Just a feeling, mostly, that you are directly converting 120V AC amps to 12V DC amps, directly. They are not the same.
And AC is not at all like DC. (making it pretty much not possible)
And a loaded pump that operates at (ie:) 1A will not start with 1A, so a 17W 12V solar panel will not start a 12V 12W pump with a load.
And, And, And...
If your plan runs close enough to bother calculating them, then it will not work in any reasonable fashion.
Facts Suck, but facts are facts. Sorry.
The pump in the link is AC. If the plan is to run it with RE, then I strongly suggest looking into DC powered pumps, because the complete system will probably be cheaper. A LOT cheaper.
I can not focus on all that blabbering ebay text, but I did try! I see nothing that gives any relevant info.
Might want to look into an item called a DC-8, 15, 20, or 40.
This is not an endorsement, but a site that has decent info on a decent DC air pump.http://www.dynamicaqua.com/aeration.html
Combine that info with air lift pump info, and you can aerate a decent sized pond with very little power.
(remember the vast majority of aeration occurs at the surface naturally, so you only need to move un-aerated water to the surface and let nature take its course)
If a fine bubble circular aeration stone is installed in a 4" pipe, a few feet down (2~4?) the pipe, and the pipe goes down to within a few feet of the bottom, then a little bit of air moves a lot of un-aerated water from near the bottom to the surface, with almost 0 of head.
"10 feet high dam that could be a very cool micro-hydro turbine site, but its too far from the pond I need to aerate."
Never underestimate the potential of 10 of hydro 24/7.
"Too Far" is related to cost for suitable wire, and for you "Too Far" is related to everything else.