All were tested in the same circumstances, trying to establish a standard methodology for achieving the results applicable in each case. Tests were carried out on the dynamometer, so that all of them could improve the same virtual path and under controlled temperature conditions. The first temperature was set at 24 ° C (75 ° F), which can be considered as the optimum operating temperature of the battery. The same test was carried out at low temperature, -6.6 ° C (20 ° F) and at high temperature, 35 ° C (95 ° F).
The test results were fairly uniform in the five tested models. In the case of low temperatures, the autonomy is reduced by 12% if the cabin air conditioning system is not used. When this began, the loss of average autonomy was 41%. At high temperatures the loss of autonomy was 4% without starting the air conditioner, and 17% when this service was connected.
These results show that in cold climates the loss of autonomy is significantly higher than in very hot climatic conditions, regardless of whether the air conditioner is built in cars. This is due to the fact that, apart from the heating of the cab, this system is also responsible for regulating the battery cooling circuit temperature, in the event that it exists. Although it is possible to decide whether to start the air conditioner, it is not possible to operate this other service.