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Understood now, that makes sense. I want to stick with APC for the UPS. Maybe what I need is a big ass 48v SLA battery?

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.

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...

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...

Honestly I don't know. But I assume nearly full since it's designed for SLA batteries. Not a good idea how?

I like. Since I'm not powering the house, I don't mind value engineering to a budget friendly battery, as long as it is safe and respected for what it is. Which looks to be the case.

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...

The reason I want to stick with APC is due to the network communication. My desktops, servers, Home Assistant, Raspberry Pis, and PFsense firewall can all communicate with APC using the apcupsd. I have everything configured to stage safe shutdowns in inverse order of priority. And I get push...

I need more than just a single indicator from contact closure. APCUPSD tells me line voltage, status, SOC, estimated run time, etc. I can set my devices to shutdown based on different runtimes. Non critical devices go first. Then servers at the last few minutes. If this was battery backup for...

Ah ha, I wasn't connecting the dots that it was the same single piece of internal hardware, not an inverter and a separate charger under the hood. So with a 50amp grid input, it can use up to 25 amps of that for charging, leaving a minimum of 25 amps to load. Which matches the 25 amp inverter...

I use Home Assistant to send me push notifications with data from the UPS (outage, run time, etc). All the various inverters and AIOs have with no way to connect to convoluted complex schemes. Then I'd need to make various automations to shutdown some of my stuff. It is not practical.