I have the Magnum auto-start and the start voltage is adjustable but only up to 12.0 or 24.0 depending on witch voltage your running.
I know 12.2 is the magic # but that is a resting voltage and so if you drag them down to 12.0 under load that is IMO just right. Depending on size of the load 11.9 could be O/K and better if it is large load like a residential fridge.
When it goes on the run time is 3 hr, preset nonadjustable. It has a quiet time override and can be programed to cycle the gen on a timed sequence instead of a low voltage start. Finally you can wire the thermostat from one of the house a/c units to it and it will auto-start when that a/c calls for cool and again, run for 3 hrs.
I got it for 159 bucks from the cruise-air guys, they have them. I later found out they undercharged me by a couple hundred dollars, I believe they are around 350. Comes with a remote.
The Liberty autostart has the ability to autostart when low shore or gen voltages become evident, this unit will not do that.
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