How To Connect Multiple Lithium Batteries Together In Series Or Parallel

Ensure the batteries are charged fully, and show the same voltage before connecting together - aim for a maximum difference of 0.05V between the batteries‍

• Battery voltages can be accurately checked via the TITAN Lithium app
• For optimal battery balance, you should use the first battery’s positive, and the last battery’s negative as the output

See below wiring diagrams below as examples:

Adding batteries in parallel will increase the BMS current allowance

For example, our 12V 150Ah battery can output 200A consistently, adding a second in parallel to make a 12V 300Ah bank, will increase the consistent current allowance up to 400A.

This does not happen with batteries in series; your BMS parameters will stay the same as an individual battery BMS across the battery bank.

Due to the increased operating voltage, current demands will be lower when comparing to 12V.

Please note that it is normal for individual batteries to be charged and discharged at slightly different rates while in a parallel bank.‍

If an imbalance occurs i.e. there is more than a 20% difference between batteries, please re-balance the batteries by charging them all to 100% - this can be done individually or while connected together
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BALANCING:

All batteries should be balanced (i.e. fully charged to the same level with a maximum difference of 0.05V) at least once a year to ensure optimal performance and equal wear. For heavy duty use/industrial applications, balancing should take place multiple times a year.

ADDING BATTERIES IN THE FUTURE:

You can add more batteries to an existing bank ideally within 2-3 years (depending on use) of the original bank’s installation

• To give the best performance, ideally all batteries should be of a similar age but due to how resistant LiFePO4 cells are to ageing, you can add additional batteries down the line without issue
• Should you wish to add more batteries to your existing setup that is more than 3 years old, please feel free to contact us with the cycle count of your existing battery so we may confirm if adding a new battery will be suitable

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REMEMBER:

ALL BATTERIES IN PARALLEL, SERIES OR SERIES/PARALLEL CONNECTIONS MUST BE FROM THE SAME MANUFACTURER AND MUST BE IDENTICAL IN CAPACITY AND BMS PARAMETERS.
Mixing battery sizes and makes when connected will cause wear and safety issues, plus will void your warranty.