On Tuesday, 9 May 2017 14:24:02 UTC+1, David WE Roberts (Google) wrote:
On Tue, 09 May 2017 09:53:30 +0100, Harry Bloomfield wrote:
on 09/05/2017, Brian Gaff supposed :
The lighter is not going to sink the sort of current you need to charge
it really, and yes you could current limit this by a simple circuit
(Look in many of them old Bibani Books!)

It may not charge at full speed, but charge it would.

I'm sure little modules exist for this nowadays.

No need, the resistance of the wiring and the small voltage difference
between vehicle battery and car battery will provide an effective limit
to the charge current.

I would no want a battery on charge in the passenger compartment.

Our Touareg has the battery under the passenger front seat.

Our Hymer motor home had the leisure battery under the driver's seat.

Our caravan has the battery under a seat in the lounge area.

All of them are charged whilst people are around.

I fail to see the problem, frankly.

Cheers



Dave R

Charging regulation failed in one of my history pieces. The first I knew of it was when the interior suddenly filled with choking sulphuric acid fumes.. In the space of under a second I couldn't breathe at all. I clamped anchors and leapt out. It had no effective bulkhead. Maybe if it had had fusing (it had none anywhere) that could have prevented it. If it had had an ammeter I might have noticed something wrong.

Modern vehicles are different of course. Interior batteries will either be boxed & vented to the outside, or monitored in various ways to detect any malfunction & shut down - I presume.


NT