I dont think there is a trustworthy low voltage number. The reason is that starting your microwave will cause voltage to drop to 11.0 or below for a while. A battery under load cannot be measured. It must be at rest and proper temp before it can be measured.
The only safe way is to install a BMK. I have documented the installation. The bmk is a fuel gauge type indicator for your batteries. It is the only accurate way to know your battery usage and remaining life.
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