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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Low profile 110/115v power inverters?



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      10-05-2008, 01:13 AM   #1
web1b
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Low profile 110/115v power inverters?

Are there any you can buy that have a low enough profile to be used with the power port under the armrest (maybe an L-shaped or bendable design) and still leave clearance to shut the armrest console lid?
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      10-05-2008, 05:44 PM   #2
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Doesn't seem likely. That'd be way smaller than any one I've ever seen. Feel free to prove me wrong, though.

Why would you want one? Do you just want to leave it plugged in all the time, or do you have something to plug in that's small enough to fit in the compartment?
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      10-05-2008, 07:29 PM   #3
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I would leave a bluetooth stereo receiver plugged in to the charger all the time, so I wouldn't have to make a special effort to recharge it.

I have heard that if you use a car power adapter, it will add noise to the line when it charges, but the home charger plus inverter avoids this. Plus, using an inverter would save the cost of buying a car adapter for many things that could fit in that console storage such as cell phones.


http://www.amazon.com/review/R2U32ND...SIN=B000NWB0J0

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      10-05-2008, 11:26 PM   #4
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Quote:
Originally Posted by web1b View Post
I have heard that if you use a car power adapter, it will add noise to the line when it charges, but the home charger plus inverter avoids this.
Yes, that's true. Strapping a generator to your roof to power the adapter would also prevent hum, but it doesn't mean it's a good idea

The hum problem they're talking about is a ground loop from the system (lighter socket) ground and the audio ground being slightly off. Adding an isolation transformer anywhere in the system prevents that from happening. A 120V inverter has an isolation transformer but if you're just using one to prevent hum you're frying eggs with atom bombs.

Just get a "hum eliminator" transformer for the audio line, or if you're even marginally handy you can just pick up a low-voltage 1:1 transformer from Radio Shack (do they even still sell stuff like that) for a couple of bucks and wire it into the 12V power lead.

You might not even have any hum problem at all -- it depends on how other stuff in the car is wired and how decent the 12V adapter is (decent ones already have isolated ground).
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