EVBox Audi Wallbox - Overload Protection

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Product information
The Overload Protection feature of the Audi
Wallbox is aiming to allow customers to use
as much of their facility’s power capacity as
possible.
Due to physical restrictions or contractual
power capacity limits of the house power
supply, customers might face the need to
have their wallbox’s maximum charging
power limited.
Ordinary Charging Power Limitation
Usually, when evaluating a wallbox’s
maximum charging power, the residential’s
peak load needs to be considered. Doing
so, a wallbox’s charging power will usually
be limited to a static as well as rather low
value, since a crucial power scenario is to be
prevented.
However, such crucial power scenarios occur
rather seldomly, which leads to the fact
that a wallbox will also operate with the
limited charging power during times where
the residential load would allow for the
vehicle to be charged with higher power. As
qualitatively illustrated in the illustration
below, the customer is therefore not able
to use the full potential of his power supply
in order to charge the vehicle as fast as
possible.
Dynamic Power Limitation with the Audi
Wallbox
With the Overload Protection, the Audi
Wallbox oers a comfort feature to enable
customers to always charge their vehicles
at the fastest speed possible. By installing
additional current sensors (Current
Transformer coils = “CT coils”) in the house’s
electric installation and conguring the Audi
Wallbox according to the local restrictions,
the Audi Wallbox will charge the vehicle
with as much power as possible while at
the same time ensuring to stay within these
local restrictions. Given the same residential
load and local restrictions, this will charge a
vehicle with up to the full charging power as
illustrated in the gure hereafter.
Overload Protection
This section introduces the Audi Wallbox's Overload Protection and provides guidance for
installing the needed components. In addition, all technical parameters and restrictions of
the Audi Wallbox's control system are listed for certied electricians to be able to decide on a
proper installation design.
This is to ensure that the sum of
electrical power used for everyday life
(residential load) and charging power for
the electric vehicle will not exceed the
given restrictions, and thus might lead to
a tripping breaker or rupturing the house’s
main fuse.