Appendix to Warren Winovich Report

Upgrade of the MGB Electric Sports Car

ABSTRACT

The MGB conversion project is unique in that it is equipped with a Curtis model 1238, low-voltage, inverter/controller and a corresponding, three-phase, 70-volt, Induction motor. The battery pack consists of eight lead-acid, gel-cell units rated: 96 Volts @ 100 A-hrs; energy storage of 9.6 kW-hrs. For lead-acid batteries operating at the 96-volt level, the usable energy at highway speeds is about half of the nominal 20-hour rate. Consequently, about 5 kW-hrs stored energy is available. With an economy of energy usage at highway speeds of 250 W-hrs/mi, the maximum range is about 20 miles (for 100% depth of discharge). A practical depth of discharge is 60 % to maintain an adequate reserve and to promote long battery lifetime. The range of the MGB electric car is limited to about 12 miles for everyday use - on the low end of practicality.

An upgrade of the MGB electric car is the replacement of the battery pack with lithium-ion units with higher capacity to increase range. Current pricing of lithium-ion batteries from China sources is $ 300 to $400 per kW-hr. This is almost twice as much as the replacement cost of lead-acid, gel-cells, at $200 per kW-hr. But, range and lifetime of the lithium-ion system outweigh the price difference.

This study presents an upgrade option that increases range to the 100-mile distance and increases battery lifetime to over 10 years (about 180000 miles). The upgraded MGB electric car would have performance figures comparable to the “best” production model available today.

Warren Winovich Electric Auto Association

Charter Member Silicon Valley Chapter

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