Wiring in parallel or series?

When using lithium-ion batteries in a system, one important consideration is whether to connect them in parallel or in series. The choice can have a significant impact on the overall performance of the system, including the amount of available energy (amp-hours).

Connecting batteries in parallel increases the total capacity of the system, while maintaining the same voltage. This means that the system will be able to store more energy and deliver it over a longer period of time. For example, if you have two 12V lithium-ion batteries with a capacity of 10 amp-hours each, connecting them in parallel will give you a total capacity of 20 amp-hours while still maintaining 12V.

On the other hand, connecting batteries in series increases the total voltage of the system, while maintaining the same capacity. This means that the system will be able to deliver more power, but for a shorter period of time. For example, if you have two 12V lithium-ion batteries with a capacity of 10 amp-hours each, connecting them in series will give you a total voltage of 24 volts, but the same capacity of 10 amp-hours. Below is an illustration showing the difference between series and parallel wiring. 

So, which is the best choice for your system? It depends on your specific needs. Some applications like powering fish finders or starting motors need only 12V. In this case, one 12V battery would suffice or you can run two 12V in parallel to have more power while still being in the right voltage range. Other applications like trolling motors need more power, up to 36 volts in some cases. In this case, you would need to run three individual 12V batteries in series just to get the power required to run the trolling motor. Or, with 36V lithium batteries you could run one individually or have two in parallel to get more power while maintaining the 36V required. 

It's also worth noting that connecting batteries in series or parallel can have other impacts on the system. For example, if one battery in a series connection fails, it can bring down the entire system. On the other hand, if one battery in a parallel connection fails, the system will continue to operate, but with reduced capacity.

In conclusion, the choice between parallel and series connections for lithium-ion batteries can have a significant impact on the overall performance of the system, including the available energy (amp-hours). Careful consideration of your specific needs and the potential impacts of each choice is important for ensuring that your system operates effectively. If you have any questions about what batteries you need, take the quiz on our homepage here or contact us with any questions at sales@litihiumbatterysource.com