EV TRACTION MOTOR CONTROLLER COMPARISON

All information is a snapshot taken in September 2009 and is subject to change without being updated here. Issues highlighted in yellow or red. Sorted from left to right by popularity on EV Discussion List Photo Album per www.evalbum.com/cntrl.

Parameter Comment Series DC Motor Controllers:         Induction AC Motor Controllers:      
Make   Curtis Kelly Logisystems Zapi Navitas
(formerly SRE)
Azure Dynamics Brusa MES-DEA Curtis
Number of users on EVDL   738 105 43 24 8 59 18 6 0
Estimated Forward Efficiency of Drive System   75% 75% 75% 75% 75% 85% 85% 85% 85%
Efficient Regenerative Braking Setup   no no no no no yes yes yes yes
Cooling Method   sealed with case convection only sealed with case convection only sealed with fan on heat sink water water sealed with case convection only
Operating temperature range, degrees C  
Monitor port   none, but current cuts back and switching frequency changes to audible 1.5 KHz when temperature limit crossed
Models   1221C-7401 for 400 amp peak
1231C-7701/8601 for 500 amp peak
Nominal DC Operating Voltage   72 to 120V for 1221C and 1231C-7701
96 to 144V for 1231C-8601
Continuous Current Output, amps   150 for 1221C
225 for 1231C
Dimensions, inches   12x7.1x3.2 for 1221C
13.3x8.6x3.7 for 1231C
Weight, pounds   13 lb for 1221C
19 lb for 1231C
Distributors and their prices:
Canadian EVs
Errington, BC 1221C and 1231C offered, but prices not posted         Azure Dynamics offered, but prices not posted      
Cloud Electric Clarkesville, GA $1,399 for 1221C
$1,585 for 1231C
yes yes   yes        
Electro Automotive Felton, CA $1,325 for 1221C
$1,725 for 1231C
        yes      
EV Parts Sequim, WA $1,399 for 1221C
$1,595 for 1231C-7701
$1,475 for 1231C-8601
  yes            
EVs of America Wolfeboro, NH 1221C and 1231C offered, but prices not posted                
EV Source Logan, UT $1,588 for 1231C-8601   yes            
KTA Services Ramona, CA $1,050 for 1221C
$1,495 for 1231C
              $4,500
includes motor
Metric Mind Happy Valley, OR             yes yes  
Thunderstruck Motors Sebastopol, CA $1,050 for 1221C
$1,450 for 1231C
              $4,500
includes motor
Column last updated   9/30/09 9/30/09 9/30/09 9/30/09 9/30/09 9/30/09 9/30/09 9/30/09 9/30/09

Note: As of September 30 2009, total motor controllers listed on EVDL is 1920. 4 of the top 10 as well as others offered by EV component suppliers listed above are shown, totalling 1001 or 52%. Auburn Scientific, Cafe Electric, DC Power Systems, General Electric and Sevcon are also popular motor controllers making up 319 or 17%, but they are either no longer made or not readily available in the US, so they are not included above. Alltrax, Yi Yun,Crystalyte and Sevcon are also popular motor controllers making up 332 or 17%, but they are smaller, best for mini cars, motorcycles or bicycles only and are not covered here.

Manufacturers known to have chargers but do not serve individuals and hence were not included above include AC Electric Vehicles, AC Propulsion, Enova, UQM, Reliance and TM4.

If you have any corrections, questions, updates or additions to the information on this page, please contact the NBEAA per information posted on www.nbeaa.org.