Dead sporty.....need some advice
#11
05-13-2012, 02:01 PM
But go ahead, jump your bike with it's little dead battery with a 100+ amp source. No skin off my back.
BTW, you do know that the regulator in the Sporty sinks to ground, right?
Oh, and that dead battery on the bike, it's a BIG low resistance catch can. That's why when you throw a variable current (AMP) charger on a dead battery, it pegs the Amp meter on the charger.
Last edited by cHarley; 05-13-2012 at 02:07 PM.
#12
05-13-2012, 02:09 PM
Road Warrior
Yea, I know all about Ohm's law and quite a bit more electrically, I'm an electrical engineer.
But go ahead, jump your bike with it's little dead battery with a 100+ amp source. No skin off my back.
BTW, you do know that the regulator in the Sporty sinks to ground, right?
But go ahead, jump your bike with it's little dead battery with a 100+ amp source. No skin off my back.
BTW, you do know that the regulator in the Sporty sinks to ground, right?
#13
05-13-2012, 02:13 PM
Outstanding HDF Member
I see more than one person missed a few classes in the high school.
Why don't you do a little test.
Take a 12 V, 60 W light bulb and connect it to a running truck - so called 100 A source. Take a note of current generated by light bulb. It will be just over 4 A.
Now take the same bulb and connect it to your running Sporty - so called 30 A source. Compare amperage readings, they will be practically same.
Because current is determined by bulb, not source.
There can be a small difference if the charging systems are not producing exactly same voltage. This is determined by Ohm's Law.
A little more education:
Metric system units that are named after a scientist are uppercase.
V - volt - named after Alessandro Volta
A - amper - named after André-Marie Ampère
Lowercase v denotes speed in formulas, in case if you are interested.
Why don't you do a little test.
Take a 12 V, 60 W light bulb and connect it to a running truck - so called 100 A source. Take a note of current generated by light bulb. It will be just over 4 A.
Now take the same bulb and connect it to your running Sporty - so called 30 A source. Compare amperage readings, they will be practically same.
Because current is determined by bulb, not source.
There can be a small difference if the charging systems are not producing exactly same voltage. This is determined by Ohm's Law.
A little more education:
Metric system units that are named after a scientist are uppercase.
V - volt - named after Alessandro Volta
A - amper - named after André-Marie Ampère
Lowercase v denotes speed in formulas, in case if you are interested.
A 0.54 Amp (60 watt) lightbulb in your house does not blow up because it is fed by a 20 Amp circuit breaker. The lamp is "pulling" power, it's not the breaker that is pushing in the bulb.
#14
05-13-2012, 02:14 PM
Road Warrior
I understand electrical engineers may have hard time understanding this, but hopefully other people will benefit from my postings.
#15
05-13-2012, 02:17 PM
Road Warrior
Ohm's Law, again. Breaker is a passive element, it does not affect the current. 60 W 12 V lightbulb will draw over 4 A. 0.54 A current is determined by resistance of filament, which is much higher for a 120 V source.
#16
05-13-2012, 02:30 PM
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#17
05-13-2012, 02:34 PM
Yes, and since all electrical loads are connected in parallel, in this case the dead battery is a load, too, the current generated by dead battery affects only the battery itself - it does not mean any other load on bike (ECM, fuel pump, etc) will get higher current than usual.
I understand electrical engineers may have hard time understanding this, but hopefully other people will benefit from my postings.
I understand electrical engineers may have hard time understanding this, but hopefully other people will benefit from my postings.
I guess you've never seen a little (12 amp-hour) dead battery explode when it's hit with 100+ amps.
And while we're at it, you said;
"Lowercase v denotes speed in formulas, in case if you are interested."
No, it stands for velocity, speed and velocity are not the same thing.
#19
05-13-2012, 02:40 PM
Road Warrior
Alright, you've got me here. I didn't double-check terms, and since English is fifth language for me I got this one wrong.
#20
05-14-2012, 07:16 AM
Elite HDF Member