Solar PV Commissioning and Handover: What Test Evidence Should Be Recorded?

Solar PV Commissioning and Handover: What Test Evidence Should Be Recorded?

There is no single universal “solar PV certificate”. A proper handover is usually a bundle: the electrical installation record that fits the work, commissioning and test evidence, a clear record of what was installed, and the operating information the owner will need. MCS, building-regulations and DNO paperwork sit alongside that bundle only where the relevant route applies.

That distinction matters when someone asks for “the solar certificate” years later. An MCS certificate does not replace the electrical record. A commissioning sheet does not prove every test by itself. A DNO reference is not an inspection certificate.

Here’s how to build a handover pack that lets the owner, the next electrician and anyone investigating a fault work out what was installed, what was checked and what remains conditional.

Quick summary

• Choose the electrical record for the actual work and scope. The IET publishes separate form families for an Electrical Installation Certificate (EIC), a Minor Electrical Installation Works Certificate and an Electrical Installation Condition Report (EICR).
• Keep commissioning and test results with the relevant array, string, circuit, device or operating mode. A number without that identity and a method or comparison basis is weak evidence.
• Add MCS, building-regulations and DNO/network documents where those routes apply. They answer different questions and do not replace electrical certification.
• Hand over the product manuals, safe shutdown and restart information, monitoring arrangements, warranty route and maintenance expectations.
• If an energy storage system (battery) is included, record its own commissioning and operating modes. Do not assume the original PV paperwork covers later battery work.

There is no single universal solar PV certificate

People use “solar certificate” to mean several different things: an electrical installation record, an MCS certificate, a commissioning sheet, a DNO reference or a pack of product documents. Start by naming the evidence, then state what it proves and what it does not.

An EICR is a condition report, not the normal commissioning record for a new installation. The right electrical record follows the work and scope, not the phrase a customer used when asking for paperwork. Check the current IET model-form guidance and the applicable BS 7671 requirements when deciding which record fits a particular job. Do not choose an EIC or Minor Works certificate from a generic solar checklist alone.

MCS explains that its certificate is evidence of design, installation and commissioning to recognised standards using MCS-certified products and an MCS-certified installer. Its certificate guidance says the certificate is not a universal legal requirement. A contract, incentive, export arrangement or warranty may still make MCS evidence practically important, so confirm the route for the job rather than assuming either way. The same MCS certificate guidance says an MCS-certified installer should issue the certificate directly to the consumer within 10 days of commissioning; that is not a universal deadline for every electrical record or handover document.

Record the system identity first

Before writing down readings, make it possible to tell which system and component they belong to. Record the site address, owner or client, installer, job reference and installation and commissioning dates.

For the array, identify the module make and model, quantity, array or roof-section identifiers, string count and a string map. Capture module serial numbers where that is part of the job record. For the conversion and AC side, identify the inverter make, model and serial, relevant firmware where useful, AC circuit reference, protective devices, isolators, earthing arrangement and monitoring or meter identity.

If a battery or hybrid inverter is fitted, add the equipment models and serials, the manufacturer’s stated capacity and power, isolation points, operating mode and any backup or island arrangement that is actually present. Keep PV-only and storage equipment distinct in the record, even where they share an inverter or enclosure.

Record an MCS certificate number, DNO application or reference, and building-control details only when those routes apply and the reference exists. Never leave a blank that could be mistaken for a completed approval, and never invent a number to make the pack look finished.

What commissioning and test evidence should be recorded?

For an MCS PV installation, MIS 3002:2025 Issue 1.0 requires commissioning under a documented procedure (clause 4.1.1). Clause 4.1.2 requires inspection and testing in accordance with Section 16 of the IET Code of Practice, except Section 16.4. Use the current standard, design and manufacturer instructions. That is a framework for the job, not a claim that every installation has an identical checklist or pass value.

Record each PV string and AC circuit separately. Include the test date, instrument or method, result and units, and enough identity to trace the result back to the relevant string, circuit or device. Where applicable to the design and test method, typical PV/DC evidence may include polarity, continuity or protective bonding, insulation resistance, string open-circuit voltage or current checks, connector and isolation checks, labels, and the mapping between the array and inverter.

For the AC and electrical installation side, record the checks relevant to the work and design. These may include protective-conductor and bonding continuity, insulation resistance, polarity, earth-fault-loop impedance and prospective-fault-current checks, RCD or RCBO functional or trip results, protective-device and circuit identity, and relevant inverter connection checks. These are examples of evidence fields, not a universal test list.

Add functional commissioning results: startup and shutdown, inverter behaviour, generation or meter readings, monitoring connection, protection or fault indications, and any remedial action or limitation. State what was actually checked. If something could not be tested, or a defect remains, record that plainly with its scope and next action rather than smoothing it away in the handover.

A reading only makes sense against the circuit or string, test method, equipment, design and current technical basis. A bare value copied into a PDF cannot show whether the right conductor, mode or protective device was tested, or whether the result was judged correctly.

Batteries and hybrid systems add another evidence layer

Where an electrical energy storage system (EESS) is within scope, use the applicable battery requirements as well as the electrical installation record. MCS MIS 3012:2025 calls for documented commissioning that addresses safety, the standard, manufacturer requirements and correct operation. Clause 4.1.3 requires earth-fault-loop impedance and prospective-fault-current verification for all operating modes. It specifically says tests representing charging mode must be made with all inverters and bi-directional converters in the installation disconnected.

