Battery Voltage [solved]

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ok , im trying determine cutoff point 12v battery (automotive) . im going use arduino shut off relays nothing else draw current untill system charged enough solar panels again. many web sites kinda vague.
they tell me dead battery 10.5v .thats not helpful, battery take damage @ kinda discharge.
so anyway :) thoughts/suggestions appreciated :)

12.8 100%, id 12.2 pretty low, 11.8 should kill power think that's 10-15% left , lower bad, assuming deep cycle battery, if regular auto battery(designed more cranking amps) may not wanna go below 12.2


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