On adding inside outlet for plugging in USB - Page 3 - Fiberglass RV


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Old 03-08-2014, 10:03 AM   #29
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http://www.mikegyver.com/Store/

This guy has been building options for charging MacBooks without AC power for years. I have a 12volt charger from him. It works well. You still need to have a source of 12volt power though. The battery will not last forever without being recharged.

As for USB charging for iPods, iPads and iPhones -- not all USB chargers are created equal. The cheap ones will manage a iPod but May not provide enough power for the more power hungry items. Ask me how I know. Actually don't.
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Old 03-08-2014, 10:19 AM   #30
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Here is a good one @ Amazon Amazon.com: BESTEK usb adapter car cigarette lighter socket car splitter adapter 4 way plug socket usb outlet dc charger power adapter 12V socket 24V dc adapter car charger Ipad Dual USB charger 2.1A MRS152UV: Car Electronics $15 and you have 2 x12v outlets and one Apple USB port and one regular USB port
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Old 03-18-2014, 12:04 AM   #31
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I installed three of these in my camper. They are dual ports so you can charge more than one thing at a time. They do have a small electrical draw when not used. I put mine on switches to turn them off. There is a small red LED which informs you it is powered.

I believe I used a 1 1/8" hole saw and it was a wee bit tight. 1 1/4" might be better. There are two spade males on the back. The more centered one is positive and the one on the edge is negative.

Blue Sea Marine Grade Dual USB Charger Socket 1016 | eBay

These are also available with an adjoining cigarette lighter which would be better for a small inverter to charge a MacBook.
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Old 03-18-2014, 12:12 AM   #32
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Off the subject a little, but something like this could work for the application:
Amazon.com: Coleman 22007 7.5W Folding Panel: Sports & Outdoors
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Old 03-18-2014, 01:34 AM   #33
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My MacBook requires 110 AC to run and charge the battery. Some of the small inverters my not be a good choice. Check with your Apple store for their recommendation for an inverter.
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Old 03-18-2014, 02:44 AM   #34
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Charge my MacBook Air via a cheap 200W inverter in the trailer or in the car. I haven't had any issues.
Could you elaborate why it may not be a good choice?
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Old 03-18-2014, 08:49 AM   #35
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I have used a cheapo inverter to charge my Macbook without any issues.

I suppose these square wave inverters of modified square wave inverters could cause interference. That has not been the case for me.
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Old 03-18-2014, 10:46 PM   #36
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I bought this for my Vaio computer. Amazon.com : Pwr+ Car Charger DC Laptop Adapter Power Cord for Sony Vaio : Laptop Computer Chargers And Adapters : Computers & Accessories
Its just like the AC charger but plugs into 12v. Its worked great in keeping my computer charged as I use it for watching video in addition to the usual computer stuff. I'm sure they must have similar Mac versions. I still have a solar panel though to keep the 12v charged. Haven't had an issue even with my grandkids countless hours of video watching and games.
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Old 03-19-2014, 01:40 AM   #37
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Well from what I see here price seems determine which inverter to buy.
Check out this site on inverters:
HowStuffWorks "Inverter Installation"

In part this is what is posted:

The output of an inverter is a very square wave, not like the smooth, round wave of a perfect sine. Some devices are inherently sensitive to the signal produced by an AC wave. Typically, these are devices that receive or broadcast some kind of signal, such as audio or video equipment, navigation devices or sensitive scientific equipment. You can see or hear the square waveform on a television as lines on the screen or a steady buzz or hum.
Cleaning up the sine wave requires a series of filters, inductors and capacitors. Inexpensive inverters have little or no filtering. The alternating current they produce has a very square wave, which is fine if you just want to make coffee or run something with a simple electric motor. If you need a smoother sine wave, you'll need an inverter with better filtering. Of course, better filtering also costs a little more. Inverters can get extremely expensive, even costing thousands of dollars, that is, if you're looking for an inverter with a smooth sine. The good news: Given a large enough budget, you can purchase an AC power inverter that produces virtually perfect AC sines. In fact, some high-end DC to AC inverters can make sine waves that are even smoother than the AC power supplied to your house.
The final specification to look for is the wave output of the inverter. If you'll be powering any of the equipment that is sensitive to square waves, look for an inverter with a "perfect sine" wave output. Be prepared for sticker shock -- a perfect sine inverter can cost almost 10 times as much as the same wattage inverter with a modified sine output. Modified sine means that the current is run through some filtering, so it isn't a square wave, but it isn't totally smooth either.

This describes the difference in inverters.
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Old 03-19-2014, 01:51 AM   #38
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Quote:
Originally Posted by frankcfx View Post
--
This describes the difference in inverters.
Frank
But, it doesn't explain why I would want to spend 10 times as much on an inverter to charge my Mac, when the cheap unit I have does the job.

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Old 03-19-2014, 02:07 AM   #39
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There is an old saying that you get what you pay for. You pays your money and you takes your chances. Do you actually know what your putting into the Mac Power Supply. Being it is an Apple product the power transformer probably does a good job of cleaning up garbage power put into it. Try plugging a radio, DVD player or small TV into the inverter, does it buzz from dirty AC from the inverter? If not you might have a decent inverter or the equipment is cleaning it up.
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Old 03-19-2014, 09:04 AM   #40
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True sine wave inverters are more efficient ( longer battery life) driving motors. I believe they use about 20% less power. Some applications don't make any difference. No clue whether it matters to chargers.

True sine wave inverters are 2x or 3x the cost of a square wave one. Certainly not 10x.
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Old 03-19-2014, 09:26 AM   #41
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I've been shocked by both pure sine wave inverters and square wave inverters and I gotta tell you, the sine wave inverters feel a lot smoother..... those darn square waves on the less expensive units can really hurt.

That said, I've used both and haven't found a case for the substantial extra cost of the pure sine wave versions.
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Old 03-20-2014, 11:17 AM   #42
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I bought a cheap 1000watt (really two 500 watt inverters in parallel) for $187. I did modify it somewhat, sheet metal instead of plastic side panels for shielding, and nuts and washers instead of thumbscrews. I wanted this for a TV, DVR, and BluRay player, and also for an electric blanket--which are known to have issues with modified square wave inverters.

I have several cheap 300 watt inverters which cost under $20. So it seems the cost for sine wave inverters is about 10 times the amount. I don't think anyone makes a 300 watt pure sine wave inverter. That being said, my inverter has seen daily use for a few weeks now with no issues.
I am wondering how it would hold up, if I started using it for running heavier loads.
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