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VK5IE > TECHI 08.08.04 22:35l 61 Lines 2338 Bytes #999 (0) @ WW
BID : VK5IE12613
Read: GUEST OE7FMI
Subj: Re: Charging car batteries.
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<ZL2BAU<VK7AX<VK3AVE<VK5UJ<VK5BRC<
VK5SPG
Sent: 040808/2101Z @:VK5SPG.#ADL.#SA.AUS.OC #:6603 [Adelaide] $:VK5IE12613
From: VK5IE@VK5SPG.#ADL.#SA.AUS.OC
To : TECHI@WW
[¯¯¯ TST HOST 1.43c, UTC diff:0, Local time: Mon Aug 09 05:50:13 2004 ®®®]
Hi,
Said Dick VK3ABK and Terry VK5ATN:
>> But! The 'Silicon Chip' people replied to the reader, saying, " We know >
of no reason why you
>should have to disconnect your car's battery when > you connect a
>mains-powered charger." No if's or but's there!
>>
>> Who, or what, is correct in this controversial question?
>>
>> 73. Dick. VK3ABK.
>>
>
>It's a good question Dick. I haven't got the answer.
I don't have an answer either but considering that cars use 13.6 volts and
mains chargers 240 volts, if anything went wrong, there be a sizzle of some
sort.
>I will muddy the water however by throwing in two other controversial
>points which are related:
>
>1) Anecdotal stories about people destroying their alternator circuitry by
>not disconnecting the battery when doing any welding on the vehicle.
As a boilermaker/welder (retired) it was always drummed into us at Tech
School never to weld on cars etc with battery leads connected.
Can't remember why now (lot of water under bridge in 50 odd years) but
considering the size of cables on a welding machine (minimum 1/2 inch on
commercial welders) and the size of wiring on a car/truck etc and the
amount of current a welding machine puts out than it is fair to say that
leave the leads on and a component sizzle will happen.
In short, the components and wiring can't handle the current produced by
a welding machine.
Even on commercial cranes, mobile or fixed, always slip a leather glove or
some sort of insulation over the hook if it is holding up the job in hand
before welding start, again electronincs would not be able to handle
current.
>2) Much confusion about the "correct" way of boost starting a modern car
>using jumper leads.
IMHO, connect jumpers to assist car then car in trouble, start up assist car
and then car in trouble, always worked for me.
>I have my theories, but I'm going to wait for the (other) experts to say
>something first ;-)
No expert here either :-).
Hope I haven't muddied the waters to much.
73' de BILL - VK5IE @ VK5SPG
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