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By Edward Booth, November 2008-11-18 - page 3 / 6





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  • L91-4003 for performance and speed.

  • 203-06-4001 for racing and sport, but lower range.

Vehicles 750-1250kg:

  • X91-4001 very efficient, long range, sedate performance.

  • L91-4003 good performance and acceleration.

  • 203-06-4001 high performance and/or hilly terrain.

  • FB1-4001 for racing and sport, or heavy payloads

Vehicles 1250-1600kg:

  • L91-4003 for commuting with few hills.

  • 203-06-4001 good performance in hilly terrain.

  • FB1-4001 hilly terrain and heavy payloads.

Vehicles 1600-2000kg:

  • 203-06-4001 for city commuting

  • FB1-4001 for heavy loads and hilly terrain.

Clearly, there is a trade-off between power and range. An increase in voltage will increase the power, while maintaining the range to some extent, but with an increase in overall weight.

My article on selecting a suitable vehicle for your EV conversion sheds more light on this. An FB1-4001 running on 72 volts would give less that startling performance and poor range in a heavy vehicle.

A would-be builder should be able to find a suitable motor in that lot, but it is essential that he/she answer the decision questions very honestly.

Remember that the weight goes up with motor size, and the number of batteries (and weight) rises with voltage. Even Li/ion batteries weigh a fair bit, although they tend to be only about half as heavy as Pb/acid.

The decisions don’t end there. Next one must decide on whether to use regenerative braking, as this will determine your circuitry. The current draw is also a factor.

The choice of controllers is fairly limited. Alltrax make an excellent range of controllers up to 72volts and 450amps. These will power the smaller 6.7” motors quite well, and for a fraction of the cost of the larger units.

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