Recent content by Samba

6000 / (144/15) = 625 rpm The nuvinci does 0.5 - 1.8 ratios. At the lowest 0.5 ratio, 625rpm input gives 312.5 wheel rpm which ranges from 18mph(20" wheel) to 27mph(29" wheel). At the highest 1.8 ratio, 625rpm input gives 1125 wheel rpm which ranges from 67mph(20" wheel) to 97mph(29"...

The spread in the power usage of the cars, times the spread in the price of electricity. Don't know what a KWH of electric costs there, but it takes you 3-8km depending on the car and the drive.

Well negative doesn't sound good. Are those the ones that got hot? Seen the sticky thread 'lead free since 2003'? He goes thru a bunch of experiences with battery packs - a lot of it was with NiMH. They would get one cell in a pack reversing and had some ways around it. They all get hot...

7mph 600 watts, 50% efficiency is 600 watts of heat and 600 watts of go. Put the 25 amp controller in the sim and you get 10mph 700 watts, 60% efficiency is 470 watts of heat and 700 watts of go. So in terms of motor heat - the motor would much rather use 25A and go 10mph. Range too - its...

Top speed looks right - 30mph@26"wheel is 22@20". Range 30-40 miles on flat at 22mph - depending how bent your bent is. Performance and range on hills depends how steep - how long - how much weight. And then the best climbing speed for motor heating and range could be different from what you...

your 36v battery starts off at about 39v, When you draw 20 amps the voltage 'droops' down to below 36v. This droop gets worse as the battery is discharged. If you doubled up the batteries they would each see only 10 amps of that 20amp draw and droop less. From 39v fresh from the charger, the...

The motors don't care much about what kind of batteries are used. That battery configuration is for 24 volts. Regular car batteries are made for producing lots of amps for a very short time - for starting the car. They aren't made to be discharged till nearly empty - they are kept between...

2 ways You can make another 36v - thats 3 x 12v - and then connect the new 36v neg to the old 36vneg, new 36vpos to old 36vpos Or You can connect each new 12v to one of the old 12v - If you connect 2 batteries like this, in parallel, you add together the AH ratings and treat it as a...

from http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=14494 Probably not the exact motor you are looking at, but its a good clear chart with fairly typical curves and a good thread to read if you are looking at high amps and worried about overheating. I'd look past any motors where you...

A small hub motor - say 5" across, a circumference of 16 inches. Each 67 RPM of the motor will give you 1 MPH. They might normally do 350 rpm in a 26" wheel. That would make about 5MPH if its circumference is friction driving the tire. You would need it to turn much faster - 4X as fast...

What will you charge with 12v? Its not really close to anything - 3S charge at around 12.5v, or 11V if they are LFP. Would you run several in series? If so, how independent are the 'rails' on the PSU's that have 2,3,4 rails? Could you series connect different rails from the same PSU and...

500w cyclone @ 22V - around 800W 37A? Under 2C It should improve with the first few chargings - maybe enough for that motor. I don't see it ever reaching "The max rate is 20C , the continue rate 10000mah is 5 -10C ,20000mah is 10 -15C . " The differing C rate claims is odd - the 2 use...

Their controller claims 50A for 24/36/48v. The battery claims are odd - 60A max for the 36X16AH and only 35A max for the 48x12AH (should be 45A if its built like the 36v). I'd assume the 12AH battery claim is more accurate and the 16AH is really 46A Max (16/12 * 35a). 36vx50A = 1800W...

Those nipples look angry!

If you used normal rotation direction and attached to the disk brake bolts on the left, it would be the correct rotation. It could use a RH freewheel with thru-threading but flipped, or a plain sprocket and the motor's built-in freewheeling? -- You could run it on the right side - with the...