if you could use DC appliances?
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Old 11-06-2014, 09:55 PM   #17
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What is the "loss" when converting 12 volt to 110 using an inverter? Does it make a difference?
Conversion loss used to be around 15% for most inverters, but I think it's come down to 10-11% with the improvements in solid state device technology.
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Old 11-06-2014, 10:48 PM   #18
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What is the "loss" when converting 12 volt to 110 using an inverter? Does it make a difference?
Alot depends on the efficiency of the inverter, but the gauge and length of the wiring will affect it as well.

This link has a basic reference chart that calculates the loss per foot of wire based on wattage and gauge:

http://www.doityourselfrv.com/rv-inverter-install-diy/
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