Connecting multiple batteries in series Each individual battery needs to have been fully charged and balanced. Connect a maximum of four 12.8V batteries or a maximum of two 25.6V batteries in series. Connect the negative to the positive of the next battery. Fuse the series string on the positive side.
On delivery, the inverter/charger is set to standard factory values. These settings are generally suitable for single-unit operation. It is a possibility that the standard charging voltage does not suit your batteries. Consult the manufacturer's documentation or your battery supplier. 5.2. Explanation of settings
Why charge batteries before use Lithium batteries are only approximately 50% charged when shipped from the factory. This is a transportation safety requirement. However, due to differences in transportation routes and warehousing, the batteries do not always have the same state of charge by the time they are installed.
Check all BMS cable connections and make sure the connector screw rings are screwed all the way down. Connect with VictronConnect to each battery. Check if each battery has the most up-to-date firmware. Check if each battery has the same settings. Connect the system positive and negative DC cable to the battery (or battery bank).
Battery settings The default settings in the battery are suitable for almost all applications. There is no need to change these settings unless the application requires very specific conditions. If settings need to be changed, use the VictronConnect app. To access the settings, click on the settings symbol .
Always use a BMS-controlled charger when individually charging lithium batteries. If, for a specific reason, the initial charge procedure needs to be performed without a BMS (not recommended), check the Initial charge procedure without BMS chapter in the appendix for details.