24v Input Query

Darren · Posted: Tue Jul 06, 2004 5:10 pm Post subject: 24v Input Query

In answer to a post on a Usenet forum I suggested that it may not be advisable to plug a GPS Mouse with cigarette lighter power plug into a 24 supply.

I've since been told that these adapters will happily accept input from 8v - 35v. Can any HGV drivers with 24v confirm this? I'm being cautious until I know better as if this is incorrect it would possibley mean 1 fried PPC and GPS! I thought the accessory outlets sold 24v - 12v converters specifically because of this but maybe the converters that come with GPS are just better designed to handle this range of inputs?
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Darren Griffin

alix776 · Posted: Wed Jul 07, 2004 12:33 pm Post subject:

ive seen this around on the brodit site they say there mounts a 24v-12 compatablebut wouldnt like to try it the general rule of thumb is if your not sure use and voltage dropper and can be picked up for as little as £25 pound. personally i wouldnt try itunless id spoken to the manufacurer
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currently using aponia truck navigation on windows phone. Good bye IOS don't let the door hit you on the way out .

Oh the joys of being a courier.
device Lumia 950 xl

mikeshe · Posted: Sun Jul 11, 2004 4:45 pm Post subject:

Darren

I have actually used mine in a truck using the TomTom Car Kit, plugged into the 24 volt lighter socket and everything was okay.

Mike

Darren · Posted: Sun Jul 11, 2004 9:07 pm Post subject:

Cheers, looks like it's OK then Thumbs Up

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Darren Griffin

Gowjo · Occasional Visitor Joined: Jul 18, 2004 Posts: 4

In most trucks today you will find a switch on the dash that says 12/24 this enables to switch between 12 or 24 volt, i use my ipaq 2210 with tomtom 3 on the 12v and not a problem at all, it works fine, ive even switched it to 24 to test it, because the ciggy adaptor is fused there is no worry of damaging the system. hope this helps.

quadman · Posted: Mon Feb 07, 2005 7:06 pm Post subject: cigarette lighter

I have always plugged my electronic devices into the cigarette lighter, basically your charger is a step down transformer. If you plug the charger in first without plugging into the device, you would see smoke from the charger.

I have never had a problem, you could get a voltage dropper or an adaptor for the 12 volt socket if you'd prefer.

That is if the lighter socket works though.......

Skippy · Posted: Mon Feb 07, 2005 8:15 pm Post subject:

Dohnut · Occasional Visitor Joined: Jun 04, 2004 Posts: 10

Word of advice and also a word of warning.

I had the same reservations about whether to plug into the 24v supply, so I obtained a 24/12v dropper which I keep with me at all times, works well, the Emtac charger, chargers both the Ipac 4150 Pda and the Emtac bluetooth Gps.

However one day I inadvertently plugged the charger directly into the 24v system on the truck, after about half an hour I realised what I had done. Oh joy of joy, no problem both the Pda and the Gps worked fine and still do, however I am still cautious and use the dropper, when I can be bothered to get it out.

Now for the caution, two days ago I plugged the charger in as usual to find that it was not working, no light on, so I got my backup charger out a Leadtek charger which clearly stated 12/24v on it. Two seconds later I smelt the distinctive smell of frying electronics, I quickly pulled the charger out. Too late the charger was well and truly cooked. Worse still it was in the 12v socket not the 24v. The only conclusion I could come with was that the on board dropper was connected the wrong way and was giving out 48volts and not 12v. Moral of this story is that I will always use the 24v plug, no dropper to screw it up.

What concerned me the most was that the fuse in the Leadtek charger had`nt blown. Bit of good luck though when I had a chance to check the fuse in the Emtac charger, it had blown, soon had the spare fuse in it and on and on and on.

Ipac 4150, Emtac Bluetooth Gps,
Backup Gps, Leadtek 9537

Gus607 · Posted: Sat Mar 12, 2005 9:38 am Post subject:

I have used my TTG since last August plugged into a 24v cigar lighter socket on a truck, no problem. If the charger is rated 12/24v then all should be ok.

oddsock · Posted: Sat Mar 12, 2005 10:11 am Post subject:

If anyone is worried about frying their precious bit of kit all that is required is to measure the voltage at the jack end of the power lead and if it matches the specs of the kit you are useing ( +ve or -ve pin and the correct voltage) then you should be OK Exclamation

Every one does have a meter don't they Question

Dave

robertn · Frequent Visitor Joined: Feb 06, 2005 Posts: 564

There are a number of issues around putting 24V into a device designed for 12V. Components are rated for a specific voltage, sometimes they go pop immediately, sometimes they last longer. Most 12V devices will handle well over 12 Volt, but will be on or exceeding limits at 24V. Because it appears to work doesn't mean you are not damaging it. Also dropping 24Volts down to 12 can generate a lot of heat. It may take an hour of more to finally "let the smoke out".

Unless you know what you are doing, don't exceed the manufacturer spec. Also don't plug a 24V device into 12 volts. Nasty things can happen as well.

Remember that a 24V system is a nominal 24 Volt. They normally run at around 28 volts. It's not uncommon to see 30+V "spikes" in this environment. Unless a device is designed for 24V automotive, it's luck that keeps the smoke inside the components.

Gus607 · Posted: Mon Mar 14, 2005 7:23 pm Post subject:

Well, the sticker on my TTG charger states 24/12v input. But did I read somewhere that some TTGs shipped with a 12v charger only ?????????
If only 12v then don't connect to 24v.

Oldboy · Posted: Mon Mar 14, 2005 8:38 pm Post subject:

Skippy · Posted: Mon Mar 14, 2005 10:38 pm Post subject:

Oldboy · Posted: Tue Mar 15, 2005 7:14 am Post subject:

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