If one inverter breaks down, I have 4 others still running power lines to the house. Notice the weight of the single one verses the weight of the 5 others is the same, meaning the inductance is the same, but the prices are different. Why is that? Supply and Demand I suspect. It’s cheaper to purchase 1200VA and 800VA because millions of people purchase them, whereas only few people purchase a big 5000VA Inverter.