Mixed Connection Between Weco, Weco 4K4Pro And Weco 4K4-Lt Batteries - ZCS AZZYRRO 3-6-ZSS-HP Quick Manual

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%).