How Lithium Batteries Can Be Paired in Parallel

Modified on Thu, 06 Jul 2023 at 10:34 AM

Can 5KW and 10KW Batteries be connected in Parallel?

As a general rule, only lithium-ion batteries of the same voltage and acid density with the same state of charge should be connected together in parallel. and wire cross-sections and lengths should also be exactly the same. 

In this case, the 5KW battery has a voltage of 48V, even though the 10KW battery might also be  48V. The capacity of the batteries must also be considered; as such it must be the same when connecting them in parallel. The capacity of a battery is measured in amp-hours (Ah). In this case, the 5KW battery has a capacity of 100Ah, while the 10KW battery has a capacity of 200Ah. Therefore, connecting these two batteries in parallel would create an imbalance in capacity that could damage the batteries.

If you need to connect two lithium batteries with different capacities, you can connect them in series. When connecting batteries in series, the voltage of the batteries is added together, while the capacity remains the same. In this case, for example, you would need to connect two 48V batteries in series to create a battery with a voltage of 96V and a capacity of 100Ah. Please consult the battery manual for compatibility, alternatively contact the manufacturers Technical Support for more information.

In Conclusion:

Batteries connected in parallel should be of the same type, voltage, and Ah capacities. Therefore, increasing the overall capacity of the battery storage bank. In this way, with a parallel connection of this sort, the performance and also the service life can be increased.

If a parallel connection is nevertheless made, care should be taken, as with series connection, to use lithium solar batteries of the same type, capacity, age and state of charge. In addition, the shortest possible cable runs should be used to prevent major voltage losses. 

It is important to note that connecting batteries in series or parallel should only be done by a qualified electrician. If you are not sure how to connect batteries safely, it is best to consult with a professional.

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