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Lets say I have an APC Smart UPS SMX750 which is $310 with shipping and tax. It is designed for 48 volt battery packs (can you guess where I'm going with this). The APC battery packs are lead acid batteries, (2) parallel strings of (4) 12v 9a SLA batteries in series (48v 9a x2) per pack...

Let's say I have a 6000XP supplying a critical load panel. Grid AC power and a portable generator input also connected. Using as a UPS, no solar involved. I can't find any documentation on how it operates as an ATS between grid and gen inputs. Are the inputs interlocked when not in AC...

What dictates when/if the EG4 6000 is sending generator or grid power to the charger only vs bypassed straight to the load? I see the manual lists these modes. But I don't see how it decides what to do.

How quiet (or loud) is an EG4 3000EHV with no PV and only batteries? Would be supporting a critical load subpanel with only 1 or 2 rack batteries as a UPS. So for 98% of the time, it would be on grid power with fully charged batteries standing by. In a grid outage, the batteries would supply...