He means the max current on a 15A breaker. You're right there with a 13,500 BTU/hr A/C unit.
You gained back 5v of drop. At 15 amperes, that's 75 watts of power that used to be wasted making that cable nice and warm. Actually, you got back a little more than that, because, when the voltage is too low, most motors (other than series-wound motors) will draw increased current. You've got two motors in the A/C. Without knowing for sure, I'd guess the compressor has a capacitor-start induction-run compound motor and the fan has a self-starting induction motor. Each motor will draw increased current (and run slower and hotter!) when the voltage is low. Sometimes they'll run so hot they melt, which is expensive. But 108v wouldn't be low enough to kill them that way.
I'd measure, also, at the outlet where you plug in the extension cord at the house. If you're dropping 8v (121-113=8), that's still a lot.
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-- Carl
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