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“Operation and installation manual”
EN
3.4 System Overview
A
B
C
D
G
E
F
Ref. Part
Function
A
EV
Electrical Vehicle to be recharged
B
Parking space
To park the EV during charge session
C
Front of the EVSE
Side of EVSE with EV connectors and HMI (User Interface)
D
EVSE
EV charger
E
AC input cable
To supply the input AC voltage to the EVSE
F
Power distribution board
AC grid input protection and distribution circuits
G
EV charge cable
To connect the EV to the EVSE
3.5 Power allocation strategies
The EVSE can be configured to operate with different power allocation strategies. The configuration can be
changed at any time through the EVSE configuration tools.
The configuration of the EVSE allows for these power allocation strategies:
Power allocation strategy
Available for EVSE models
Sequential
All models
Concurrent
Models with more than one DC outlet (except for Terra 94)
Dynamic ‘Fair share’
Models with more than one DC outlet (except for Terra 94)
3.5.1 Sequential power allocation
When the EVSE is configured for sequential power allocation, it
can serve one EV at a time with DC fast charging.
In this configuration the EV charging power is the maximum
power available to the EVSE, the rated power output. Effectively
the maximum power output can be less than the rated power
output because of power constraints. For example, the power
output can be permanently limited due to site current or power
constraints, or temporarily limited by power management sys-
tems.
Only one DC charge session can be performed at a time. When a
second EV is connected to the EVSE, the EVSE must first finalize
the first charge session before a new charge session can start.
NOTE
EV charging with the use of the CCS standard can ‘fall asleep’ if the EVSE does not start the
session within a few minutes. This is a common issue. It is recommended to connect a second
EV only shortly before the first charge session ends.
0 - 99%
100%
0 - 99%
2
1
0 - 99%
50%
0 - 99%
50%
2
1
51 - 99%
50%
51 - 99%
50%
2
1
0 - 50%
50 - 100%
50 - 100%
0 - 50%