Anyone tried combing 2 or more BMS in series or Parallel?

Hi, just wanna do some DIY project.
Am planning to use LiFePo4 3.2v 5ah 32650 batteries.

Design would be combining 5 batteries in parallel to make a 25 ah bank, then 4 series to complete a 12v 25 ah battery bank with a 4s BMS. My concern is, can i make another same 25 ah battery bank with its own 4s BMS and combine the two in series to produce 24v 25 ah system or in parallel to make a 12v 50ah. Anyone tried making one?

4S5P with identical cells?

4S5P with a 4S BMS in series with another identical for 24V is fine. This is basically what you're doing when you string two Battleborns in series.

Since you're building your own, why not make a 8S5P and use an 8S BMS for 24V?

Or 4S10P and use a single 4S BMS for 12V?

snoobler said:

4S5P with identical cells?

4S5P with a 4S BMS in series with another identical for 24V is fine. This is basically what you're doing when you string two Battleborns in series.

Since you're building your own, why not make a 8S5P and use an 8S BMS for 24V?

Or 4S10P and use a single 4S BMS for 12V?

Click to expand...

Hi, thanks for the advice
Am new with LiFePo4 batteries, hence wanna start slow. instead of using the 32650 batteries, i just bought 4 pcs of 3.2v 90ah Sinopoly LiFePo4 battery with Deligreen 4s BMS 30ah discharge/15 amp charge and hook it to victron 100/20 mppt smat solar (will cap max charge to 15amp). Will be using this mainly for my aquaponics system (water pump, 12v; 18 watts, so less than 2 amp usage, 24/7).
If the outcome is good i plan to make another same system and hook both BMS to make 24v (will use a Dc-Dc step 24v-->12v so i can use my pump, and add some grow lights).
Planning to phase out the Lead acid battery.