Power from your automobile's standard plug in

Going on 2 trips soon with 3 passengers. Each of them have movie CD player, so they will want power from the car. I would like power to my GPS also.

Will a 4-way (or three 2-way) power adapters have enough juice to run them? If not, how many can I do at once.

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NUVI40 Kingsport TN

If you try it,

 Make sure you have some extra fuses along. Several years ago, I used a power inverter to plug in a laptop (using it for navigation with Delorme Street Atlas) along with a USB charger for an iPod. It worked fine on our 3000 mile trip, but it did blow the 15 amp fuse a couple of times when the laptop was drawing extra power.
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Alan - Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra

Fuse

 alandb wrote: Make sure you have some extra fuses along. Several years ago, I used a power inverter to plug in a laptop (using it for navigation with Delorme Street Atlas) along with a USB charger for an iPod. It worked fine on our 3000 mile trip, but it did blow the 15 amp fuse a couple of times when the laptop was drawing extra power. A fuse in the inverter, or one of the car's fuses?
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NUVI40 Kingsport TN

My truck

 I have a switched 12v for the lighter and a "hot" 12v receptacle. They each use a 20amp fuse. At home I use a 115 to 12v convertor rated at 1 amp. It powers two GPS devices easily. My old laptop needs 12v 3.68 amps.
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1490LMT 1450LMT 295w

Power

 David King wrote: Going on 2 trips soon with 3 passengers. Each of them have movie CD player, so they will want power from the car. I would like power to my GPS also. Will a 4-way (or three 2-way) power adapters have enough juice to run them? If not, how many can I do at once. Power can be estimated by multiplying the current (amps) by voltage. Assuming a 12v source and a 1/2 amp current draw, that's 6W for your Nuvi. You can figure out the draw for the video players by knowing either the wattage or the amount of current needed. Devices that run off a USB port won't draw more than a 1/2A.
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"Too often we enjoy the comfort of opinion without the discomfort of thought." -- John F. Kennedy, 35th U.S. president

It will be too late

 Box Car wrote: Power can be estimated by multiplying the current (amps) by voltage. Assuming a 12v source and a 1/2 amp current draw, that's 6W for your Nuvi. You can figure out the draw for the video players by knowing either the wattage or the amount of current needed. Devices that run off a USB port won't draw more than a 1/2A. Won't have that info until halfway into the first trip.
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NUVI40 Kingsport TN

If I could do

 all that I would be teaching class in a school.
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3790LMT; 2595LMT; 3590LMT

Me too

 rthibodaux wrote: all that I would be teaching class in a school. Word.
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NUVI40 Kingsport TN

check the fuse

 You can probably get a good idea of the amps available through your accessory outlet by checking the fuse powering it. My Viair 70P air compressor draws 14 amps and works fine from the accessory outlet of my BMW but blew fuses quickly in my son's Mazda. My guess is his outlet is only 10A while the bimmer is 15A. With DC, volts times amps = watts so if you know the watts needed and the amps available it is pretty easy to see if there will be enough power. Jim

10 Amp Fuse Seems Pretty Standard

 I have a Wagan "cup holder" splitter with two 12V outlets and two USB power ports. It has a 10A fuse in the plug. From what I've seen that seems to be pretty standard for splitters that plug into the cigarette lighter socket. Of course, if the DVD players run on battery and only have AC adapters then you'll need an inverter and a power bar. A comment on that: One day I plugged a surge-protected power bar into my 600W inverter and nothing that I plugged in to the power bar would work, but the individual devices would work when I plugged them directly into the inverter. I verified that the power bar worked when plugged into house current. It seems that the surge protector was blocking the non-sinusoidal power from the (inexpensive) inverter. When I switched to a "dumb" power bar everything worked fine.
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TomTom GO 720 (for driving), Samsung Galaxy Nexus (for walking)

Thanks to both of you

 All devices have the standard "cigarette lighter" type of plugin.
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NUVI40 Kingsport TN

Year-Make-Model

 What year make and model of car Dave?

Make

 TheProf wrote: What year make and model of car Dave? 01 Honda Accord Sedan, 6cyl
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NUVI40 Kingsport TN

Car fuse

 David King wrote: A fuse in the inverter, or one of the car's fuses? It was the car fuse for the cig. lighter.
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Alan - Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra

Power From Your Automobile's Standard Plug In

 David King wrote: .....how many can I do at once....." I, too, have had similar concerns over the years. I have a Chevrolet Silverado C10 that has a cigarette lighter and two power ports. Each power port is lsited at 20 amps. I also have a Honda Accord. The power port in front is listed at 10 amps. As far as the various USB devices, it would be a good idea to check it out before you go. I remember taking the family to Branson MO a couple of years back. I brought a Slacker Radio with and connected it with a 12 volt to 5 volt USB power cord. The Slacker Radio stopped playing hours later in Kansas City. I assumed that since it was plugged in it was charging. As it turned out the cord I had only provided 500 milliamps, but the radio needs 1 amp! Just because it has a USB connector doesn't mean the cord will provide enought current to charge a particular device. http://www.scosche.com/consumer-tech/product/2207 Scosche, and others, now have some devices that provide 2.1 amps, or more.

