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The power supply in the smart fortwo electric
drive is provided via two separate on-board elec-
trical systems:
• High-voltage on-board electrical system with
high-voltage battery
The high-voltage battery is charged via the on-
board charger when connected to an external
power supply.
In deceleration mode and when braking, the high-
voltage battery is charged through regenerative
braking and the electric motor then operates as a
generator.
• 12 V on-board electrical system with 12 V
battery
The 12 V on-board electrical system is supplied
with power by a DC/DC converter in the power
electronics control unit. The DC/DC converter
transforms the high direct voltage from the high-
voltage on-board electrical system into 12 V
direct voltage. The power electronics control unit
thus performs the task of the alternator on a
vehicle with combustion engine.
Introduction of smart fortwo electric drive (3rd Generation) • Model Series 451
On-board electrical system/power supply
Information on the high-voltage system
General
The high-voltage system consists of several
components. The individual components are
connected by high-voltage-carrying electrical
lines. The high-voltage on-board electrical
system is a fully insulated network. Neither the
positive terminal nor the negative terminal are
connected to the vehicle ground.
i Note
Identification of high-voltage components
and high-voltage lines
Every component of the high-voltage on-board
electrical system installed in the vehicle is iden-
tified by a yellow warning sticker. All electrical
lines conducting high voltages are marked by a
warning color (orange).
Warning sticker
P08.00-2008-00
17
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