Any - Solar Battery Chargers - RaineMan

Some years ago I used a (modified for positive earth) solar car battery charger on a sixties’ classic. This connected to the cigar lighter that was on a fused circuit. I am now thinking of using one on a “future” classic as the alarm, etc. drain the battery when standing. However the lighter circuit is only live when the ignition is turned on (not a sensible option). I was wondering what the best way to wire the charger in was on a more modern car with ECU, etc?

Any - Solar Battery Chargers - RT

Get a pair of Tamiya R/C model connectors, Maplins or hobby shops - connecting one end to the car battery through a fuse and the other end to an inline lighter socket.

Or - fit an extra lighter socket wired to the car battery through a fuse.

Any - Solar Battery Chargers - liammcl

I woulld guess, it would have to be another cigarette lighter which is "live" all the time.

A fused wire fed thru a grommit,
then you could leave the solar charger in the car.
they are quite easily bought from fleabay etc

or.. you could, if it's somewhere out of the sun,
have a spare battery, inside the car
and connect that to slowly charge the original in situ.

when I was running an 12v to 240v invertor,
to power a laptop and 2 printers in the boot of my car.
(which were printing flyers , while I was at a customers,
I split the 12v cigarette output to power 2 batteries.
ie the original battery under the hood, and another battery in the footwell .
(or the boot etc)
I know there is a slight risk of hydrogen gas... maybe someone who knows better can comment
but I never had any problems, doing this daily for months on end.

Are you away from the car?
as you can also get an alarm, that tells you if the car battery is low
which would prompt you to swap it over, or recharge it.

or , every couple of months bring a fully charged one along and swap it over... the duration depending on the parasitic drain.


Any - Solar Battery Chargers - liammcl

I got these from ebay, but the quality wasn't good.
I've had to resolder them.
but these were the cheapest I could get £2

and this connected to a spare fully charged battery in the foot well, and feeding back to the main battery.

It'll take twice as long to discharge, as one battery.



Value my car