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I would suggest the muffin fan too. But first do some tests.
If you have a good ammeter you can find out the wattage of your blower in different settings, and compare that to the PV cell.
The way I'd go about this is by jamming a loop wire in the fuse slot (if you want to be "safe" solder a fuse into this loop). Turn the ignition to acc or on (what ever is the minimum for turning the fan on). And test the current in the loop, and the voltage of your battery during the test. Test it at all fan speeds, and write down the findings. Then analyze with ohm's law:
I=V/R or R=V/I
P=I*V
I=amps, V= volts, R=resistance in ohms
P=power in watts
Then analyze with the voltage your PV cell puts out. If the wattage at that voltage is far greater than what you PV cell can do, then go with the muffin fan.
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