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the easiest thing is to run a test yourself.
Get a inline amp meter and run everything that your going to power off it FLAT OUT. as much as you can draw current wise (amps)
take that number and do some simple calculations
Never run your SLA battery below 20% its just not good.
so 26 a-h - 20% is your theoretical amount of power
take your max current draw number you measured before.
26 divided by actual amps drawn. this will give you an approximation of how many hours it will last.
just some back ground info
Ah's means amps per hour
that means you can draw 26 amps for 1 hour or 1 amp for 26 hours.
hope that helps you out
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