AC power inverter - Club Touareg Forums
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post #1 of 10 Old 04-23-2018 Thread Starter
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AC power inverter

Has anyone used an AC power inverter?

I plugged mine into one of the front cigarette lighters and it made a whining noise kind of like a capacitor.

The same thing happened when I plugged it into the cigarette lighter on my Explorer but it was ok when I used the outlet that was designed as a power outlet.
I'm assuming the power outlet has more amperage than the lighter.

The question is, does one of more of the power outlets in the Touareg have more amperage than the cigarette lighter?
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post #2 of 10 Old 04-24-2018
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What wattage inverter
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post #3 of 10 Old 04-24-2018
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If the inverter tries to draw more power than the lighter outlet is rated for the fuse just pops. You won't see a voltage sag. I have a cheesy $20 100 watt inverter that works ok from the cigarette lighter. Never tried to do more than charge a laptop though. Sometimes it makes that capacitor type sound if I have the laptop charger plugged in when I turn the inverter on. If I turn the inverter on first and then plug in the laptop it works ok.

On the other end of the inverter quality tree is my 600 watt pure sine wave inverter. It connects directly to an extra 12VDC battery with 8 gauge cables. Never hear anything from it except the fans when it's working hard. It draws too much current to use with a lighter plug though.

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post #4 of 10 Old 04-24-2018
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Quote:
Originally Posted by HIRacing View Post
If the inverter tries to draw more power than the lighter outlet is rated for the fuse just pops. You won't see a voltage sag. I have a cheesy $20 100 watt inverter that works ok from the cigarette lighter. Never tried to do more than charge a laptop though. Sometimes it makes that capacitor type sound if I have the laptop charger plugged in when I turn the inverter on. If I turn the inverter on first and then plug in the laptop it works ok.

On the other end of the inverter quality tree is my 600 watt pure sine wave inverter. It connects directly to an extra 12VDC battery with 8 gauge cables. Never hear anything from it except the fans when it's working hard. It draws too much current to use with a lighter plug though.
Watts / volts = amps*. So 600 Watts sucks 50 Amps. 100Watts draws about 8.3Amp so even that is stretching the friendship with a 10Amp cigarette lighter outlet. (* this doesn't take into account the fact that the inverter is not 100% efficient at converting 12VDC to 240VAC, a negative factor, or that you will seldom run your inverter at its maximum capacity, a positive factor)

Another way to get your head around it is that the power (watts) in and power out is the same (assuming 100% efficiency). So 1 Amp of 240V takes 20 Amp of 12V to create it.
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post #5 of 10 Old 04-24-2018
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I'm guessing the AC plug in the cargo area was either optional or de-contented in some markets, yes??

If the 12V plugs in front are having trouble, I would hard wire it (WITH A FUSE!!) directly to the battery and maybe use a relay to turn it on and off with the ignition power if needed.

Since the battery is below the seat, you wouldn't even need to punch new holes in the firewall!!

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post #6 of 10 Old 04-24-2018
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Originally Posted by FSJ Guy View Post
I'm guessing the AC plug in the cargo area was either optional or de-contented in some markets, yes??
I am onto my second Australian Touareg. Both Owner's Manuals mentions an AC outlet but neither car had one.
I guess it has something to do with us having a 240V AC domestic supply. I don't know why VW only can bring themselves to fit 110V.
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post #7 of 10 Old 04-25-2018 Thread Starter
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Quote:
Originally Posted by FSJ Guy View Post
I'm guessing the AC plug in the cargo area was either optional or de-contented in some markets, yes??

If the 12V plugs in front are having trouble, I would hard wire it (WITH A FUSE!!) directly to the battery and maybe use a relay to turn it on and off with the ignition power if needed.

Since the battery is below the seat, you wouldn't even need to punch new holes in the firewall!!
Sounds like an idea, I''l do that.
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post #8 of 10 Old 04-25-2018
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Originally Posted by Patr80l View Post
I am onto my second Australian Touareg. Both Owner's Manuals mentions an AC outlet but neither car had one.
I guess it has something to do with us having a 240V AC domestic supply. I don't know why VW only can bring themselves to fit 110V.
I suspect you are correct.

But I'm simply surprised that North American actually got a useful feature that Australia did not!! LOL!!

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post #9 of 10 Old 04-25-2018 Thread Starter
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Originally Posted by Leedove83 View Post
What wattage inverter
About 200w I think. As I said it worked ok in the Explorer.
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post #10 of 10 Old 04-25-2018 Thread Starter
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Quote:
Originally Posted by HIRacing View Post
If the inverter tries to draw more power than the lighter outlet is rated for the fuse just pops.
I didn't have anything plugged in. It was just its static(?) load.
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