Existing solar PV systems

Solar PV servicing
& electrical checks.

SL4 supports existing solar PV and associated battery systems with electrical servicing, inspection, testing and fault-finding. SL4 does not sell complete solar PV or battery-storage installations as a standalone service.

Start a WhatsApp quote →Call Shaun

LOCAL · TESTED · TRUSTED

What’s included

Professional from
start to finish.

Checks are scoped around the existing equipment, the reported problem and what can be accessed safely. Shaun explains what can be tested electrically and when a manufacturer or specialist system installer is the appropriate next step.

Solar PV servicing & inspection

Accessible equipment, connections, labelling and the visible condition of the electrical installation can be checked as part of a defined service visit.

Electrical fault-finding

Reported faults, loss of generation and tripping can be investigated methodically to establish whether the issue lies within the electrical work or needs manufacturer-level support.

AC & DC electrical checks

Appropriate AC and DC measurements can be carried out where the system, access and agreed scope allow, with findings explained clearly.

Inverter, isolator & protection checks

Accessible inverter supplies, isolators, circuit protection, earthing and associated wiring can be inspected and tested where appropriate.

Genuine completed work

See the installation.
Explore the detail.

These are real SL4 projects showing the finished work and the electrical issues addressed. Where matching customer feedback is available, it is clearly identified on the project page.

Moseley, Birmingham · Solar PV fault findingDead PV string traced panel by panelSee how section-by-section testing isolated one failed module or optimiser assembly, identified a separate heat-damaged MC4 connection and returned the remaining array to generation.View full project →

Solar & battery backup

Will solar and batteries work
during a power cut?

Not automatically. Many standard grid-connected solar PV systems shut down when the public supply fails. Backup operation requires equipment and electrical design specifically intended to separate safely from the grid and supply selected or whole-home loads in island mode.

Standard solar PV

Usually shuts down with the grid

Grid-connected inverters are normally designed to stop energising the installation when the public supply is lost. Having solar panels on the roof does not by itself mean the house will stay powered during an outage.

Battery backup

Backup must be designed for it

A battery can provide backup only where the inverter, switching arrangement, earthing, protection and connected circuits have been designed for island-mode operation. The exact capability depends on the installed system.

Electrical protection

Island mode changes the fault path

When a system operates independently from the grid, fault protection and RCD selection must still work correctly with the inverter and connected loads. This is why backup arrangements need proper design, testing and verification.

Not sure what your existing system can do?Send the inverter and battery make/model, any fault code and safe photos of the consumer unit, meter area, inverter and isolators. I can advise what electrical checks are appropriate.

Ask about solar electrical checks

Warm Homes Plan · 2026

The government's 2026 Warm Homes Plan puts rooftop solar, home batteries, clean heat and energy efficiency at the centre of future home upgrades. For SL4 customers, the relevant service remains electrical support for existing solar and battery systems—servicing, testing and fault-finding—rather than selling complete solar or battery installations.

Read the government Warm Homes Plan ↗

BS 7671 Amendment 4:2026

The latest Wiring Regulations add a dedicated chapter for stationary secondary batteries, including system design, power-conversion equipment, bidirectional or hybrid inverters, protective devices for two-way power flow, battery location, ventilation and fire-risk considerations. That makes whole-system assessment increasingly important when battery storage is added, altered or investigated.

Read SL4's plain-English Amendment 4 guide →Read the IET/BSI Amendment 4 summary ↗

Simple process

What happens next

1Send the property postcode, equipment make and model, any fault code and safe photos of the consumer unit, inverter and isolators.
2Shaun will confirm whether the requested servicing or electrical checks fall within SL4’s scope.
3You receive a clear quotation for the agreed electrical inspection, testing or fault-finding work.
4The checks are completed and the findings explained, including any specialist follow-on action that may be needed.

Helpful answers

Common questions
answered clearly.

Practical information before you arrange a quotation or site visit.

Does SL4 install complete solar PV or battery-storage systems?

No. SL4 does not sell complete solar PV or battery-storage installations as a standalone service. The service offered here is solar PV servicing, electrical inspection, testing, fault-finding and electrical support within wider renewable projects.

Can you test an existing solar PV system?

Yes, where the agreed scope and safe access allow. Checks may include appropriate AC and DC measurements, accessible wiring, inverter supplies, isolators, protection, earthing and labelling.

Will my solar panels and battery keep the house running during a power cut?

Not necessarily. A normal grid-connected solar system usually shuts down when the public supply fails. Backup operation requires compatible equipment plus a correctly designed switching, earthing and protection arrangement for island mode. Check the exact inverter and battery setup rather than assuming backup is available.

Can you investigate a solar inverter fault?

Shaun can carry out relevant electrical checks and fault-finding. If the issue requires manufacturer diagnostics, software access or specialist work inside the equipment, the findings will be explained so the correct specialist can take it forward.

Can SL4 support a wider renewable-energy project?

Yes. SL4 can provide defined fixed electrical work and testing within a wider renewable project, coordinating with the lead renewable or equipment installer. This is separate from selling the complete solar PV or battery system directly.

What should I send with an enquiry?

Send your postcode, the inverter and other equipment make and model, any warning light or fault code, previous test information, and safe photos showing the consumer unit, meter area, inverter and accessible isolators. Do not remove equipment covers.

Let’s talk

Need a straightforward quote?

Answer a few quick questions, see which photos will help and open a completed message in WhatsApp.

Start guided enquiry →Or call Shaun →

Solar PV servicing& electrical checks.

Professional fromstart to finish.