Often road bike wheels are "guaranteed" for riders up to 170 lbs. That's not even a big guy. I don't know what sort of bike exactly your husband is riding, and what wheels he has, but it's very likely that he would need sturdier wheels. DebW will give us better info, I hope, but I don't think it's only about the spokes. If there's torsion in the wheel, then no wonder that's going to break spokes. Unclipping on the inside shouldn't make that big of a difference.

Or: the wheel hasn't been built properly to begin with. (Not unlikely.) Starting over might be a better idea...