Thanks Shawn. Yes, good to keep things as simple as possible. The complexity argument cuts both ways though, in this instance, because a failure of the BMS when you are using only one, can leave you dead in the water, whereas a single BMS out of 4 failing, and everything might be able to carry on happily while the defective one is replaced? Same consideration for protecting the batteries from damage: if a low or high temperature cutoff or voltage cutoff fails, you can have all of your cells damaged, or just one quarter of them. Over a period of 10-15 years, the odds of this becoming more than a hypothetical are something worth some pause?No. It’s my understanding that if you get the correct BMS for your application, one BMS can control a 1, 2p, 3p or 4p16s battery bank.
That’s why I’m looking at Batrium or Orion.
However, also keep in mind depending on the inverter you have, a BMS is not required, but is highly recommended.
Can it be done the way you described above? Yes it could, but that’s added expense, and the more items you have that are electronic, the more opportunity for you to have issues. Over complication.