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Batteries


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  #1 (permalink)  
Old January 11th 04, 04:29 PM posted to uk.rec.motorcaravans
AndyP[_2_]
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Posts: 25
Default Batteries

My girlfriend has an Autosleepers Trident VW Diesel (2.3?). The starter
battery was flat the other day. Could we have put jump leads from the
leisure battery which is adjacent to it in the engine bay to start it? I've
discovered differing opinions on this. Also would a battery from a small
petrol engine car (she also has a VW Polo 1.4) be capable of giving enough
current to start it with jump leads? They should both have CCA ratings on
them shouldn't they? How much difference does there have to be between
these before it's just not going to work?

Hope someone here can offer some info.


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  #2 (permalink)  
Old January 11th 04, 06:07 PM posted to uk.rec.motorcaravans
Hoot!!![_2_]
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Posts: 15
Default Batteries

Dont use leisure battery (you can short things out)
A polo battery is ok to jump start as long as the polo's engine is running

"AndyP" wrote in message
...
My girlfriend has an Autosleepers Trident VW Diesel (2.3?). The starter
battery was flat the other day. Could we have put jump leads from the
leisure battery which is adjacent to it in the engine bay to start it?

I've
discovered differing opinions on this. Also would a battery from a small
petrol engine car (she also has a VW Polo 1.4) be capable of giving enough
current to start it with jump leads? They should both have CCA ratings on
them shouldn't they? How much difference does there have to be between
these before it's just not going to work?

Hope someone here can offer some info.




  #3 (permalink)  
Old January 11th 04, 06:24 PM posted to uk.rec.motorcaravans
SH[_2_]
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Posts: 25
Default Batteries

Comments below:-

"AndyP" wrote in message
...
My girlfriend has an Autosleepers Trident VW Diesel (2.3?). The starter
battery was flat the other day. Could we have put jump leads from the
leisure battery which is adjacent to it in the engine bay to start it?

I've
discovered differing opinions on this.


So have I but personally I would risk it - anyway, it is often the case that
the original leisure battery has been replaced wit a normal vehicle one.

Also would a battery from a small
petrol engine car (she also has a VW Polo 1.4) be capable of giving enough
current to start it with jump leads?


If you connect the batteries up (CAREFULLY) in the first place and start the
Polo, turn the Autosleeper over with somebody in the Polo reving the engine
to at least at 2000rpm. At least this way it will ensure that the battery is
being replenished by the alternator & and you don't end up with 2 dead
batteries.

Good luck.









They should both have CCA ratings on
them shouldn't they? How much difference does there have to be between
these before it's just not going to work?

Hope someone here can offer some info.




  #4 (permalink)  
Old January 11th 04, 09:03 PM posted to uk.rec.motorcaravans
AndyP[_2_]
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Posts: 25
Default Batteries

Thanks


  #5 (permalink)  
Old January 13th 04, 04:07 AM posted to uk.rec.motorcaravans
Bill[_6_]
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Posts: 2
Default Batteries

I don't contribute unless incensed. If you run the Polo engine as you attempt
to start the motorhome you are likely to damage the alternator on the Polo.
Switching transients may damage the diodes.
You can't charge a flat vehicle battery from a charged leisure battery. The
terminal voltages are different. The amount of charge transferred would be
minimal.

Bill
  #7 (permalink)  
Old January 13th 04, 08:50 PM posted to uk.rec.motorcaravans
CampinGazz
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Posts: 339
Default Batteries


"Bill" wrote in message
...
I don't contribute unless incensed. If you run the Polo engine as you

attempt
to start the motorhome you are likely to damage the alternator on the

Polo.
Switching transients may damage the diodes.


LOL, ok, the polo has what, a 55 amp alternator on it??
what size alternator is on the van?? have a look, it could be 45 amps, 55
amps, or 90 amps, dont matter really, as thats the max output it can put
out, if you need anymore then the battery takes care of that,
call the RAC out, they may well turn up in a little van.. used to be ford
escorts, prolly a renault kangoo nowadays tho, ask him what size alternator
he has.. prolly a 55 amp one,
poeple seem to think rac vans have millions of battereis in them just to do
jump starts.. guess what.. they ahve one battery to jump start you with..
and it's the same bugger that is charging their starter battery, the one
they started their engine on that morning.

when i worked for the RAC we had a fiesta van kitted out as a breakdown van,
it was used to get into multi storey car parks to jump start cars.. as the
other vans were usually merc 609's and thus too high to get in the car
parks,
that thing had it's stock 45 amp alternator on it, and the stock 60 AH
battery on it,
i personaly used it to jump start about 50 cars in my time there.. ranging
from grannies suzuki swift cars, to farmers old rangerovers with the 3.5
litre engines in em,
always starter them if it was just a flat battery from leaving the lights
on, or the battery dying,

you do know how to jump start a car?? you dont just connect the leads, and
imediately turn the disabled cars engine over like most do,
you connect the leads.. engine running in the slave car, wait about 4
minutes, then start the disabled car, this gets some charge back into the
other cars battery to enable it to be re-started later on if needed, and it
also reduces the strain on the slave cars battery when you are trying to run
a starter while the dead battery is pulling the system voltage down.

You can't charge a flat vehicle battery from a charged leisure battery.

The
terminal voltages are different. The amount of charge transferred would be
minimal.


But who would want to charge a battery from another one,
you CAN jump start using the leisure battery, done it a few times my self,
jsut connect it up like it was a normal battery, and away you go,

just dont do it too often as you'll warp the plates in the leisure battery
and shed most of the lead sulphate sponge off them when a high current is
drawn from a leisure battery.. that's why they are different.

in the van i'm building i've got twin alternators, so i have a totaly
seperate leisure battery system to the starter battery (doing this for a
variety of my own reasons, one of them is the 330AH of leisure battery, and
only 90AH of starter battery.. alternators have similar outputs)
but i'm running a 400 amp welding cable from the leisure batteries to the
engine bay, and connecting the end of that cable to a large solenoid, the
leisure battery charging altarnator's output goes to the cable on the same
terminal of the solenoid,
the other terminal on the solenoid goes to the starter battery,
a switch in the cab powers the solenoid, so if i ever have a flat starter
battery, all i have to do is press the switch in the cab, and the leisure
battereis are connected tothe starter battery, and i can start the engine.

this isn't a new idea BTW, americans have been doing it for years, most
large RV's over there come with this system fitted from the factory.. it's
called an 'emergancy start'

it just saves faffing about with jump leads on the odd occasion you leave
the lights on, or parasitic loads have killed the battery due to the van
being left unused for a few weeks.


 


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