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Old 11-15-2012, 07:09 AM   #31
Thunder Pig
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Circuit breakers are marked in Amps because they trip on overcurrent, not excess power.

While this is true, the reason for the amps rating is because the voltage is constant in your example. The load or amount of current(amps) drawn is not. The breaker is set to open when the variable(amps) exceeds the rating. But if you want to be picky since power(watts) is voltage x current, the wattage used goes up and blows the breaker.

Nope, not an engineer just someone who fixes Uncle Sam's flying machines support equipment.

Knowledge is power, need more power, watts the matter with that?
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Old 11-15-2012, 08:58 AM   #32
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Quote:
Originally Posted by Thunder Pig View Post
Circuit breakers are marked in Amps because they trip on overcurrent, not excess power.

While this is true, the reason for the amps rating is because the voltage is constant in your example. The load or amount of current(amps) drawn is not. The breaker is set to open when the variable(amps) exceeds the rating. But if you want to be picky since power(watts) is voltage x current, the wattage used goes up and blows the breaker.

Nope, not an engineer just someone who fixes Uncle Sam's flying machines support equipment.

Knowledge is power, need more power, watts the matter with that?
Who said the voltage was constant?
The same breaker can be used for 120 or 240VAC.

A 15A breaker will hold at 1440W in a 120V circuit or 2880W in a 240V circuit.
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Old 11-15-2012, 10:09 AM   #33
def
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Originally Posted by MotorradMike View Post
Who said the voltage was constant?
The same breaker can be used for 120 or 240VAC.

A 15A breaker will hold at 1440W in a 120V circuit or 2880W in a 240V circuit.
Wait a minute...now we're mixing DC and AC and they are totally different...

AC amps are not the same as DC amps...remember RMS comes into play here.

So, are we all agreed, amps is current and watts is work?
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Old 11-15-2012, 10:15 AM   #34
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Yes that true, but once connected in circuit whatever voltage circuit it is used on stays the same. You wouldn't want your house voltage floating around up to 240 volts.

You are also correct, double voltage equals double watts.

I guess its just math when it comes down to it. So I'll just default back to my first statement, demand exceeds supply and the lights dim.

My supply of beer has exceeded my supply, off to the store!
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Old 11-15-2012, 10:20 AM   #35
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"So, are we all agreed, amps is current and watts is work?"


Yes. Well I do anyway.


Still out of beer though. Yes it's the middle of the day on a Thursday. Doesn't matter.
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Old 11-15-2012, 10:35 AM   #36
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Originally Posted by Thunder Pig View Post
"So, are we all agreed, amps is current and watts is work?"


Yes. Well I do anyway.


Still out of beer though. Yes it's the middle of the day on a Thursday. Doesn't matter.
Eeeegads man.......out of beer?

"911? Operator, please, I'm in deep guano here...my supply of Yuengling has fallen below acceptable limits and I can no longer function and my battery won't supply enough amps to start my motorcycle and so, I cannot get to the the beer store to replenish my cold malt beverage... send help fast"

"Sir, the mercy truck is enroute with the cold malt beverage you require...stay on the line with me....sir? Are you OK? Sir, are you having difficulty breathing? Sir?, Watts the matter sir?"


def screwed with this post 11-15-2012 at 10:40 AM
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Old 11-15-2012, 10:40 AM   #37
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How many watts?

1.21 Jigga watts of course!
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Old 11-15-2012, 11:14 AM   #38
def
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How many watts?

1.21 Jigga watts of course!
OK, enough of that....now that you're beer stock is back to normal, wanna sell your Speedie?

I need a speedie with the 3 spoke wheels and the round bug eyes, preferable scorched yellow...I do not find the newer models very attractive with their strange headlight form factor. I like the older model with a belly pan, fly screen and rear cover. I wonder if there is an underseat exhaust conversion for them?

How much for the old girl?
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Old 11-15-2012, 01:48 PM   #39
MotorradMike
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Originally Posted by def View Post
Wait a minute...now we're mixing DC and AC and they are totally different...

AC amps are not the same as DC amps...remember RMS comes into play here.

So, are we all agreed, amps is current and watts is work?
def, you started with the breaker panel!
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Old 11-15-2012, 01:59 PM   #40
def
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def, you started with the breaker panel!
Actually, I started at the power station where they make the stuff and there, those folks usually refer to their product in watts, sometimes KVAs. But it is current (amps, electrons or coulombs) that flows. Agreed Mike?
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Old 11-15-2012, 03:21 PM   #41
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Oy vey.
First, check all your connections. Grounds and power to the bus. A problem in either can cause this problem.


Assuming you've got a non-exotic (i.e. lead acid) battery:

Go to Napa, pick up a $50 load tester. This is just a big resistor with a volt meter built in. Load testing is the only definitive way to check a battery's health - the battery is shorted through the resistor, which dissipates that energy as heat. The volt meter will show the voltage during this discharge and indicate if the battery voltage is dropping faster than it should.

If the battery checks out, suspect the Alternator. Check the belt tension, probably not the cause, but its easy to fix. You can check the alternator output with any multimeter, it should read ~14v regardless of throttle. A multimeter with the ability to measure current will tell you what the amp output of the Alternator is.

If all that checks out, I've got no idea where to go next.
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Old 11-15-2012, 03:23 PM   #42
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Def I agree with you on the Speedie except for the belly pan, not a fan. But that's why mine doesn't have one. Underseat was available, Wolf made one that was nice but spendy. I also was not a fan, liked the high and tight better, but that's why I don't have one. I had to have the fastest color as yellow is for chickens. Pigs like green as green with envy. Sorry not selling it!

So what were we talking about again?
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Old 11-15-2012, 04:25 PM   #43
def
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Def I agree with you on the Speedie except for the belly pan, not a fan. But that's why mine doesn't have one. Underseat was available, Wolf made one that was nice but spendy. I also was not a fan, liked the high and tight better, but that's why I don't have one. I had to have the fastest color as yellow is for chickens. Pigs like green as green with envy. Sorry not selling it!

So what were we talking about again?
Ouhhhh....roulette green...my second favorite color.

I need one....I don't care what color it is...
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Old 11-15-2012, 11:17 PM   #44
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Everyone here is pretty much spot on - I would suppose it would depend on what you had electrically running when you were at idle. If you didn't have anything running then I'm with 'Twilight' - except I'm for taking in the battery to a local shop to have it tested.

Your Gerbings heated gear thermostat is actually cycling at 100% load, the dial on the thermostat is controlling the actual time duration when your heated gear is literally fully on or fully off. It's not a variable resistor anymore - so at idle I would expect to see your headlight dimming in sequence with your heated gear. In fact on my 650 Dakar I could see the headlight varying a little when running down the road at night with my heated gear on at near max.

For me any battery over 3 years old is suspect and when they go they go all at once - usually after stopping at a service station to fill up. Yep, that last two did just that...
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Old 11-17-2012, 09:38 AM   #45
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The electrical experts are all in violent agreement with one another . Me: - I changed the spark plug leads and caps on The Duchess, my old R80RT, and went for a ride. I have been too busy enjoying the nice weather to play with the other pedants today.

The Duchess has an HID headlamp, which has a constant-current power supply that will operate quite happily from a supply at anywhere from 9V to 24V DC. The brightness does not change at idle, even though the voltmeter typically drops from around 13.4V to around 12.2V.

Same thing with my R1100GS. However, on my GTS, which has a different model of HID with higher output, the headlamp will sometimes dim very briefly (more like a flicker) when at idle and the brakes are applied.
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