I am late to the party.
It sounds to me like the windmill is charging as it should.
It sounds like the load is too much. And the battery may be ruined from the first go around.
The wind speed for 16V open would make about 200ma, if what I think is correct is correct.
Double that wind speed would be about 3.3A. And that is only about double the drain current. The load is increased, so the blades are running at a lower TSR, so the frontal force from the wind is greater (my basic understanding) and the blades will be bending back. If the blades bend back enough, the tips go negative and the RPM sort of self-limits the RPMs. If the blades self-limit the RPMs, the RPMs and current will not go up as expected. My PVC blades seem to self limit RPMs somewhat, even before the blades flex back.
Same idea? The wife's 4-popper Camry runs 2200RPM at ~70MPH (113KPH). Tach shows red line at 6300RPM. That doesn't mean it goes 200MPH (355KPH). Speedometer only goes to 140MPH (225KPH) as a hint.
Catch-22. If the battery is TOO low the blades will stall, the RPM and current are low, the battery goes dead in hurricane Ike.
An extra low battery takes a LOT more AH in than it put out to get back up to snuff (just a personal observation not related to a calculator).
The 110AH battery with a 1.3A load is flat at 84 hours (3.5 days). The extra 10 days fried the battery is my bet.
Even if the flat 12.0V battery was unloaded and the charge was 3.3A, it would take a day and a half to get the battery back up, if the battery was not loaded with the radio stuff. With the load would take over 2 days.
The error in thinking may be the "2 weeks (336 hours) with a full 110AH battery"?
The current draw for the time-frame would be less than 1/3A, or about 4W average. The battery was most probably being ruined during that time, and any numbers from after that time are way off normal, IMHO.
A standing 12V battery should not be able to read under about 10.7V unless it has a "dead cell". Hillbilly Windage applies.
It was a $10 motor. The info you started with was bogus or misleading or misunderstood.
The major malfunction I see in this entire mess is SOMEONE read what I posted,
http://www.fieldlines.com/story/2005/1/25/144635/825
bought about 4000 motors Surplus Center couldn't sell for many years at $10, (yea, I keep old catalogs),
but using Norm's and other people's output info,
Zubbly's and Woof's PVC blade info,
and he gets to make over $100K profit in a short time.
Yet he STILL manages to ask people to "Donate" to his commercial website.
I can almost see it now,
"Sam Walton passed today.
Donations to help his family pay his final expenses can be sent in the form of a check of money order to your local Wal-Mart. It is expensive and they appreciate your support. Thank you, and buy more stuff from us.
In return for a donation you get google hit links.
And about every year, or year and a half, I'll chime in with something useless to maintain my book sales."
But it could simply be my take on it.
G-