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Test drive data
The test drive included a wide range of conditions - urban roads,
dual carriageways, country lanes, speed-bumpy streets, and slow-speed
manoeuvers. The instrumentation logged battery current and voltage
and the vehicle's speed.
From these data we can estimate three interesting things:
- The overall energy consumption in kWh per 100 km.
- The efficiency of energy-recovery by the regenerative braking -
by looking at a single rapid braking event from top speed
down to zero.
- The overall contribution of regenerative braking to
the vehicle's average performance.
The energy used, measured at the battery, was
60.6 MJ during a 46.6 km trip.
That's 36.1 kWh per 100 km.
At the socket, the electricity required would be bigger,
because battery-charging systems lose some energy.
The Modec folks said their measurements showed that
with best practice, the overhead at the socket was about 5%;
but if the charger was left switched on unnecessarily long, the overhead
was bigger, about 54%. Taking the best of these two figures,
the truck I drove was using at least 38 kWh per 100 km at the socket.
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Power and speed for the whole test drive
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