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Run flat bicycle tires

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Bruce S:

--- Quote from: dnix71 on October 28, 2010, 05:26:46 PM ---It's "450" watts if you believe Walmart and Currie. 24v. I took the tube out of the back tire and put a special thick no flat pneumatic tube in it and the original tire back. The wider tread required for the tube I bought had a lot higher rolling resistance than the original and it wasn't worth the extra work pedaling or the loss of range on batteries.

There is something not quite right about the wiring. If I full throttle the battery gauge drops way off. There is something limiting current to the controller. As soon as I back off on the throttle the gauge pops right back up to green. I have 3 battery packs in parallel, 2 two-packs of sla's and Bruce's nicads so it can't be for lack of battery current.

--- End quote ---

dniz71,
That gauge is working correctly :D. Our 48Vdc 550 watt e-bike's gauge works the very same way.
That's what i like about the NiCds, the ability to dump their current to the controller at a higher rate than the SLA's

Currie is very well known for a good consistent product and at 450 watts that's about 19Amps your dumping to it right off the batt, so your gauge is working perfect.
I know doesn't seem right but I did a whole bunch of testing with the watt's up meter when we switched to the NiCds, to ease my mind.

Now of course you may need to invert in a watt's up type meter while staying with the NiCds as the gauge will not be accurate due to their holding the voltage until the bitter end  ;)
The gauge uses the voltage difference for Lead-Acid based batteries to give you its fuel type readings.
Have fun!!
Bruce S

 

ghurd:
The gauge is reading voltage.
The current causes voltage loss in the wires.
The gauge sees less voltage, so it shows low.
G-

Norm:
Yes tire tread and width sure makes a difference.....I was used to an old ten speed with nearly bald
tires pumped up hard as a rock.
Then I got a mountain type 21 speed ....tires twice as wide and snow tire tread....
even in one of the lower speeds ....it's quite an effort in comparison.

What a neat thing it would be to have variable ratio for speed control
where the motor would be full on but the lowest ratio at 5mph....not needing
much torque the current drain would be quite small .

I think back to the old days ( Barely before my time....I'm not quite that old) when car
tires weren't quite as tough and they carried 2 or 3 spares?? LOL !

Norm.

Norm:

--- Quote from: Bruce S on October 29, 2010, 09:32:43 AM ---
 
 I know doesn't seem right but I did a whole bunch of testing with the watt's up meter when we switched to the NiCds, to ease my mind.

Now of course you may need to invert in a watt's up type meter while staying with the NiCds as the gauge will not be accurate due to their holding the voltage until the bitter end  ;)
The gauge uses the voltage difference for Lead-Acid based batteries to give you its fuel type readings.
Have fun!!
Bruce S 

--- End quote ---

 Ah yes if you have a what's up type meter and done a whole bunch of testing....
you would have known....

 so Bruce ?....Ghurd ?   is there a what's up type meter?.....Mainly my concern is that actual WattsUp meters
seem to cost so much! for a little gizmo the size of my digital BELL speedometer/odometer/average speed/trip meter/clock/ etc.
they both display eqivalent information on about the same size screen.
 I could get by with just a multimeter if the dang thing while charging a battery.....even at a steady
rate of pedaling ....the amperage jumps all over in a range of .8 to 3.8 and sometimes even 4.2
not even steady enough to figure an average.

Excuse me if I seem to be hi-jacking this thread.
Norm

Bruce S:

--- Quote from: Norm on October 29, 2010, 10:43:35 AM ---
--- Quote from: Bruce S on October 29, 2010, 09:32:43 AM ---
 
 I know doesn't seem right but I did a whole bunch of testing with the watt's up meter when we switched to the NiCds, to ease my mind.

Now of course you may need to invert in a watt's up type meter while staying with the NiCds as the gauge will not be accurate due to their holding the voltage until the bitter end  ;)
The gauge uses the voltage difference for Lead-Acid based batteries to give you its fuel type readings.
Have fun!!
Bruce S 

--- End quote ---

 Ah yes if you have a what's up type meter and done a whole bunch of testing....
you would have known....

 so Bruce ?....Ghurd ?   is there a what's up type meter?.....Mainly my concern is that actual WattsUp meters
seem to cost so much! for a little gizmo the size of my digital BELL speedometer/odometer/average speed/trip meter/clock/ etc.
they both display eqivalent information on about the same size screen.
 I could get by with just a multimeter if the dang thing while charging a battery.....even at a steady
rate of pedaling ....the amperage jumps all over in a range of .8 to 3.8 and sometimes even 4.2
not even steady enough to figure an average.

Excuse me if I seem to be hi-jacking this thread.
Norm

--- End quote ---
Norm;
 For me these take the place of needing multiple meters. They do cost, but I get so much fun out of working with it :D. The cost was worth it's ability to store the history of both voltage and current used and incoming at a glance.
The one I saw posted in another thread from AU is a better price for basically the same, but I think shipping would eat the savings.

Amy's e-bike got stuck several times while I worked out the kinks  :( the little meter doesn't care what battery type you use. Plus digital is Soooo much cooler to look at  ;D.
Did make an adapter for 4V input.

Cheers
Bruce S

 

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