ACTOM has introduced a new inverter-integrated transformer skid for utility-scale solar photovoltaic (PV) plants, offering a locally manufactured plug-and-play alternative to fragmented component sourcing in the South African market.
The pre-assembled skid, which was launched at Enlit Africa 2025 this week, includes a Sungrow inverter, ACTOM-built transformer, low-voltage combiner box and a medium-voltage ring main unit (RMU). All components are factory-assembled and tested at ACTOM’s local facility to ensure compatibility and simplify deployment.
“This innovation brings global technology and local manufacturing together to accelerate clean energy adoption while building South African skills and industrial capacity,” Lee Mbenge, Divisional CEO of ACTOM Distribution Transformers, told Energize.
In the system, the inverter converts DC from solar panels into AC while the transformer increases the voltage for grid compatibility.
Traditionally, solar developers source and integrate multiple components independently, which can cause delays and compatibility issues and require after-sales support from various suppliers, Mbenge said. “Our solution resolves these inefficiencies by offering a unified, factory-tested system that is easily connected on site with ACTOM as the single point of contact for support.
“ACTOM’s transformer is specifically engineered to handle the high harmonic content produced by inverters, addressing a major cause of transformer failures at renewable energy sites globally due to poor inverter coupling. Our design anticipates these challenges, mitigating the risk of premature failure.”
Although optimised for solar PV, the unit can also support battery energy storage systems, off-grid applications and grid stabilisation during peak demand or load shedding events.
The modular system is also scalable. ACTOM is currently manufacturing a 4,4 MW unit with an 8,8 MW version in development. “A solar plant targeting 150 MW, for instance, could tie multiple units together to reach desired capacity,” Mbenge said. Each unit is custom-built to order with a typical lead time of about four months and options for voltage level, power, fluid type (mineral oil or ester fluid) and RMU brand.
Sungrow has placed an order for two units for a project with ENGIE, marking the first commercial deployment. Mbenge said ACTOM is also investing in local technical skills to support system deployment, long-term maintenance and future developments.
“This technology provides a scalable pathway to expand Africa’s renewable energy footprint and is a practical solution with the potential to redefine how we power the continent,” Mbenge said.
