sentences:  The downside to these design changes is cost; both the materials and construction methods are more expensive and thereby drive up the price of the panels.However, the price of the panel is not the only input to a solar power system's total cost, and in recent years it accounts for much less than half of the total.In this case, using a more expensive panel can actually produce a lower overall system cost if savings can be found in installation time or there are artificial limits on system size.