The standard’s example commissioning checklist is additional to the certification and schedules required by BS 7671; it is not a replacement for them. Keep results tied to the mode and equipment tested. Record backup or island operation, charge and discharge controls, isolation, alarms and monitoring only where those functions are actually installed and checked. Do not copy fixed values or settings from another system.

A battery fitted later may have a different installer, electrical scope, DNO or building-regulations route, and MCS scope from the original PV installation. Identify who designed, installed, tested and commissioned each part. Do not let the original PV handover imply that later storage work was included when it was not.

Keep MCS, electrical, building and DNO paperwork separate

The IET publishes distinct model-form resources for EICs, Minor Electrical Installation Works Certificates and EICRs. Use the appropriate record for the work, and keep its schedules with it. An EICR reports condition at the time of a periodic inspection; it is not a retrospective commissioning certificate for new work. For the separate EICR inspection sequence, see the EICR checklist; it is a companion, not a solar commissioning checklist.

Building-regulations evidence is a separate stream. In England, Approved Document P covers electrical safety in dwellings, including notification and information about design, installation, inspection and testing. That is England-specific guidance. Scotland, Wales and Northern Ireland have separate building-regulations routes, so do not present England’s Part P wording as a UK-wide rule.

DNO or network paperwork concerns the connection and network process where applicable. Keep the relevant submission, acceptance or reference and any conditions with the job record. Do not call a DNO reference proof of electrical inspection or testing, and do not assume every system follows the same notification route or threshold. Check the current process for the actual system rather than relying on a generic G98/G99 number in an article.

The owner’s handover is part of the job

A technically complete test record is not much use to an owner who cannot shut the system down safely or tell who to call when an alarm appears. Include the manufacturer instructions for the installed inverter, battery and monitoring equipment; normal operating information; safe isolation and shutdown/restart sequence; monitoring and warranty/support route; installer details; and maintenance or fault-escalation expectations.

Add system-specific diagrams, labels and photographs where they make the installation easier to understand. Do not put customer app passwords in the report. Explain how account ownership or access is transferred and where credentials are managed instead.

A practical handover review

Before closing the job, check the pack against these questions:

1. Does the site and equipment identity match what is actually installed?
2. Does the electrical record fit the work, with the relevant schedules attached?
3. Can each recorded result be traced to a string, circuit, device or operating mode, with date, method and units?
4. Are functional commissioning checks, limitations and outstanding remedial actions visible?
5. Are MCS, building-regulations and DNO/network documents marked as applicable only where the route applies?
6. Does the owner have operating, shutdown, monitoring, warranty and maintenance information?
7. If there is a battery or later alteration, is the work boundary and the responsible installer clear?

This is a review aid, not a universal certificate or a substitute for the applicable standards and competent judgement. MCS MIS 3002 includes commissioning templates, but a template is a starting point, not proof that the right system-specific evidence has been captured.

If paperwork or commissioning evidence is missing

Ask the original installer for the electrical record and schedules, commissioning record, product handover information, and any applicable MCS, building-control or DNO references as separate items. A missing MCS certificate, missing test schedule and missing inverter manual are different problems; asking for “the solar certificate” may not get the missing evidence back.

Do not create a replacement certificate from an invoice, monitoring-app screenshot or MCS certificate. If the original evidence cannot be recovered, arrange a competent inspection and testing review with its scope and limitations recorded. Treat later battery or alteration work as a separate scope unless the records show it was included.

Common questions

Is an MCS certificate the same as a solar PV electrical certificate?

No. An MCS certificate is scheme evidence for work within the MCS route. It does not replace the appropriate electrical installation record or commissioning and test evidence. MCS says its certificate is not a mandatory or legal requirement for every system, although a contract or another route may make it important in a particular case.

Is an EICR the right document for a new solar installation?

An EICR is a condition report for an existing installation at the time of inspection. It is not the normal commissioning record for new installation work. Confirm the electrical record required for the actual work and scope.

What test results should a solar installer record?

Record the checks required by the applicable standard and design, tied to the relevant PV string, AC circuit, equipment or operating mode. Include the method, date, units and result, plus functional commissioning and any limitation or remedial action. There is no safe universal list of test values for every design.

Do all solar PV systems need an MCS certificate?

MCS states that its certificate is not a mandatory or legal requirement for every installation. It may still matter under a contract, incentive, export arrangement or warranty. Check the requirements that apply to the job.

What extra evidence is needed for a solar battery?

Use the applicable EESS commissioning and testing requirements, including evidence for the operating modes actually present. MIS 3012:2025 clause 4.1.3 requires verification in all operating modes and specifies that charging-mode tests are made with all inverters and bi-directional converters in the installation disconnected. Its example commissioning checklist is additional to BS 7671 certification and schedules. Do not assume a PV-only record covers a later battery installation.

Does the same paperwork apply in Scotland, Wales and Northern Ireland?

Not in every respect. England’s Approved Document P is not a UK-wide building-regulations route. Check the separate building-regulations requirements for the nation where the work is carried out.

Keep the evidence together

The useful handover is the one a different electrician can still follow later: system identity, the right electrical record, traceable test results, commissioning checks, any conditional scheme or network evidence, and clear owner instructions.

Keep the certificate, test evidence and system handover information together in an indexed job record. A structured inspection and test record can help with the evidence trail, but software does not choose the certificate, validate readings or replace competent design, testing and commissioning. For related record-keeping context, see paper versus digital EICRs.