12.3V measured with the battery at rest for 24 hours is generally considered to be 50% discharged. 12.9V is generally considered to be 100% charged. (You might find disagreements of a tenth of a volt here and there as to the charge state.)
Since it isn't easy/practical to measure the voltage with the battery at rest, you need to make an educated guess about your battery state unless you check the charge state with a hydrometer.
We have our Auto Gen Start programmed to start the genny when it detects battery voltage at 11.5 volts for one minute (or whatever the time is - I forgot.)
Like the other have suggested, I also think 10.5V is too low a cut-off voltage. Try 11.5V or a little higher until you gain some "feel" for your batteries.
For best battery life, try not to ever discharge your batteries below 50%.
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--John
2005 Horizon 40AD, 2005 Jeep Liberty CRD
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