Hey @crypto.scott, you need at minimu 800 SP, and here are the various ranks. If you have more SP you get more upvote power.
800-1300 SP gets you a 5% upvote once every 24 hours
1301-10,300 gets you a 10% upvote once every 24 hours
10,301-20,300 gets you a 20% upvote once every 24 hours. and so on...
I am a part of the trail and it does well for me, and I dont have to upvote myself so much.