Can't you just alternate between sets of cells with sufficient excess capacity then? They don't all need to be in lockstep at the same phase of their charge:di

Can't you just alternate between sets of cells with sufficient excess capacity then? They don't all need to be in lockstep at the same phase of their charge:discharge cycles if it takes so long. Perhaps that becomes cost prohibitive even with the low cost of lead-acid, I've never attempted this. It just appears obvious from a high level that excess capacity can overcome all these limitations.