I have a similar setup, 2 Renogy 100W panels and a Blue Sky SB2512 mppt controller. You may want to consider wiring in parallel rather than series - if series, and a shadow falls on one part of one panel, it effectively kills the whole array. In parallel, a shadow on one part of one panel will kill that panel, but the other will still supply current. The advantage of series is a bit lower loss in the wiring, and some very modest charging at low light levels. To me those are not enough to overcome the former disadvantage. If you live in an area without shadows, then series by all means :).