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02-15-2014, 09:28 AM
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#1
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Member
Join Date: May 2013
Location: Laramie, Wyoming
Trailer: 2014 Escape 19
Posts: 37
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Plug in inverter
First time post - As an outgrowth of the "electrically challenged" thread discussion, I am wondering how powerful of a portable inverter can one safely plug into the stock 12v outlet? 300 watts?
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02-15-2014, 10:40 AM
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#2
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Senior Member
Join Date: Feb 2010
Location: Phoenix Metro Area, Arizona
Trailer: 2014 Escape 19
Posts: 767
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At most 15 amps and more likely limited to 10 amps - x12 gives you 180-120 watts, assuming perfect efficiency. In other words, not much of one.
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02-15-2014, 11:05 AM
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#3
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Senior Member
Join Date: May 2013
Location: Auburn, Washington
Trailer: 2013 Escape 21 #3
Posts: 385
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I use one rated at the following: INPUT: 12VDC, 15AMP, OUTPUT: 115VAC, 60HZ, 175 WATTS. I've used this for years in both my vehicle and in my Casita without issue. It also has DC and USB ports. DC is 10A at 12V, and USB is 1A @ 5V
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02-15-2014, 11:11 AM
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#4
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Senior Member
Join Date: May 2012
Location: Tiverton, Rhode Island
Trailer: 2013 Escape 5.0
Posts: 112
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__________________
Tim
Rhode Island
July 2013 Escape 5.0 / 2012 Nissan Frontier
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02-15-2014, 11:14 AM
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#5
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Senior Member
Join Date: Oct 2009
Location: Galesville, Wisconsin
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Quote:
Originally Posted by onetim
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I've got the exact same one --- somewhere, as I never use it anymore. I bought 12v chargers for all my electronics which was all I ever used the inverter for anyway...
__________________
Eric (and Mary who is in no way responsible for anything stupid I post)
"Beware of false knowledge; it is more dangerous than ignorance." George Bernard Shaw
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02-15-2014, 11:23 AM
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#6
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Senior Member
Join Date: Mar 2013
Location: Oakland, California
Trailer: not yet
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I have a 350 watt inverter that came with a lighter plug, but the plug had a 15 amp fuse inline. It also came with a cable to connect directly to the battery for use when full output was desired.
I'm pretty sure 15 amps is about it for a lighter plug.
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02-15-2014, 12:23 PM
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#7
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Senior Member
Join Date: Dec 2012
Location: Edmonton, Alberta
Trailer: 1979 Boler B1700
Posts: 14,935
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Quote:
Originally Posted by jamman
At most 15 amps and more likely limited to 10 amps - x12 gives you 180-120 watts, assuming perfect efficiency. In other words, not much of one.
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I agree, but that's still enough to run any laptop power supply (if you don't just use a direct from 12VDC supply), and a few USB power supplies or small battery chargers, all at the same time. No toasters or hair dryers...
I have a small (around 200 watt?) inverter in our van, and although it complains about low voltage unless the engine is running, it hasn't had any other problems. We have used it to run stuff such as camera and computer battery chargers - and a small heating pad - while driving.
DC outlets in cars are often marked "12V DC 120 W", suggesting a maximum draw of 10 amps and thus a bit less than 120 W (depending on battery voltage) of AC output.
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02-16-2014, 08:20 AM
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#8
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Member
Join Date: May 2013
Location: Laramie, Wyoming
Trailer: 2014 Escape 19
Posts: 37
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Thanks everyone
Thanks for the replies. We will stick with our small inverter that we have been using on occasion in our vehicles. More importantly, I see that most of our electronic devices can be charged with an USB 12 volt adapter which should be well within the limits of our 12 volt outlets.
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02-16-2014, 01:51 PM
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#9
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Senior Member
Join Date: Sep 2012
Location: Ottawa, Ontario
Trailer: 2013 Escape 19
Posts: 743
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One thing to watch with the plug-in inverters is where you plug them in.
I ran into a problem trying to charge my laptop through a plug-in inverter plugged into a 12v outlet by the stove in my 19. Escape uses 16 gauge wire by default for its 12v outlets.
With the length of the wire run to this outlet through 16 gauge wire, under load there was enough voltage drop that my inverter would give up -- if input voltage dropped under 11.5v, it would fail. This was a Canadian Tire 200W inverter.
It works fine if I use the 12v outlet under the dinette -- shorter wire run.
For those who are still putting their build sheet together, you might consider increasing the wire size for you 12v outlets if you want to be able to run an inverter or anything else that requires a fair bit of power and is sensitive to low voltage.
__________________
Doug
2013 Escape 19 ("The Dog House") , 2018 Ford F150
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02-21-2014, 12:47 AM
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#10
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Senior Member
Join Date: Feb 2013
Location: Solvang, California
Trailer: 2016 21' Escape (usetaowna a 19, a Burro and 2 Casitas)
Posts: 842
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I'm glad to see this thread ongoing. I've removed our el cheapo Harbor Freight inverter from our trailer because of the power draw. We used to use it for satellite radio and recharging my laptop. I can go from fully charged (12.7v) to 12.5v within the 2 hours it takes to charge my laptop. That's not cool!
Greg
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02-21-2014, 08:30 AM
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#11
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Senior Member
Join Date: May 2013
Location: ..., New Mexico
Trailer: 2013 Esc19/'14 Silvrado
Posts: 4,193
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Quote:
Originally Posted by dbailey
One thing to watch with the plug-in inverters is where you plug them in.
I ran into a problem trying to charge my laptop through a plug-in inverter plugged into a 12v outlet by the stove in my 19. Escape uses 16 gauge wire by default for its 12v outlets.
With the length of the wire run to this outlet through 16 gauge wire, under load there was enough voltage drop that my inverter would give up -- if input voltage dropped under 11.5v, it would fail.
It works fine if I use the 12v outlet under the dinette -- shorter wire run.
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16 gauge wire?? Feeling now, considering the intensity in "Electrically challenged" on safe wire gauge.
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Myron
"A billion here, a billion there...add it all up and before you know it you're talking real money." Everett Dirkson
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02-21-2014, 11:05 AM
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#12
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Senior Member
Join Date: Sep 2012
Location: Ottawa, Ontario
Trailer: 2013 Escape 19
Posts: 743
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It's all a matter of safe and appropriate parts for planned and possible usage.
In the case of your inverter wiring, you might be putting 50 amps through the wire. In the case of a 12V outlet, it's got a 15 amp fuse on it, so we don't need to provision for more than 15 amps.
16 gauge is safe for 15 amps and with the fuse we don't need to worry about the possibility of putting more current through it. But depending on your planned usage it might not be appropriate -- it provides enough resistance that you get enough voltage drop over longer runs that some inexpensive inverters will fail.
__________________
Doug
2013 Escape 19 ("The Dog House") , 2018 Ford F150
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