yes you would have to rectify it. but your looking to charge a battery pack of 48 - 50vdc? to get that voltage that you need its not that easy.
you will need at about 58-60vdc and between 20-30 amps.
I would leave it 120 and install a battery charger
I know in my job i work with battery chargers. I know sens makes a 120vac input 24vdc @10 amp output charger thats a reasonable price. or Charles is another company.
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