I asked the same question when I was coding the warning system. As always in amateur radio, it depends.
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My SLA batteries fully charged give me 12.7v. Setting the lower limits to 11.7 and 11.5 would probably work. Tweak the upper limits to 12.8 and 13.0
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However if you want to run it with a conventional power supply of 13.8v then the upper limit numbers mentioned above would not work. Here 13.9 and 14.0 is not out of reason.
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In the end I just pulled numbers out of my aft end and let the end user decide what limits are appropriate for his rig, situation, and usage.
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Till later
Hank K5HDE
