An update.
LG ESS is simply not compatible with the SMA represented system of SMA storage inverter, Automatic Backup Unit, and its SMA PV inverter. Just cannot AC Couple and use solar to recharge the batteries because as soon as the battery changes from charging to discharging, it bleeds off voltage in its DC to DC converter and that causes the storage inverter to drop.and that causes the PV inverter to drop.then it starts anew. SMA makes reference to this obliquely in it "background knowledge" documentation but even that asterisked verbiage doesn't drive home the point that one just cannot AC couple the PV inverter to gain solar charging. And of course if that's the case, why the heck would one even couple via a "whole house backup" SMA Automatic Backup Unit??? The answer if course one would not. Supposedly the BYD battery which is a true 400V battery and does not have the DC to DC converter does not have the same power lapses and will work in this architecture. Let's see how SMA fixes this with their documentation representing this would all work.
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