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questions about inverters

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Phoresic
Reg. May 2010
Posted 2010-10-08 7:30 AM (#125585)
Subject: questions about inverters


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I saw and inverter for a little over $100.  It is 1500 watts with a surge capacity of 3000.  General information would be helpful, like whether that's a good deal, whether that is just too little capacity, that kind of information.

Now, assuming that is big enough, or that I were to buy a bigger one if it isn't, could I run a small 110 refrigerator through that inverter while driving long distances.  So, the 110v refrigerator would be running through the inverter off the trucks battery.  Would there be a problem with that?

Thanks.

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JustMary
Reg. May 2008
Posted 2010-10-08 8:35 AM (#125586 - in reply to #125585)
Subject: RE: questions about inverters


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We had a weekender trailer before we bought our LQ.  My DH built the complete interior, and we opted for an inverter and a dorm-type refrigerator.  With our 2 marine batteries & 1700 watt inverter, we could travel a 3 hour round trip, and camp for 2 days.  We were very happy with that setup; both the refrigerator and inverter lasted the full 10 years that we used that trailer, even though we had read that neither unit would hold up to the trailer-travel environment.

Mary

Coyote, is that you?

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Phoresic
Reg. May 2010
Posted 2010-10-08 11:09 AM (#125588 - in reply to #125585)
Subject: RE: questions about inverters


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Thank for your answer. I see that your inverter was a little bigger at 1700 watts.  Also, you used it a little differently, though that's a good idea - just run it from the trailer batteries during transit.  Then I could recharge the batteries with the generator.

I'm still interested in knowing whether it can run from the truck batteries so that the trucks generator keeps recharging the batteries. I think the problem may be a loss of power resulting from the longer cord, but maybe using a higher quality cord would prevent a power loss. I was thinking that periodic running of the refrigerator when the headlights are not in use might provide a nice little boost in the refrigerator.

I did have another name here before but it was pbranch with some punctuation or spacing or caps - I couldn't figure it out later.  I couldn't get it to work or couldn't find it so I changed it.

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wyndancer
Reg. Apr 2007
Posted 2010-10-08 3:49 PM (#125593 - in reply to #125585)
Subject: RE: questions about inverters


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My recall of Ohm's Law is shaky....but 1700watts/12volts = 140 amps@ 12 volt

I suspect a small dorm fridge isn't much over 5 amps....600 watts

600 watts @ 12 volts = 50 amp draw.

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Phoresic
Reg. May 2010
Posted 2010-10-08 8:52 PM (#125600 - in reply to #125585)
Subject: RE: questions about inverters


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Thanks.  That's good information to consider.  I did find a little more information online - I think I'll wait to find the right one rather than just buy one that's on sale - at least for the horse trailer

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hornet
Reg. Mar 2010
Posted 2010-10-10 7:55 PM (#125640 - in reply to #125593)
Subject: RE: questions about inverters


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Your math is right, but you chose the wrong voltage. That 1700watts is at 120vac, so that would be 14amp at 120vac. The other problem to remember on the fridge is the start up current on the compressor. Generally this is listed as the locked rotor current, and is usually considerably higher then the rated amp draw.

Edited by hornet 2010-10-10 7:57 PM
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