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Case Study
Hillaldam
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Location
Gauteng
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System size
184.5 kWp DC + battery
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technology
Solar PV + battery
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Industry
Manufacturing
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The challenge
Every successful project begins with a clear understanding of the client’s operational environment, energy requirements, and long-term business objectives.
Hillaldam’s CNC machinery cannot tolerate power interruptions. Even a brief outage risks equipment damage and costly downtime. Rising Eskom costs on the Miniflex tariff were a growing burden, with annual grid spend of around R770,000 before solar.
The CNC section has high inrush currents – load data showed a 64 kW spike lasting one second – and the factory runs six days a week from early morning. Expansion of the CNC section was already planned, so the solution had to be future-proof from day one.
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Our solution
Working closely with the client, our team designed a solution that balanced engineering excellence, financial viability, and long-term operational performance.
Nesa Power specified the Sigenergy SigenStor platform for its zero-millisecond changeover, which is critical for CNC protection. Only the CNC section was treated as an essential load, so the battery could be right-sized instead of protecting the whole site.
The BESS is sized for about two hours of CNC outages per day, reducing generator dependency. An over-panelling ratio of 1.6 (above the typical 1.4) maximises yield through the inverters. The Sigen commercial gateway architecture allows extra inverter blocks and battery stacks later with minimal install cost.
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Gallery
Project Gallery
Explore selected images showcasing the completed installation, engineering quality, and project delivery.
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Looking ahead
Planning your own energy project?
Every business has unique energy requirements. Speak to our team to explore a solution designed around your operational and financial goals.
