By: Dr Andrew Dickson - engineering executive at CBi-electric: low voltage

In the wake of South Africa’s longest uninterrupted period without load shedding, the rooftop solar market has experienced a slowdown, with the South African Photovoltaic Industry Association (SAPVIA) reporting a 60-80% decline in project volumes between 2023 and 2024. However, as 2025 progresses, interest in solar energy installations is expected to rebound.

This is according to Dr Andrew Dickson, engineering executive at CBi-electric: low voltage, who explains that several factors are set to drive the growing uptake of solar energy over the coming year. “These include Eskom’s proposed tariff increase, the unreliability of aging electricity infrastructure, and the oversupply of solar technology in South Africa driving prices down.”

He points out that while the Enhanced Renewable Energy Tax Incentive will no longer be available to businesses after 28 February 2025, organisations facing a 36.15% increase in their electricity costs must consider whether they can afford to overlook the benefits of going solar. “GreenCape, for example, estimates that solar PV can cut energy costs by 15%, with a return on investment achieved in three to 12 years and up to 15 years of free energy thereafter.”

“With inflation projected to ease to 4.5% in 2025, and solar technology prices dropping, this makes for a highly cost-effective investment opportunity, “adds Dr Dickson.

Safeguarding solar investments 

He stresses that businesses need to take proactive steps to protect their solar systems, extending its lifespan and ensuring long-term efficiency.

“Voltage spikes caused by electrical disturbances such as lightning or grid fluctuations pose a significant risk to solar PV systems. Installing surge protection devices (SPDs) is crucial to shield inverters and batteries from these threats. Without adequate surge protection, businesses may be left with expensive repair costs, as warranties could be voided,” warns Dr Dickson.

Another critical concern is the vulnerability of solar PV systems to arcing, where electrical currents jump across gaps, generating intense heat and light that can cause serious damage. To mitigate this, he recommends using DC circuit breakers specifically designed for solar systems. “These breakers are engineered to handle the direct current generated by solar panels, ensuring safe and reliable system operation.”

Dr Dickson notes that smart technologies also play a pivotal role in managing solar investments effectively. “A smart power indicator, for example, can send alerts about grid power interruptions, allowing for speedy responses. By temporarily disconnecting non-essential high-energy devices during outages, businesses can avoid system overload and preserve battery life. At the same time, by automating critical systems like lighting and security to turn on, it ensures that critical infrastructure remains operational even when mains power is down.”

Optimising solar ROI in 2025

He highlights that careful system management is key to unlocking solar’s full potential. “By leveraging tools like a smart power indicator and surge protection devices, businesses can avoid unnecessary expenses and ensure uninterrupted operations.”

“As the solar energy market gears up for a resurgence in 2025, organisations have a unique opportunity to benefit from its growing potential. With the right precautions in place, solar energy can deliver the long-term value that businesses seek,” concludes Dr Dickson.