Extruded Heat Sink Profiles for String Solar Inverters

Requirement

The customer builds string inverters under 100 kW with die-cast housings and the heat sink mounted on the rear face. Their previous general-purpose profile did not match the airflow or fin height, so device temperatures ran high at full load in summer. They also have three length variants and wanted one section to cover all of them without a second die.

Our approach

We selected a dedicated heat sink section, re-laid out fin height and pitch against the housing airflow and device positions, and covered all three length variants with one die — length differences are handled at cutting. Ends are CNC-milled and deburred so the mounting face stays flat and no burr is exposed. Anodizing plus sealing suits humid outdoor cabinets.

Delivery and inspection

Ten samples after tooling for cabinet thermal and salt spray validation; production packed by length class with supports for long parts.

Project summary

One section now covers three length variants, so tooling is paid once. Cabinet testing met the design margin and end faces passed appearance inspection. New models reuse the section first.