Regularly Checking Your Solar PV Can Improve its Efficiency

Verification of system performance

Now we all know that before the installation of solar PV we take a long hard look at the costs involved and the potential return on investment provided by lower energy bills or RHI. So of course you have verify that the performance of the system matches the energy output from the panels. If you start to see a gradual decline, in many cases simple electrical faults or wiring failures can cause a serious inefficiency in the ability of the panel to produce power. Although proper metering will give an indication of system performance, periodic electrical testing is vital to verify ongoing functional performance over extended periods.

Environmental degradation

PV systems by their very nature are exposed to the elements. Damage or corrosion to cabling and connectors caused by moisture ingress can result in degradation in performance or increased risk of fire. Regular electrical testing will enable system performance to be monitored and any necessary repairs or remedial actions to be taken.

Effective grounding

Photo Credit: Oregon Department of Transportation

If you are not already aware, solar panels and their racking systems must be grounded to mitigate potential electric shocks and fire hazards. In some cases, the grounding system can degrade during its later life. This could mean that anyone who comes into contact with a metal piece of the system may receive a shock. While the likelihood of shock is low, should one occur, the chance of substantial injury is great because of the high voltage arrays, and the added danger of falling from roof-mounted systems. So basically, "No, don't touch, no, hot!"

Avoiding fire risks

Due to the exponential growth of rooftop solar installation recently hitting over 500,000 UK homes, there has been an increase in a number of reported incidents of fires. Sadly Household fires started by electrical faults in rooftop solar PV systems have been reported in the UK, but have no fear! Periodic testing of the electrical cabling and components connected to the panels will ensure that you have a safe operation of the system.

Surface contamination

PV modules, like anything over time begin to accumulate dirt and grime. This can reduce the operational efficiency and system performance. Periodically cleaning the panels, much like a window can help prevent this, there are even solar panel cleaning companies that will do it for you! 

Damage to wiring

The most obvious example of bad wiring is when wires hang below the panels and touch the roof or underlying vegetation. Eventually the wire coating will wear or be damaged by rodents and potentially expose the copper wires, presenting a shock hazard. Any deterioration of cable connections and wiring can be identified by applying regular electrical testing to identify potential faults.

Photo Credit: Michael Daines

Warranty fulfilment

Periodic electrical testing of solar PV systems to identify and confirm continued safe operation and maximum energy output performance can be required as part of product warranties and PV system component guarantees.

I bid you adieu my dear Sirs and Madams!