Fuse Info

 Dave, according to page 319 of the 2001 Honda Accord Owner manual the fuse for the Radio/Cigarette lighter is a 20 Amp fuse. It's fuse No. 9 on the Passenger side fuse panel. Remember the amount of current a radio draws is a function of volume, so the louder the radio the more power is required P(Watts)= E(volts) times I(amps). That's about a normal rating for a lighter fuse. Here's the page reference URL. http://techinfo.honda.com/rjanisis/pubs/om/AC0101/AC0101O003...

Thanks

 Thanks Prof!
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NUVI40 Kingsport TN

Tell them...

 David King wrote: Going on 2 trips soon with 3 passengers. Each of them have movie CD player, so they will want power from the car... They should read a book - it's more educational, and you won't have to worry about blowing a fuse!
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The Moose Is Loose! nuvi 760

Yes indeed

 Moose135 wrote: David King wrote: Going on 2 trips soon with 3 passengers. Each of them have movie CD player, so they will want power from the car... They should read a book - it's more educational, and you won't have to worry about blowing a fuse! I WISH!
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NUVI40 Kingsport TN

Minor gotchas, rants, and best wishes--

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2008 Mini Cooper S, Nuvi 2460, 680, DATUM Tymserve 2100, Trimble Thunderbolt, Ham radio, Macintosh, Linux, Windows

Great Write Up

 k6rtm wrote: Those "cigarette lighter" jacks aren't what engineers consider high reliability... They wiggle and bounce, and may not want to keep seated, particularly for long periods of time, bumpy roads, little ones kicking the wires or trying to use them to garotte their siblings. Remember what these outlets were designed for? A simple (resistive) heater. So what if the circuit is broken for a few milliseconds when you hit a bump? That doesn't matter to the heating element, which is off the vast majority of the time, and if it did bounce while it was on a heating cycle, so what? Gotcha #2 -- those brief intermittent circuit openings will usually make devices such as DVD players reset or reboot. Thanks for information on the power outlets. I never thought of that, this may very well be the culprit when people complain of reboots believing it's the GPS at fault.
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Nuvi 660 2460LMT Sold My 765T

.

 muell9k wrote: k6rtm wrote: Gotcha #2 -- those brief intermittent circuit openings will usually make devices such as DVD players reset or reboot. Thanks for information on the power outlets. I never thought of that, this may very well be the culprit when people complain of reboots believing it's the GPS at fault. That would only be true if the GPS had no battery or the battery was completely dead.
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TomTom GO 720 (for driving), Samsung Galaxy Nexus (for walking)

Power

 David King wrote: Going on 2 trips soon with 3 passengers. Each of them have movie CD player, so they will want power from the car. I would like power to my GPS also. Will a 4-way (or three 2-way) power adapters have enough juice to run them? If not, how many can I do at once. Almost every electronic device will list on it's label how much current, in amps, it needs. Add all of the current draws together and you will have the size fuse you will need. Don't worry about watts or any other measurement. Fuses are rated in amps, not watts. Since our society has gotten all 'big brother', all of the latest cigar lighters are de-rated. They no longer need to supply 15 or 20 amps to a heating element so car manufactures have reduced the size of the wire feeding them. This means that they are fused, in some cases, as low as 10 amps. Get your owners manual out and find out what size fuse they used. Remember that there needs to be a fudge factor in fuse size. It really isn't a good idea to try to draw 10 amps through a 10 amp fuse. You need at least a 50% fudge on fuse size. If your load is 10 amps then your fuse size should be 15 amps.

Don't increase the fuse size.

 If the power adapter has a 10 amp fuse on it, and you are running 10 amps, DO NOT increase the fuse size. The fuse rating is there due to wire size as jackj180 mentioned. Increasing the fuse and running maximum amps will cause the wire to heat up. It will possibly melt and cause a fire. Do you remember the "I didn't have a fuse so I stuck a penny (tin foil) in the holder"?
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Nuvi 2460LMT and 1350.

Trip completed

 Trip was better than I expected. Girl did not have a device that needed power. Read a book the entire trip! Wife forgot headphone to her DVD player so decided not to use it. Only grandson and I needed power. Thanks to everyone for their teaching.
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NUVI40 Kingsport TN

Good info in this thread.

 Good info in this thread.