Low voltage shutdown alternatives

[BerndL]

Most standalone inverters have low voltage shutdowns that are far too low for lithium batts, as low as 9V on a 12V inverter! (Giandel says 9.5+/-5)

What options are there to use low capacity cutoff signal from a shunt? Are there relays that can either cut off power to the inverter or (better) turn off with the inverter's own remote switch?
Alternatively, are there any non-AiO inverters that have adjustable cutoffs or built-in shunts?

I'm building up from a 24v milk crate system. Not sure if I should add a 2kw giandel inverter and a diy control system, or if there's a more expensive but plug and play option.

 

[Glock24]

I have a BMV-700 that has a configurable relay, I imagine other shunts do too, so you could wire this to the inverter's remote on/off switch.

Morningstar has off-grid invertersfrom 150W to 2500W that have configurable cut-off voltage:

 

[meetyg]

I hacked the remote display of my FCHAO inverter, basically extending the terminals of the ON/OFF button, connected to a voltage sensing relay.

This voltage sensing relay is connected to the battery and can be set to trigger (open) and return (close) at set voltages.

It works great. The only one caveat is that under high loads, there is a slight voltage sag, so the voltage measurement isn't 100% accurate. But it will just cut-out early, so it's not that much of a problem in my opinion. If you regularly run highbloads, you could set the low voltage cutoff to slightly lower to compensate for this.

 

[Backyard]

This will do what the previous poster talked about for a low voltage detector relay


This one looks to have a timer so you can adjust it to not trip right away with heavy surges and voltage sags