Wawa:
You have been told otherwise in your other thread.
Read reply #7 here.These modules need 5volt, so how are you going to reduce that 12volt to 5volt.
Linear regulation to convert 12volt/10Amp to 5volt/10Amp would dissipate 70watt (big/hot heatsink).
A switching buck converter would be another module.
Maybe easier to use a 5volt/10Amp supply.
Leo..
I understand that, but the wiki says that you need 9 to 12V to power up arduino.