It has been done safely using BMSs on each pack. In the case of used packs, there are issues of eddy currents between packs of different capacities but the current shunt on each pack will signal the BMS to take a pack offline if the current is too high or if the programmable HVD or LVD limits are set correctly.
I do not think it is advisable with Pb, but there are battery isolation and charging devices for RVs that use similar processes. In those cases the devices are usually only in parallel for charging.
The powerwalls are wired in parallel on the AC side. Just like any hardwired device. They can be a load or a source of current.
I do not think it is advisable with Pb, but there are battery isolation and charging devices for RVs that use similar processes. In those cases the devices are usually only in parallel for charging.
I wonder how does Tesla does it with their Powerwall units?
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