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ELECTRICAL: hooking up inverter

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ELECTRICAL: hooking up inverter - 5/11/2006 11:45:36 AM   
strider380

 

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Now I'm new to this, but I wire houses and am descent with DC as well, so I purchased a 800 watt inverter that operates between 10 and 15 volts. I am in a band touring the country in a van and my game plan was to wire my inverter permanently off the battery lead and have permanent AC outlets. I figured this would more or less make a generator- - a motor powering an alternator powering an inverter giving you AC outlets. I'm not sure how most people typically install inverters but I figure:1 battery, 1 engine, 1 inverter. I know some people use two batteries, which I want to stay away from. In my mind, if I always use the inverter when the engine is running, everything will be dandy, other then a slight decrease in gas mileage. SO I did it and here's the problem. It dosn't work. When the engine is off, i test 13.5V, my inverter works excellent, but I don't want it draining my battery. When the engine is on, I tested 15.5V, over loading the 15V limit on the inverter and rendering it useless. What do I do? Is there any type of small in-line transformer I could get to drop the Voltage between 10 and 15V? Or is there somewhere else I could hook the inverter up that will get less then 15.5V? How do people usually do this? Like I said, I don't want to run off a battery that is not constantly being charged. I don't want to risk completly killing the battery and I don't want to be partially draining my battery then recharging it, as this is not good for the battery. thank you guys for any advice or tips. I only need to drop the voltage a half of a volt!!!!
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RE: ELECTRICAL: hooking up inverter - 5/11/2006 12:39:21 PM   
cwalk

 

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does the inverter have a voltage regulator or an adjustment screw or knob on it to adjust the output on it. Some do, some don't.

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RE: ELECTRICAL: hooking up inverter - 5/11/2006 1:17:17 PM   
techmanbd


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You don't need a transformer, you would need a Voltage Regulator. You are coming straight from the battery. If you haven't, I would also put in an inline fuse.

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RE: ELECTRICAL: hooking up inverter - 5/11/2006 6:40:33 PM   
strider380

 

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The unit does not have a voltage regulator on it. And as far as an inline fuse, the inverter itself has two fuses in it. I don't think I need an inline one considering the unit is already protected and I am using 6ga to wire it. Where can I get a voltage regulator? and how would I pick one that could drop 15.5V to 12V? Thanks again guys

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RE: ELECTRICAL: hooking up inverter - 5/14/2006 11:50:18 AM   
frdtek05

 

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If your alternator is putting out 15.5 volts, there's a problem. More than likely internal(alternator)or external voltage regulator, depending on year/model. It should be putting out at the most 14.5. I've hooked up a couple voltage inverters and never had a problem.

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RE: ELECTRICAL: hooking up inverter - 6/5/2006 3:53:58 PM   
strider380

 

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It now tests 14.5 .V. I've tried everything. Can't get the voltage down to 12?

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RE: ELECTRICAL: hooking up inverter - 6/6/2006 8:31:54 AM   
gmaier

 

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thats a small inverter so you best bet would be to run it from the cigerrette lighter or a power point depending on what you have. most power points will only put out 12 volts and power points or cigerrette lighters will work with the ignition off

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RE: ELECTRICAL: hooking up inverter - 1/8/2007 6:20:38 PM   
Loki2012

 

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I am a little late posting this, but ...  I would use one or two high amperage diodes wired in series.   Most diodes have a voltage drop of 0.5 to 0.6 volts, so with 15.5 volts coming in, you should see about 14.4 volts.  You may need to heat sink the diodes.  You can get a 40 amp diode from all electronic corporation for $3.50.  The disadvantage of this is the diode and the heat sink cannot touch the body of the van or a short circuit will result.  Keep in mind a 40 amp diode is only good for 480 watts at 12 volts.  The diode can handle some surge current.  Those 12 volt chargers / starter units use these types of diodes. 

Add more diodes for a higher voltage drop.  A high wattage resistor just would not work well. 



< Message edited by Loki2012 -- 1/8/2007 6:24:37 PM >

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RE: ELECTRICAL: hooking up inverter - 1/23/2007 10:25:32 PM   
elementx440

 

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quote:

ORIGINAL: strider380

I don't think I need an inline one considering the unit is already protected and I am using 6ga to wire it.


You need a fuse as close to the battery as possible, that's standard practice.  If that wire without a fuse rubs through to the chasis and shorts anywhere... you'll end up burning your vehicle to the ground...regardless of a fuse on the load, its the voltage on that wire TO the load thats dangerous

You wont find a simple voltage regulator to operate the way you need it, with that power handling.  go for the diodes...
i got a ton of high current diodes that you can have free if you pay shipping, email me....

and you can simply wire a 2nd battery in parallel for more current (longer life with the car off) if you please.

elementx440(a)hotmail.com

< Message edited by elementx440 -- 1/23/2007 10:37:17 PM >

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