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Electric motor for turning automatic blind? - automatic blinds

I build an automatic outdoor roll-up blind. An iron pipe 11 feet in one piece is 11x6 foot injury wrinkles. I need an electric motor even more power. Should be essentially a low speed and high torque, totally reversible. I was thinking of getting a current 12 V low price for the winch. I know that we again set in pairs, but the weather was good, speed and reversible. Other ideas? Any idea how financially from 110 to 12V? How many watts do I pay a transformer to a 12V battery together?