I expect that they are designed for 120VAC, not DC at all since they are aimed at the home/domestic market.
For wattage contact them. They may give you wattage or the amps.
Either way Then you can do your own conversion.
I know several people who have used electric blankets in their boats but all required the ability to power an inverter. They often didn't need it all night, just a darn good warm up.
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