cloudy
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| posted on 20/2/08 at 06:44 PM |
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BEC Battery (Capacity vs Weight)
I've got two bike batteries in mind for the BEC -
Odyssey PC545 14Ah 5.3kg
Odyssey PC310 8Ah 2.7kg
Any suggestions on whether I should sacrifice 2 and a bit kilos for the extra capacity? (The original bike used 10Ah)
Any other batteries I can look at? Weight is my primary concern, ie the smallest battery I can get away with without risking a non starter when out on
a trip
James
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Dangle_kt
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| posted on 20/2/08 at 07:06 PM |
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You thinking of using a optimate?
quote:
Originally posted by cloudy
I've got two bike batteries in mind for the BEC -
Odyssey PC545 14Ah 5.3kg
Odyssey PC310 8Ah 2.7kg
Any suggestions on whether I should sacrifice 2 and a bit kilos for the extra capacity? (The original bike used 10Ah)
Any other batteries I can look at? Weight is my primary concern, ie the smallest battery I can get away with without risking a non starter when out on
a trip
James
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tks
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| posted on 20/2/08 at 07:43 PM |
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The 8AH can do the job...
in the end its the dynamo/rectifier wich supplies you the power and not the battery.
If you would be using the battery then you would runout of power....
sow 8AH is enough cranking power to toggle on your BEC...
saying that it won't let you crank as many times as a 10ah or an 14ah but to crank ones and then use it should be no problem..
especially if you use it for longer trips.. 15min...
Tks
The above comments are always meant to be from the above persons perspective.
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iank
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| posted on 20/2/08 at 08:00 PM |
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Full specs
PC 310 Specs:
* 310 cranking amps for 5 seconds
* 250 cranking amps for 10 seconds
* 225 cranking amps for 20 seconds
* 200 cranking amps for 30 seconds
* 8 Ah
* Short circuit current over 455A
* 9 minute reserve capacity with 25amp load
* CCA - 100 (Is this important?)
* Length 5.43"
* Width 3.39"
* Height 3.98"
* Weighs 5.9 lbs
PC 545 Specs:
* 545 cranking amps for 5 seconds
* 495 cranking amps for 10 seconds
* 420 cranking amps for 20 seconds
* Short circuit current over 1200A
* 18 minute reserve capacity with 25amp load
* Female brass terminal w/M6 SS bolt
* Length 6 7/8"
* Width 3 1/4"
* Height 5 1/8"
* Weight 11.7 lbs
So it depends purely on the cranking amps required by the starter. The capacity does come into it somewhat as that gets eaten into by the start, so
on a trip of multiple short journeys it may not get back to fully charged.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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BenB
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| posted on 20/2/08 at 08:31 PM |
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It's all to do with the cranking capability. The capacity overall isn't that important unless you want to be able to switch the engine off
and leave auxillaries running... Otherwise as already said (I'm sure we've had this conversation recently) the regulator and alternator
are what control whether there'll be enough juice for running the car when the engine is running...
If you stick with the original bike battery you should be fine. If you go for too small a battery you might find the cranking capacity is too small to
turn over the relatively high compression bike engine....
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cloudy
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| posted on 20/2/08 at 08:34 PM |
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I'm testing with a battery capable of cranking 300 amps so either is fine. All these types of batteries should hold a good charge for months on
end - the battery will be isolated when the car is in the garage ( no power )
Anyone using sub 10Ah able to comment on what they'd recommend?
James
[Edited on 20/2/08 by cloudy]
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