Of course. The only way to really determine state of charge is to monitor battery current as well as voltage to integrate the total charge put into the battery from a known state. So, my question is still this: in a mulit-battery system connected either in series (like I proposed here) or in parallel, which is the more likely scenario with batts rated at the nominal Growatt voltage (24, 48v) ,how does a single Growatt communicate with *both* batteries and adjust charging voltage and current from the Growatts charge controller? .
Even if the serial port allows communication with multiple batteries (I think it should work with multiple devices being a serial interface), then the Growatt still has to treat both batteries as a *single* source and adjust charging for the battery bank as a whole, yes? I view a multi-battery bank connected to a single Growatt as similar to individual cells in a LFP battery. However, in a LFP battery bank with a BMS monitoring and adjusting charge on each individual cell, the Growatt doesn't charge and balance each individual battery in the bank, but charges batteries in the bank, whether in parallel, in series, or both, as a single battery.
So, how much importance does the communication feature really affect performance and battery life since the Growatt is not charging individual batteries, but the bank as a whole?
