Using MightyBoyEV - Battery Upgrade October/November 2010 - Page 6
Starting to look at "On Road" data
The PakTrakr Automatic Data Logger looks like this.....
The PakTrakr description (from The PakTrakr website):
The ES1R has its own microprocessor and 2MB FLASH RAM for logging serial data
from the PakTrakr. The device can be programmed to store all incoming data, or to skip
a user-determined number of data strings and store only every “nth” string. Capturing all
PakTrakr data would fill the ES1R’s FLASH memory in a matter of hours (a 6-battery
system outputs a string of 100+ characters each second). But programming the ES1R
to log every 60
th string (once per minute) or every 600th string (once every ten minutes)or even every 3600
th string (once per hour) would allow the ES1R to log data over anextended time period of days, weeks, or even months.
The USB/serial interface allows easy connection to a PC.....
Data strings look like this (CSV)......
Some simple commands are available - the most useful being able to select the sample rate.....
Here is a trial Excel graph I did to look at how balanced the cells are (*only after 3 charge cycles - so just playing around)
|
MightyBoyEV Power Consumption Chart December 2010 |
|
|
3.3 volts X 24 cells X 180Ah = 14256 w-h |
Range @79.2 Volt Pack@110 w-h/km |
|
1760 w-h (12% DOD) |
16 km |
|
3520 w-h (25% DOD) |
32 km |
|
5280 w-h (37% DOD) |
48 km |
|
7040 w-h (49% DOD) |
64 km |
|
8800 w-h (62% DOD) |
80 km |
|
10560 w-h (74% DOD) |
96 km |
|
12320 w-h (86% DOD) |
112 km |
|
14080 w-h (98% DOD) |
128 km |
And the range after a few days use appears to look like this....