He adds that some suppliers, including Sungrow, now integrate DC-DC converters directly into battery containers, eliminating the need to purchase converters separately and further reducing balance-of-plant costs.
Toby Roberts, country director for developer and independent power producer (IPP) Elements Green in Australia, described the underlying distinction in simpler terms.
“DC basically are connected behind the meter before connecting into the grid,” he said, contrasting that with his own project, which uses four separate AC connection points across dual 275kV transmission lines.
Roberts added that the choice between AC and DC coupling is largely irreversible once made.
“It’s very much an early decision-making process in the design and development of a project. You can either do both, but it’s expensive, and it’s effectively a complete redo.”
