Bob S - There is a low voltage warning light on the Charge Controller, but not a shut off. I do have a 1000w sine wave generator that I can use to charge the battery should that light come on (& a 7500w B&S generator - seen in picture - if I need more power).

CAP613 - I have not checked to see if there is much voltage drop with the 10 guage wire. In describing my set up with the folks at Pacific Renewables Group, their recommendation was to use 10 Guage wire. So far, as soon as any light hits the panel the green 'charging' light comes on the controller, so I am guessing that the drop is minimal - but I will check just to be sure. The storage room has very open ventilation (you can see day light above the battery), so I left the battery open with the expectation that any gassing would be quickly dispursed rather than contain it.