120v 'power' thru the inverter is not impacted, it is either ON or it's NOT on, it doesn't waiver in power supply.
When the batteries reach a critical low voltage state, though, the inverter WILL notify or alert you that enough voltage is not available to continue, usually with a red light, and sometimes also an audible beeping, and will shut itself down.
to minimize depletion of the batteries to a very low charge, use the LBCO(LowBatteryCutOff) setting... which tells the inverter when YOU want it to shut down power - such as at 11.0volts.
I use our LBCO setting so that we are alerted to a potential failure of the AGS(AutomaticGenertorStarter), to start and recharge the batteries, as that the batteries have fallen to a critical low level. I don't want the issue of the batteries dropping too low for me to then not be able to start the Generator manually.
It's like a back-up to the back-up.
- if you have shore power, and it is lost, such as during a storm, your inverter will take over and use the battery power/voltage to continue supplying power to your 120v items.
- if your AGS is enabled, and set to start at a certain low battery voltage, such as 12.0v, then it will kick on and start recharging the batteries, thru the Charger, if the shore power is not restored.
- if the AGS is not set up, or is not able to fire up the generator, then the LBCO will cut off the inverter, to preserve the batteries if they have reached a critically low voltage, potentially saving you from dead batteries, though your fridge will suffer if power is not eventually restored.
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