Just wondering what the best procedure is to add a third Lithi2-16 battery to my installation. I currently have two Lithi2-16 batteries installed in parallel connected to a bus bar which is in turn connected to 2 EG4 600xp inverters. In have my new battery all ready to connect but am concerned with the proper way to do the initial turn up. It states in the book to "ensure that the SOC of the battery system is as consistent as possible". How critical is this? Does this mean within a few percent of charge? Or a few volts? I don't want to create problems with the new or the existing batteries. Also, I am assuming the firmware should match. Anything else that I should check? Any advice would be appreciated!
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Hi,first, upgrade all batteries to the latest version, RX04.
If there is a voltage difference, the higher-voltage battery will charge the lower-voltage battery. However, this charging current is very small and sometimes is not recorded by the BMS, which can cause SOC confusion. Over time, this balancing process will eventually stabilize, and performing a full charge SOC calibration afterward will restore normal operation.
If the SOC difference between the batteries is very large, this SOC confusion may last for a long time. Therefore, we recommend that the SOC levels be as close as possible before paralleling the batteries. This way, the SOC confusion will be minimized or may not be noticeable at all.