Solar MD SS4143-11, Installation Manual

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Battery Cluster
A battery cluster is a group of one or more batteries connected on the same DC Bus. All
batteries in the cluster must be connected on CANBUS1 and CANBUS2.
3.4. Cluster Data
All batteries in the cluster process the information of the other batteries and calculate a
CSD (Cluster Summary Data). This data contains:
● Role - The battery role in the cluster can be Master or Slave.
● Total Batteries in Cluster - The total amount of batteries in the cluster.
● DC Connected Batteries - The amount of batteries that are connected to
the DC bus. Batteries with error are DC isolated and they are ignored.
● Online Batteries - The sum of DC connected and DC disconnected batteries
that are communicating on CANBUS1
● Offline Batteries - The sum of batteries in the cluster which are not visible to
the cluster. These are the batteries switched off or removed.
● Average Capacity - Average capacity from all DC Connected batteries.
● Total Current - The sum of the current from all DC Connected batteries.
● Average Voltage - Average voltage from all DC Connected batteries.
● Charge Control Current - Battery internal Algorithm based on CSD input
used to calculate Charge current value.
● Discharge Control Current -
● Charge Control Voltage -
● Discharge Control Voltage -
● Min Cell Voltage -
● Max Cell Voltage -
3.5. Master Battery
When the cluster contains more than one battery, automatically one of them will be
marked as Master.
Only the master battery communicates with the inverter on CANBUS 2. The information
sent to the inverter is based on CSD and translated differently based on the inverter
type.
In case when the master is lost, the cluster will promote the next available battery as
master within 5 seconds.
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