The 120 AH isn't going to run much stuff very long.
That's about the same watt hours as a pair of golf cart batteries.
With a 600W load, that's about 25A. That's about an hour and a half.
SLAs won't last long with that kind of abuse.
I am not sure they will supply 3000W (125A) without the inverter going LVD.
A 3000W pure sine inverter waiting for a load might drain the batteries before morning.
Some units have a "sleep" function. They wait for a load before turning on. Not sure how that fits with the fridge.
I don't get the "function as either a UPS or full time unit".
The plan is to run it 24/7, even when the grid is on?
That's a lot of wasted power, like noticably jump the bill kind of wasted power.
The 24V and pure sine limits the choices.
G-
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