If you want a two speed, which I would highly recommend, you would need to go with the SP2707X102 which is a 1 HP up rated pump (equivalent to a 3/4 HP full rated). The 3/4 HP up rated single speed would probably be big enough as well but the low speed is nice to have when not running solar. Also, the single speeds can be wired for either voltage while the two speeds are 230v.