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GREEN MOTION BUILDING INSTALLATION MANUAL
MN191028EN
January 2022 www.eaton.com
00
Title
Example
Three EV chargers will be installed in a building with a maximum current capacity of 100 A. The maximum load of all
other installed equipment is 60 A. The electrical infrastructure supplying the EV chargers can supply 50 A. There is no
energy meter present and EV charger 1 is reserved for an essential service vehicle that should always be charged as
fast as possible. The parameters for the three EV chargers in this case should be as follows:
(6)
The electrical infrastructure supplying the EV chargers can supply 50 A, however the maximum load of all other
installed equipment is 60 A. Maximum current capacity – maximum load of all other installed equipment = Maximum
available current for EV charging. 100 A – 60 A = 40 A.
EV charger 1
EV charger 2
EV charger 3
Dynamic load balancing enabled
No
No
No
Mode
Master
Node
Node
Phase balancing limit
N/A,
see Section 8.3
N/A,
see Section 8.3
N/A,
see Section 8.3
Energy meter enabled
No
No
No
Maximum available current for EV charging
(6)
40 A
40 A
40 A
Maximum current capacity of the building
100 A
100 A
100 A
Priority of EV charger
10
5
5
8.2.3 Dynamic load balancing
For dynamic load balancing the Eaton load balancing algorithm uses the two parameters MAXIMUM AVAILABLE
CURRENT FOR EV CHARGING, MAXIMUM CURRENT CAPACITY OF THE BUILDING and the input from the energy
meter to calculate the total available current for EV chargers.
IF the total available current for EV chargers is LOWER than the parameter MAXIMUM AVAILABLE CURRENT FOR EV
CHARGING, the total available current for EV chargers is calculated as follows:
However, IF this calculated total available current is HIGHER than the parameter MAXIMUM AVAILABLE CURRENT
FOR EV CHARGING, the latter value is used instead:
The algorithm then divides the total available current over the EV chargers, considering:
•
Number of cars connected
•
Maximum current capacity per car
•
Energy delivered per car
•
Charging stations’ priorities.
The parameter PRIORITY OF EV CHARGER determines the importance the Eaton load balancing algorithm attaches to
each EV charger. This parameter can differ from one EV charger to the next.
[Maximum current capacity
Total available current
IF:
THEN:
< Maximum available current for EV charging
- Energy meter reading]
- Energy meter reading
= Maximum current capacity
building
building
dynamic
[Maximum current capacity
Total available current
IF:
THEN:
> Maximum available current for EV charging
= Maximum available current for EV charging
- Energy meter reading]
building
dynamic
Table 11 . Example of static load balancing
