Looking into getting a back up power inverter. But I am very confused on the semi modified / modified sine and the pure sine. I get it that pure sine is what I get from the power company. Will the modified sine run my house? Or will It only run certain things. I see a stackable semi modified sine inverter from sun that looks cool. You can start with just one unit and add more and they will act as one. http://www.ebay.com/itm/2500W-5000W-Stackable-Power-Inverter-48V-DC-TO-230V-AC-/350525811185?pt=LH_DefaultDomain_0&hash=item519cf769f1 Does anyone have these? My plan is to start small and work up to being able to power my whole house.