Dynamic Electric Bike Battery Test

[Boyntonstu]

[youtube]https://www.youtube.com/edit?o=U&video_id=MawtwnBB6fk[/youtube]

A simple way to test the battery cells on a stationary electric bicycle.

 

[d8veh]

I think your calculation of the current is way off. You need to calibrate it against a known current somehow. why not get a wattmeter that will tell you the current directly?

http://www.ebay.co.uk/itm/Digital-Watt-Meter-60V-100A-Battery-Checker-Voltage-Current-Power-Analyzer-Meter-/281702231757?hash=item4196c2eecd

I posted some stuff about it with a spreadsheet to do the calculation:

https://endless-sphere.com/forums/viewtopic.php?f=2&t=55094

 

[Boyntonstu]

I forgot about my video: In fact, the video Amp reading is correct because I used more than a foor of wire to calibrate it to:
1 mA = 1 A.

In order to measure 100 Amps DC I am using a multimeter and a 18.75" length of 0.128" Diameter solid copper wire (#8). Not #10.

The voltage drop measured across the wire in mllli-Volts directly equals the current in Amps.

After the test it ran at 18 MPH.

View: [youtube]https://youtu.be/ZPVJ1OHz8BI[/youtube]

[youtube]https://www.youtube.com/edit?o=U&vide[/youtube]