Ask HN: What % of equity is a technical co-founder worth?

At this point I own the idea(worth=$0) and 100% equity. And without a technical partner I have no beta product. He's open to the idea of equity in the company.

I'm a business-minded, action-oriented guy. I feel I'm good at team building, marketing, selling, partnerships & strategy. The real business side of things.

He knows the technical side. What is fair 15%? 45%?