No flaming sir but listing the power draw on the unit's sticker eliminates the need for a person who wishes to help to go on a web Easter egg hunt to track it down.
Help us to help you...at your service...
An OEM PDF download says to use 10 gauge wire for distances to 20'
21' or greater I would use 8 gauge. Nothing is as nasty as fixing a clogged macerator because of a weakened motor.
It's not just the time to pump "water" maceration is slower, then a clear water flush is desired. No twenty dollar booster jumper pack or cigarette lighter connection will survive that.
Helping folks IS my hobby thank you very much...