6 FAQs about Mainstream inverter power on the field

Are central inverters better than string inverter?

Fewer equipment areas: Developers will inherently need fewer central inverters than string inverters for the same overall project capacity, leaving more space for the PV array and less for inverters and balance of system components. Lower perceived risk: Central inverters are more mature than string inverters.

What are the different types of PV inverters?

There are three primary tiers of PV inverters: microinverters, string inverters, and central inverters. Since microinverters are not rated for utility-scale voltages, we will largely ignore them in this article. String inverters convert DC power from “strings” of PV modules to AC and are designed to be modular and scalable.

What is a central inverter?

The inputs to central inverters are most often combined dc circuits from many (or all) strings in the array that feed a small number of integrated MPPTs. The likelihood of encountering a central inverter on a project increases with project size and age. Utility-scale projects above ~10 MW are the most common application today.

Will my project have a central inverter?

The likelihood of encountering a central inverter on a project increases with project size and age. Utility-scale projects above ~10 MW are the most common application today. Large C&I and smaller utility-scale projects from just a few years ago are likely to have central inverters as well, for reasons we'll touch on in the next section.

Why are central inverters so popular?

Some of the reasons for central-inverter dominance at larger scales are as follows: Lower capital expenditure (CAPEX): While string inverter costs have come down, central inverters are usually cheaper upfront (in dollars-per-watt). Contact your inverter manufacturer for the latest pricing estimates.

What is a modular string inverter?

Flexible system design: Modular string inverters open many doors for system layouts. Inverters can be distributed at the end of array rows, clustered in “virtual central” arrangements, co-located near the point of interconnection, and anything in between. Increased energy harvest: String inverters with multiple MPPTs will produce more power.

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