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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-09-2012, 02:38 PM   #11 (permalink)
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would something like this work then?

http://www.ebay.com/itm/Brand-New-Po...item4d02b64f52
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Old 11-09-2012, 02:58 PM   #12 (permalink)
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No, it won't be able to provide the huge peak currents necessary for engine starting (60-80 amps), just look at the size of its output cables.

Are you confusing Lithium-Ion with the Lithium-Iron-phosphate batteries?
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Old 11-09-2012, 03:10 PM   #13 (permalink)
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Quote:
Originally Posted by Forchetto View Post
Not really into HID mods ...

Decosse is probably our man.
HIDs not my thing either - I prefer to optimize the incandescents with
a) Improved wiring with relays to avoid voltage drop to the lamp
b) more efficient bulb of standard wattage
c) improved lens/reflector.

Back to the original problem - battery simply not sufficiently charged adequately to provide the 5A required for the light bulb, even if only for a few minutes.
The LED draws minimal current which is why that test is irrelevant

Quote:
Originally Posted by Ripper
Your battery only provides 4.8 Amps for one hour. However this would not prevent the bulb from lighting up since the battery should be able to provide 9.6 Amps for 30 minutes but because this is outside the battery's recommended rating there is a risk of damage to the battery.
A reasonable generality for the illustration at hand - however 4.8Ah rating does not really mean the battery will supply 4.8A for one hour - nor will it supply 9.6A for 30 mins.
The way Ah rating is calculated is from the maximum current the battery is capable of constantly supplying over a period of 20 hrs before it depletes to 80% depth of discharge; for a 4.8Ah battery that means it would sustain 240mA for 20 hrs.
The math however is not linear and there is a significant difference from supplying 5A vs 240mA - so although it sounds like a simple ratio, in the real World, you would never get anywhere close to one hour at 5A load.

That being said however, a 5A load should easily be able to be sustained by a 4.8Ah battery for at least a reasonable period of time: if it does not even light, then the battery is sagging excessively suggesting it has insufficient charge state.
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Old 11-10-2012, 09:23 AM   #14 (permalink)
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thanks for the great lesson. I get it now. It looks like those bulbs need a lot more power. Oh well, it was a nice idea. Now I have to figure out what to do with all of these extra bulbs and HID kits that I found in the garage!
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Old 11-10-2012, 12:39 PM   #15 (permalink)
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Quote:
Originally Posted by DEcosse View Post
HIDs not my thing either - I prefer to optimize the incandescents with
a) Improved wiring with relays to avoid voltage drop to the lamp
b) more efficient bulb of standard wattage
c) improved lens/reflector.
+1, especially with the improved lens/reflector

Quote:
however 4.8Ah rating does not really mean the battery will supply 4.8A for one hour - nor will it supply 9.6A for 30 mins.
The way Ah rating is calculated is from the maximum current the battery is capable of constantly supplying over a period of 20 hrs before it depletes to 80% depth of discharge; for a 4.8Ah battery that means it would sustain 240mA for 20 hrs.
Which is - 240mA x 20hrs = 4800mA or 4.8A or, to put it another way, 4.8A for 1 hour. I agree that these ratings have no real bearing on a battery's performance in the real world though. But for the sake of simplicity I guess, the ratings are calculated on a linear scale, ie. double the current being drawn and you halve the time over which it can be drawn.
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Old 11-10-2012, 12:45 PM   #16 (permalink)
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Originally Posted by fernandos1 View Post
thanks for the great lesson. I get it now. It looks like those bulbs need a lot more power. Oh well, it was a nice idea. Now I have to figure out what to do with all of these extra bulbs and HID kits that I found in the garage!
If you really want to build a super torch, look at using Cree LEDs rather than a headlamp bulb. In terms of the light emitted a single Cree LED with a good reflector arrangement would easily compete with the low beam of an H4 bulb and you could afford to run quite a few Cree LEDs from your 4.8Ah battery.
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Old 11-10-2012, 01:03 PM   #17 (permalink)
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Quote:
Originally Posted by Ripper View Post
But for the sake of simplicity I guess, the ratings are calculated on a linear scale, ie. double the current being drawn and you halve the time over which it can be drawn.
That was exactly my point that they are NOT 'calculated' on linear scale but calculated specifically at the 20 hr rate and are absolutely not linear when larger currents are loaded
So you really can't simply double the current half the time, especially when you go to even larger multiples, in this case 20 times the 20 hr current rating
The Ah number is a relative guide that can be used as comparison between batteries, not to be used as an absolute given life at any other load

The LEDs are indeed excellent choice for long battery life with low current to light output ratio



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