Trickle charge via cigarette lighter plug?





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  1. #1
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    Default Trickle charge via cigarette lighter plug?

    Simple question.

    Can I attach a (smart) trickle charger to a cigarette lighter socket?
    The socket is "always on".
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    Default Re: Trickle charge via cigarette lighter plug?

    On a modern car? With ecu’s in the mix? Personally I wouldn’t
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    Default Re: Trickle charge via cigarette lighter plug?

    No, connect the charger directly on to the battery terminals.


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    Default Re: Trickle charge via cigarette lighter plug?

    If that charger is not going to draw more than 15A, why not.

    If it is an intelligent charger, just make sure it cut out before your crank battery is to low. Else add some kind of protection device.
    Last edited by Henris; 2020/04/10 at 08:23 AM.
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    Default Re: Trickle charge via cigarette lighter plug?

    Quote Originally Posted by 4eTouareg View Post
    Simple question.

    Can I attach a (smart) trickle charger to a cigarette lighter socket?
    The socket is "always on".
    It will work but take into consideration volt drop in wires ie resistance if the battery is very discharged. Secondly, if you going to leave your car door open to charge via ciggy lighter due to wires, then you might as well pop the bonnet and charge direct onto battery.
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  7. #6
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    Default Re: Trickle charge via cigarette lighter plug?

    Are you trying to charge the car battery through the lighter, or charging a second battery from the lighter?









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    Default Re: Trickle charge via cigarette lighter plug?

    Quote Originally Posted by Peter Connan View Post
    Are you trying to charge the car battery through the lighter, or charging a second battery from the lighter?
    The first.
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    Default Re: Trickle charge via cigarette lighter plug?

    Check out the latest Harry's Garage on YouTube, he deals with this.

    Short answer is, he does.

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    Default Re: Trickle charge via cigarette lighter plug?

    If in doubt leave it out!

    I have a B/H plug that chargers my caravan battery while driving. Simply plug the charger in there with a B/H plug - Wife brags that we now have a hybrid!
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    Default Re: Trickle charge via cigarette lighter plug?

    Quote Originally Posted by 4eTouareg View Post
    Simple question.

    Can I attach a (smart) trickle charger to a cigarette lighter socket?
    The socket is "always on".
    I'd connect it to the battery, using an inline-fuse perhaps (always safer).

    A trickle charger may still follow the 8-step process and current may spike, blowing your cigarette lighter fuse. Most cigarette fuses are 10A if I recall.
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    Default Re: Trickle charge via cigarette lighter plug?

    If the battery was charged prior to the application of the trickle charger then the thin wires should not be a problem.

    Trickle charging has very low currents so there should not be significant voltage drops. There should not be current spikes, especially not north of 2 Amps if the trickle charger is just floating the battery and there are no significant loads connected to the battery.

    Just do not start the engine with the charger connected as the charger would like to "contribute" to the dropping battery voltage due to the high current draws. This is probably the only high current scenario I can think off from personal experience.....Midas battery chargers eats fuses when you attempt to force it to "contribute" amps or jump start a flat bat Hilux !

    In general most trickle chargers, designed for "trickling" and not full blown charging normally also have a fairly low amp rating in any case ( Ja, ja I have seen those fancy high amp C-Teks ! )

    If the system is fused at the charger supply side I don't see the problem.

    With the charger connected measure the voltage on the battery. I would expect it to float in the 13.8 V range on a lead acid battery

    Maybe not an issue, but the 220V power supply will have to get into the car somehow. Just check for pinching at the door seal
    Last edited by vlakkie; 2020/04/08 at 10:59 PM.
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    Default Re: Trickle charge via cigarette lighter plug?

    My concern is that for the lighter socket to be connected to the battery, the ignition has to be partially on.

    I wouldn't.
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    Default Re: Trickle charge via cigarette lighter plug?

    Quote Originally Posted by Peter Connan View Post
    My concern is that for the lighter socket to be connected to the battery, the ignition has to be partially on.

    I wouldn't.
    Some vehicles, as with the OP, has an ‘always on’ socket. It is powered even of the ignition is turned off.

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    Default Re: Trickle charge via cigarette lighter plug?

    Ah, missed that. Thanks.
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    Default Re: Trickle charge via cigarette lighter plug?

    Quote Originally Posted by SAND View Post
    Some vehicles, as with the OP, has an ‘always on’ socket. It is powered even of the ignition is turned off.
    Even outside of lockdown, the Fortuner does about 6k clicks a year. It's our holiday/long weekend vehicle. It seems to have an inactive tracking unit somewhere, draining the battery over time. So far we've not been able to find it.

    I asked an auto-electrician to modify the one ciggie port for this type of charging, including proper wire and fuse and always-on. So the Ctek is plugged in permanently.

    Much less hassle than fiddling with the bonnet as the car stands nose to the garage wall.
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  20. #16
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    Default Re: Trickle charge via cigarette lighter plug?

    Quote Originally Posted by 4eTouareg View Post
    The first.
    Originally Posted by Peter Connan
    Are you trying to charge the car battery through the lighter, or charging a second battery from the lighter?

    Am I reading this right?
    You want to charge the car battery from the cigarette lighter socket which is powered from the car battery??

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    Default Re: Trickle charge via cigarette lighter plug?

    Quote Originally Posted by Lxv View Post
    Originally Posted by Peter Connan
    Are you trying to charge the car battery through the lighter, or charging a second battery from the lighter?

    Am I reading this right?
    You want to charge the car battery from the cigarette lighter socket which is powered from the car battery??
    Perpetual motion is possible, so why not closec loop charging?

    No, the charger is 220V smart charger.
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  23. #18
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    Default Re: Trickle charge via cigarette lighter plug?

    Somebody stole 4e's identity.

    Either that or the old man has gone mad.

    Maybe it's lock down sickness.
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    Default Re: Trickle charge via cigarette lighter plug?

    Self edit.
    I understand now. You want to 'reverse' the power into the system like plugging a genny into a wall socket.
    Last edited by bones; 2020/04/11 at 08:27 AM.
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    Default Re: Trickle charge via cigarette lighter plug?

    Quote Originally Posted by 4eTouareg View Post
    Perpetual motion is possible, so why not closec loop charging?

    No, the charger is 220V smart charger.


    Sorry, but this is very confusing - this is your original post:

    Simple question.

    Can I attach a (smart) trickle charger to a cigarette lighter socket?
    The socket is "always on".

    Are you asking if you can plug a 220v smart charger into a 12v cigarette lighter socket?
    Or is there maybe an inverter in this perpetual motion loop charging machine?

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