Is it possible to choose a larger BMS than you need for BMS configuration change?

I have some questions about BMS and battery configuration. As far as I know, if you want to create a 12-volt battery, you need a 4s BMS, a 24-volt battery requires an 8s BMS, and a 48-volt battery requires a 16s BMS. Is this correct? If I want to change my 4 batteries to a 4s/4p configuration, do I still need a 4s BMS? If I decide to change it into a 24-volt system in the future, would it be possible to purchase an 8s BMS and disregard the last 4 wires? Or do you have to buy a new BMS every time you make a battery configuration change (which can quickly become expensive), or increase battery capacity/voltage? Also, what is the 7s configuration?
  1. You can choose a larger BMS than you actually need in order to make battery BMS configuration changes in the future without having to change the BMS as often. Typically, if your battery voltage is 12 volts, you’ll need a 4S BMS; If it’s 24 volts, you need an 8S BMS; A 16S BMS is required for 48 volts.
  2. If you change from a 4-cell battery to a 4s/4p configuration, you will still need a 4s BMS. This is because these parallel groups are usually treated as a single battery in the BMS configuration.
  3. If you plan to convert your battery system to 24 volts at a later date, you have the option of purchasing an 8s BMS but can choose not to use the last 4 wires of the BMS. You can then reconfigure the BMS for a higher voltage system later if needed. This is a viable method.
  4. 7S configurations are not applicable to Lithium Iron Phosphate (LFP) batteries, each Li-ion type has a different voltage. 4S, 8S, and 16S are applicable to Li-ion batteries. Some BMS can allow 4S, 8S, and 16S configurations, such as the MOKOEnergy BMS with an active equalizer. However, in the case of 4S, an external power source is necessary.

MORE: Can I connect 5V DC power from a USB power supply to a BMS that originally had a 3.7V battery connected to it?

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