As utility-scale ground-mount and large commercial projects continue to grow, inverter topology has become one of the key decisions shaping a plant’s lifetime returns. String and central architectures each have distinct strengths — this article compares them across upfront cost, energy yield and O&M expense.
1. Upfront Cost
Central inverters typically carry a lower cost per watt than string inverters, and that advantage grows with plant size. However, string inverters eliminate the need for DC combiner boxes, so the total balance-of-system cost gap narrows as site complexity increases.
On sites with complex terrain or phased construction, string inverters often come out ahead on total cost despite a higher per-watt price.
2. Energy Yield & MPPT Tracking
String inverters typically carry 6-12 independent MPPT channels, tracking power more precisely under partial shading — a real-world yield gain of roughly 2-4%.
Conclusion
Lumasun Power manufactures both topologies and can help size the right solution for your project.