Service & Maintenance

Commercial Solar PV is one of the highest renewable energy sources in the UK. Over the past 8 years many businesses have adopted this technology in order to not only lock in their energy costs for the future but also to create revenue streams to generate financial rewards for their organisation.

Whether you are involved in agriculture, farming, dairy, poultry or a commercial organisation it is important to protect this asset and revenue stream.

Mole Energy: Solar PV Upgrades to Maximise System Efficiency

On larger systems with multiple inverters being used it is critical that these systems operate to their optimum efficiency to ensure yield creation is at its best.

MoleEnergy service and maintain over 10MW of creation annually and this is set to triple over the coming 12 months. We offer one of the most comprehensive maintenance programmes available from on-site maintenance and servicing of ALL different manufacturers inverters to consistent remote monitoring of your array to ensure maximum efficiency.

Our service packages maintain systems from 10kW to 500kW and are versatile and flexible to meet your needs as an owner. With complete visibility and troubleshooting whilst on site a fully comprehensive report is created highlighting all aspects of your system and advice and recommendation on enhancing and increasing your output.

10 reasons why

you should consider having a service and maintenance contract for your commercial PV system

Mole Energy - Commercial
Compliance with IEC 62446

IEC 62446 recommends that periodic verification of an existing installation shall be performed. The standard defines the minimum requirements for system documentation, commissioning tests and inspection for PV systems. As such, this standard not only specifies the minimum electrical testing and inspection requirements but equally importantly how the inspection and test results are documented and supplied to the consumer after installation.Where appropriate, the results and recommendations of previous periodic verifications shall be taken into account. A periodic verification report shall be provided and include a list of any faults and recommendations for repairs or improvements (such as upgrading a system to meet current standards).

Avoiding fire risks

As the number of rooftop solar installation systems have grown over the years, so have the number of reported incidents of fires. Household fires started by electrical faults in rooftop solar PV systems have been reported in the UK, Australia, the USA and France – among others. The periodic testing of the electrical cabling and components associated with solar PV systems will ensure the safe operation of the system and reduce the potential fire risk associated with any electrical faults.

Effective grounding

As with all electrical equipment, solar panels and their racking systems must be grounded to mitigate potential electric shocks and fire hazards. If the grounding system degrades over time, 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.

Ground faults

PV systems, in particular large-scale systems, have many metres of cabling, much of which is buried underground. Poor levels of insulation will allow energy generated by the PV system to leak to earth. This can be particularly problematic during damp or wet conditions where the insulation monitoring or residual current monitoring function within an inverter prevents the inverter from starting up, which in turn can significantly reduce the operational efficiency of the PV installation.

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.

Surface contamination and physical damage

PV modules can become dirty or contaminated over time and this can reduce the operational efficiency and system performance. Similarly, exposure to the elements can result in physical damage to the component parts of a PV installation. Objects dropped by birds can result in physical damage to PV modules which may result in reduced output performance. Periodic electrical testing as part of regular maintenance will enable any problems to be identified and diagnosed.

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.

Verification of system performance

The installation of solar PV systems is only undertaken after careful consideration of the costs involved and the potential return on investment provided by lower energy bills and FiT payments.As a result, the verification of system performance and energy output from the panels is particularly important. 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.

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.

Customer documentation

All solar PV installations require the provision of various documentation and forms to the customer. System documentation usually includes system data, installer details, electrical diagrams, operation and maintenance instructions and other information that may be required by certain standards or regulatory bodies .Copies of all test and commissioning data should also be provided and as a minimum this should include the results from the electrical safety and verification tests undertaken as part of the system installation procedures.


Many insurance companies now require all Solar installations to be regularly maintained in order to comply with the policy terms of insurance. This becomes especially applicable in commercial installations but is becoming increasingly relevant in the domestic arena. Failure to comply renders all policies null and void.

Service & Maintenance Plan

Many insurance requirements now also make maintenance mandatory to ensure compatibility and system safety.

There are areas of your solar system which are critical such as the Inverter, which requires regular updates including enhanced software, wiring, protection, and also that of the panels themselves to ensure they are operating at their optimum level. These are critical aspects of your asset and as such need to be regularly reviewed each year to ensure they are operating safely and efficiently.

Mole Energy offers a comprehensive service and maintenance plan that covers all aspects of your commercial PV system and installation and all makes of panels and inverters.

Each annual plan includes amongst others:

  • A comprehensive system check and safety analysis of the system
  • Full diagnostic analysis and report
  • Software updates and trouble shooting including system errors
  • Visual inspection of all electrical components from ground level
  • Solar PV generation check and report
  • Full AC and DC electrical systems check.
  • Upgrade recommendations and advice for battery ready systems including enhanced energy creation and monitoring
  • 1 Free callout per annum

Comprehensive cover for your asset is essential for your ongoing energy generation and protection of your solar PV system.


PV Installation size Service plan fee
Up to 12kW £249 = VAT
13kW – 24kW £299 + VAT
25kW – 34kW £349 + VAT
35kW – 49kW £399 + VAT
50kW and above Call for price

To book your Domestic plan and initial service

contact our service and maintenance team on

01803 732946

Mole Valley Farmers
Part of the Mole Valley Farmers Group