Solar Safety
Traditional string inverters typically have limited safety functionality since they do not necessarily reduce the DC voltage when switched off. To meet safety standards, additional hardware may need to be purchased, adding more cost and labour to the installation.
Due to this and other limitations, we have seen a notable shift away from traditional string inverters in favour of more advanced systems that
leverage DC-optimisation. These systems split
the functionality of a traditional string inverter and use Power Optimizers placed directly onto panels to monitor performance in real time. This not only increases energy production and provides more flexibility in system design and layout, but it also improves safety through embedded safety features that are capable of identifying and mitigating faults at a panel level.
There are two safety features in particular to look out for when choosing an inverter. The first is SafeDC. This is a module-level safeguard which automatically reduces the output voltage of solar arrays to a touch-safe level to provide safe roof access to firefighters and maintenance teams.
The second is arc fault detection and prevention. Although rare, arc faults can be triggered by issues like false trips or loose connections and may result in heat build-up that, if undetected, could cause an arc fault to develop. DC-optimised systems monitor terminal blocks for abnormal heat buildup, quickly identifying the source and isolating it to prevent escalation.
Digital Defences:
Safeguarding Solar From Cyber Threats It is a sign of the times that solar safety concerns now extend beyond fire hazards to include cybersecurity. Recent high-profile cyberattacks on companies like HMRC and Marks & Spencer, although not related to solar, demonstrate how internet- connected systems can serve as entry points into wider networks
if not properly protected. Modern solar inverters, connected for remote monitoring, software updates, and participation in demand response services, are no exception.
While this connectivity unlocks significant value, it also introduces risk. Fortunately, UK regulation is beginning to catch up. The UK’s Product Security and Telecommunications Infrastructure (PSTI) Act, introduced in 2024, sets out minimum cybersecurity standards for connected devices. This includes requiring strong, unique passwords and better protection of user data. Additional frameworks, such as the EU’s Radio Equipment Directive (RED) and NIS2 Directive, are expected to influence UK policy in the near future.
In this rapidly changing landscape, it is important to stay ahead of regulatory changes by choosing technologies that meet both current and future standards. Selecting inverters equipped with encrypted communication and strong authentication should be a fundamental part of this process. By adopting these forward- looking practices, contractors and installers can avoid costly retrofits or complete system replacements, while ensuring lasting project success and maintaining a strong professional reputation.
Turning Challenges Into Opportunity
Navigating both physical and cybersecurity challenges is crucial in today’s evolving solar PV landscape. Choosing technologies that comply with current and anticipated regulations – including inverters with encrypted communication and strong authentication – helps address these risks effectively. By staying proactive and adopting future-ready solutions, contractors and installers can prevent costly updates, ensure project longevity, and build customer trust, turning regulatory demands into a competitive advantage. Ultimately, those who embrace these challenges not only safeguard their installations but also strengthen their reputation and position themselves for long- term success in a rapidly changing market.
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