One more thing to worry about: doubling the battery capacity in amp-hours or 
equivalent won't necessarily double the endurance time, particularly at light 
loads.  I think (but IANAEE) this is due to conversion overhead, etc., that has 
a significant fixed component.  Spec your system for endurance at a given load, 
not just in batteries, or you'll be sorry.

As for lead-acid, you may also be looking for so-called deep-cycle batteries. 
(Not sure how AGM fits into this.)  Some ham radio repeaters and other similar 
stations use these for emergency-power systems, those with solar input, etc., 
where the expectation is occasional, but extended, outages, not merely hiccups, 
and no gen-sets on the mountaintop.
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