Using MightyBoyEV - Li-Ion Upgrade "On Road" Final Data Results
Actual "On Road" Data Results (Final Set)
14/12/2010
Quick Summary:
Distance Travelled | Power Taken Out | Power Put Back |
51.5 km (32 Miles) | 5630 watt-hrs (75 Ah from pack) |
6800 watt-hrs |
Overall Efficiency (energy used vs energy put back in) | 83% | |
Watt-Hours/km from the batteries | 110 w-h/km (or 187 w-h/mile) | |
Watt-Hours/km from the power plug (or ATW "At the Wall") | 132 w-h/km (or 212 w-h/mile) | |
DOD for 51.5 km trip | 42% DOD | |
Projected 80% DOD range | 100km (worst case) |
Pack details: 24 off SE180Ah cells - Nominal voltage = 3.3v
(or 24x3.3Vx180A= 14,250 watt-hrs total - about 11,000 watt-hrs for 80%DOD)
All the details:
Out of the pack:
Details of the test run - power taken from the
pack
(as taken from the Cycle Analyst with a fully charged pack - EV driven fairly hard on this run to get a worst case situation)
Distance travel = 51.5km (or 32 miles)
MaxSpeed = 85km/h (or 53mph) - limited by road speed limits in my area of 80, 60 or 50 km/h
AvgSpeed = 49.7 km/h (or 30mph)
Gear Used = 4th only
Trip duration = 1 hour and 11 mins
MaxAmps = 440 amps
VMin = 65volts (as occurred when 440 Amps pulled - measured going into the motor controller so takes into account the voltage drop on high current cables etc)
Watt-Hours per Km = 110 w-h/km (or 187 w-h/mile)
Watt Hours used from pack = 5630 watt-hrs
75 Ah from pack (so about 42% DOD which would indicate a range of 100km would be achieved @ the 80% DOD figure)
_______________________
Other Info (mainly for my reference):
Final Pack Voltage = 78.9 Volts with all cells measuring 3.28 Volts (within an amazing range of 3.283 to 3.278 – how good is this technology!)
Trip Temperature (air) = 25 deg C
Battery Temperature (at pack) = 24 deg C
MaxMotor Temperature = 58 deg C
Hottest area on Transaxle Housing = 40 deg C
MaxController Temperature = 38 deg C
Acceleration (depends on how I program the controller) = best about 5 Sec for 0 - 60 km/h 4th gear only (450 Amp max)
Smokes the tyres in 3rd on acceleration! A good way to break stuff....
Into the pack:
Details of the full
re-charging process - power put back into the pack (as
read via a Watts Clever model MS-6118 series plug in power
meter)
Input 226 Volts @ 7.15 Amps (as measured by power meter) = 1616 watts
Output current (into pack) was 18 Amps @ a measured 80.2 volts during part of the 1st bulk charge phase = 1444 watts
This tends to indicate a charger efficiency of 1444/1616 x 100 = 89%
In addition, the power factor rating was shown to be .98
Elcon claim the charger has a "Full Load Efficiency" > or = to 93% with an AC Power Factor of > or = to .98
The measurement made today seems close to Elcon's claims.....
In my case, the total watt -
hours taken from the wall to completely recharge the pack (including all
three stages) was found to be 6800 watt - hours
So for the 51.5 km
(32 Miles) trip, that would
equal 132 w-h/km (or 212 w-h/mile)
at the wall
Thus at my current "Off-Peak"
rate of 11 cents per kilowatt-hr the recharge cost would be 75 cents. So that
51.5 km (32 Mile) trip
would cost 1.5 cents per km (or 2.4 cents per mile)
Overall efficiency:
(energy used vs energy put back in)
5630 watt-hrs/6800 watt-hrs = 83%