correct inverter cut-off voltage???

[Robert Morein]

AGM batteries, 2V/cell

State of charge can be calculated from open circuit voltage.
However, when large currents are drawn, cell voltage sags.

Is there some rule-of-thumb for a safe cutoff voltage, given that while
under load, the cell voltage is not a correct indicator of the
state-of-charge?

 

[Robert Morein]

AGM batteries, 2V/cell

State of charge can be calculated from open circuit voltage.
However, when large currents are drawn, cell voltage sags.

Is there some rule-of-thumb for a safe cutoff voltage, given that while
under load, the cell voltage is not a correct indicator of the
state-of-charge?

I have obtained the spec for this; 1.6V/cell is a typical low cutoff.

 

[Robert Morein]

At low load using batteries down to 1.6 volts per cell will do them fairly
serious harm. But of course it all depends on the battery bank capacity and
the current being drawn. The 20 hour rate test normally runs until cell
voltage falls to about 1.75. These points may help to give you some idea
about how to set yours.

Jack

Good point. Certain parts of the spec paragraph seemed to suggest that the
draw was a two or five hour rate.