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Old 02-24-2012, 11:58 PM   #11
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Re: 12v inverter recommendations?

Found this for iPad:

Built-in 25-watt-hour rechargeable lithium-polymer battery

I gather that means it uses 25 watts.

Hopefully one of our electrical wiz's will chime in.

baglo
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Old 02-25-2012, 09:14 AM   #12
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Re: 12v inverter recommendations?

I looked in System info for my MacBook Pro 15 and it also lists the power supply as 85 watts, but I think that is the maximum output wattage rating of it. I have "Kill A Watt" meter and as I type this (with the battery not fully charged) it shows a draw of about 31 watts. I imagine that that varies as the battery is at different points in the charge cycle. I doubt that it ever gets too close to that 85 w maximum. When I slept the computer and only the battery was charging, it was only drawing about 10w. So it looks like a big difference if you only want to be able to charge the battery vs running the computer off the external power supply.

But now you have my interest peaked so I will test it at different charges and see what I get. (edit) - I let the battery drain mostly down, and at a deeper discharge is was drawing about 40 watts to charge. With trying different things, starting programs etc, I was able to get it to a maximum of 82 w draw.(end edit)

The inverter I have was pretty inexpensive Tripp-Lite (only 150W) and it has been fine for all we use it for - charging iPad, MacBook, AA batteries and cell phones. If I were buying a new one I think I would get this one: http://www.amazon.com/Tripp-Lite-PV3...m_cr_pr_sims_t - not so much for more power, but to get 2 outlets and Tripp-Lite has been a reliable brand for me.

Eric

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Old 02-25-2012, 11:51 AM   #13
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Re: 12v inverter recommendations?

I just got lucky and won a Sparq charging station from Zagg.. It's a offline battery pack that allows 2 USB devices to charge (at the same time).. Not too sure if you'll find a interest in it, but what the heck it was free!! Good for phones and iPads type devices..

http://www.zagg.com/accessories/zaggsparq.php
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Old 02-25-2012, 12:49 PM   #14
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Re: 12v inverter recommendations?

I forgot the mention that these are REALLY handy devices: http://www.amazon.com/Griffin-GC2313...0191095&sr=8-1

They put out enough power to charge any small devices like cell phones, iPods and even an iPad's current needs - (but probably not enough to charge most laptops) that charge via a USB cable. The advantage inside the Escape is that you are already dealing with 12v DC power so this device just puts out the correct DC voltage for USB cable charging. An inverter has to start with 12V DC power, turns that into 120V AC, then you plug in a charger that reconverts it to DC, with an efficiency loss at each step, meaning more drain in the Escape's batteries. Also you can use this inside your tow vehicle while you are drive to recharge devices with no drain on the Escape's battery.

Eric
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Old 02-25-2012, 02:13 PM   #15
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Re: 12v inverter recommendations?

While I have both a 1000 watt sine wave & 250 watt modified sine wave inverter, I also have individual 12V to what ever power supplies for my Sony iPhone Dock, my laptop, and by camera battery chargers. As Eric stated, it is more efficient to go directly rather than convert up to & down from 120V, plus some camera battery chargers (and other devices) do not work well with modified sine wave inverters.
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Old 02-25-2012, 02:39 PM   #16
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Re: 12v inverter recommendations?

Wow, as usual, you all go above and beyond the call. This board is the best.

Eric, your "gadget" seems like the perfect fix, and I appreciate the specific inverter recommendation. Funny, one of my college summer jobs was working for a company that handled Tripp lite's press ... you can only imagine the thrill

Everyone else who chimed in ... Thanks to you as well. Useful AND educational!
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Old 03-03-2012, 04:25 PM   #17
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Re: 12v inverter recommendations?

Quote:
Originally Posted by gbaglo
Found this for iPad:

Built-in 25-watt-hour rechargeable lithium-polymer battery

I gather that means it uses 25 watts.

Hopefully one of our electrical wiz's will chime in.

baglo
That means it will theoretically provide 1 watt for 25 hours, 25 watts for one or or a combination thereof. Of course, the actual power delivered will be a lot less due to internal resistance, etc.
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Old 03-03-2012, 04:34 PM   #18
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Re: 12v inverter recommendations?

When we are dry camping I bring along a big deep-cycle battery to power a 400 w inverter. It charges all of our little electronic gizmos and will run our TV if we want to watch a movie. When we go out for a drive, it rides in the bed of the truck and recharges from the 7-pin connector there.

Dave
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Old 03-03-2012, 09:57 PM   #19
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Re: 12v inverter recommendations?

Now that's a excellent idea. If the battery is in a carrying case with handles it's totally portable.
I think a spare 7 pin plug in and 2 gator clips is the set up.?
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Old 03-03-2012, 10:12 PM   #20
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Re: 12v inverter recommendations?

That's the ticket. I strap the battery box to the 5th wheel hitch so there's no worry about it shifting during the drive.
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