9.4 MIXED CONNECTION BETWEEN WECO, WECO 4K4PRO and WECO 4K4-LT BATTERIES
For a new system, we do not recommend installing a mixed solution with WeCo 4k4PRO and WeCo 4k4-
LT batteries.
When using WeCo 4k4PRO and WeCo 4k4-LT batteries, the
WeCo 4k4-LT batteries must be installed
first and then the 4k4PRO batteries
as shown in the figure.
Communication connections between batteries and inverter:
Batteries
are connected
IN PARALLEL
to each other.
•
CAN-A of
master battery
COM Port of
inverter
•
RS485-B of
master battery
RS485-A of
slave 1 battery
•
RS485-B of
slave 1 battery
RS485-A of
slave 2 battery
•
…
•
RS485-B of
slave N-1 battery
(second last)
RS485-A of
slave N battery
(last)
Power connections between batteries and inverter:
Batteries must be connected in a "loop.”
•
Positive input (+) of
master battery
connected to positive input (+) of
inverter
.
•
Positive input (+) of
master battery
connected to positive input (+) of
slave 1 battery
.
•
Negative input (-) of
master battery
connected to negative input (-) of
slave 1 battery
.
•
…..
•
Positive input (+) of
slave N-1 battery
(second-last) connected to positive input (+) of
slave N battery
(last).
•
Negative input (-) of
slave N-1 battery
(second-last) connected to negative input (-) of
slave N battery
(last).
•
Negative input (-) of
slave N battery
(second-last) connected to negative input (-) of
inverter
.
NOTE:
When switched on for the first time, the WeCo batteries receive a command from the inverter to
start regular operation only when all of them have collectively reached a state of full charge (i.e. a SOC
level of 100%).
