Ideas like this one make me wonder. Couldn’t you just get any external battery device that has an AC outlet? Or, even better… something like this that has multiple purposes and cost about 5x less?
Either way, Sanho’s HyperMac is basically an external battery pack marketed toward the MacBook crowd. The HyperMac will power the MacBook Pro for 32 hours straight. Yours for about $500 coming in about a month.