Quick Answer
Yes, you can parallel connect different LFP battery brands safely as long as they have the same voltage and follow specific guidelines.
Safety Considerations
When parallel connecting different LFP battery brands, it’s crucial to ensure they have the same nominal voltage (3.2V per cell for LFP) and are from the same chemistry type (e.g., LG Chem and Panasonic LFP batteries). The battery management system (BMS) should also be designed for parallel connections and be able to handle multiple batteries with varying capacities and state of charge (SOC). This is typically a requirement for commercial-grade BMS.
Compatibility and Configuration
To parallel connect different LFP battery brands, each battery should have its own BMS. Connect the batteries in parallel using a single set of positive (+) and negative (-) wires, ensuring that all batteries are connected to the same common positive and negative busbars. It’s essential to use a high-quality, heavy-gauge wiring that can handle the combined capacity of the batteries. The recommended wire size is typically 2 AWG for a 10 kWh system or 4 AWG for a 20 kWh system.
Voltage and SOC Monitoring
To ensure safe parallel connections, monitor the voltage and SOC of each battery separately. This can be achieved using a multi-parameter meter or a BMS with remote monitoring capabilities. The system should also have an automatic equalization function to prevent overcharging and maintain the health of the batteries. Regularly check the batteries for any signs of imbalance, such as unequal voltage or SOC levels, and adjust the charging strategy accordingly.
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