Cordless Drill/Driver Question

Hi,

I recently got a new tent and the manufacturer recommends
securing it to asphalt by the "drilling really big screws into
the ground with a power driver " method. Sometimes you can do
it…sometimes you can’t. I was wondering what kind of power you
would have to have in your drill to do something like that?

Reading the ads this Sunday I see 9.6 through 14.4 volt
models…with widely varying prices. Any help?

Karen