The biggest surprise?
Solar panels rarely fail.
It’s everything else that causes problems.
After designing, installing and maintaining more than 550 solar PV and battery systems across Sussex, Hampshire and the wider South East, we’ve learned that modern solar panels are remarkably reliable. Quality panels should continue producing electricity for 30 years or more.
The issues that reduce performance are usually found elsewhere: installation quality, inverter configuration, battery settings, communications, monitoring or simple lack of maintenance.
We’ve maintained systems installed by ourselves, national installers and companies that no longer exist, giving us a unique insight into what genuinely lasts – and what doesn’t.
Here are some of the biggest lessons we’ve learned over the years.
Lesson 1 – Cheap installations nearly always cost more
One of the clearest trends we’ve seen is that the cheapest quote often becomes the most expensive system.
Typical issues include:
- Undersized cables
- Poor roof detailing
- Poor cable routing
- Inaccessible isolators
- Incorrectly fitted roof hooks
- Missing optimisers
- Poor commissioning
- Incomplete documentation
Saving a few thousand pounds on installation can easily cost far more over the life of the system through reduced performance, avoidable faults and remedial works.
There is usually a reason experienced installers aren’t the cheapest.
Lesson 2 – Monitoring pays for itself
Many homeowners only discover something is wrong when the electricity bill suddenly increases.
The system may have been partially offline for weeks – or even months.
We regularly find:
- Failed communications
- Offline inverters
- Disconnected CT clamps
- Incorrect export settings
- Batteries not charging correctly
- Optimisers reporting faults
Without monitoring, nobody knows.
Modern solar systems should tell you when something isn’t right, allowing faults to be identified before significant generation is lost.
Lesson 3 – Dirty panels aren’t usually the biggest problem
Customers often assume dirt is costing them a fortune.
In reality, rainfall keeps most domestic systems in southern England reasonably clean.
More common causes of poor performance include:
- Inverter faults
- Shading
- Failed optimisers
- Damaged strings
- Communication failures
- Incorrect software settings
Cleaning certainly has its place – particularly on farms, coastal properties and heavily wooded sites – but it’s rarely the biggest cause of lost generation.
Lesson 4 – Trees keep growing
The system generated exactly as predicted…
…when it was installed.
Five years later, the neighbouring oak tree has doubled in size.
We’ve seen many systems lose significant output simply because nobody considered how vegetation would change over time.
This is where technologies such as SolarEdge optimisers and Enphase microinverters really prove their value by reducing the impact of partial shading.
Lesson 5 – Birds love solar panels too
One of the most common maintenance issues we see has nothing to do with electrics.
It’s birds.
The sheltered space beneath a solar array provides a warm, dry and protected nesting area, making it particularly attractive to pigeons.
Unfortunately, they don’t just make noise.
Over time, nesting can lead to:
- Blocked gutters and roof valleys
- Large build-ups of droppings
- Damaged cable insulation
- Reduced airflow beneath the panels
- Increased fire loading from dry nesting material
- Unpleasant smells and noise in loft spaces
- Attraction of insects and other pests
Once birds establish a nesting site, they often return year after year.
Where appropriate, we recommend professionally installed bird protection mesh when the system is first installed, or retrofitted if birds become a problem. It’s a relatively small investment that can prevent a much larger maintenance issue later.
Lesson 6 – Batteries need correct configuration
Battery technology has improved dramatically.
The hardware is excellent.
The software configuration is just as important.
We’ve attended systems where batteries were:
- Never charging overnight
- Exporting unnecessarily
- Holding too much emergency reserve
- Ignoring off-peak tariffs
- Charging at the wrong times
- Running outdated firmware
Often there was nothing wrong with the battery itself.
It simply wasn’t configured to suit the customer’s lifestyle.
Whether it’s a Tesla Powerwall or a Sigenergy SigenStor, the best results come from reviewing settings as energy usage changes over time.
Lesson 7 – Firmware matters
Today’s solar systems are software-driven energy management systems.
Regular updates improve:
- Battery charging
- EV charging
- Whole-home backup
- Smart tariff integration
- Fault detection
- Cybersecurity
- Communications reliability
Keeping firmware up to date can improve both performance and reliability.
Lesson 8 – Inverters work harder than anything else
Solar panels quietly generate electricity.
Inverters do almost everything else.
They:
- Convert DC into AC
- Manage batteries
- Control export limits
- Communicate with monitoring platforms
- Integrate EV chargers
- Coordinate backup power
It’s no surprise they’re often the component requiring the most attention throughout a system’s lifetime.
That’s one reason we’re selective about the manufacturers we install.
Lesson 9 – Good documentation saves hours
The quickest service visits we’ve completed all had excellent documentation.
The longest usually involved:
- No drawings
- No passwords
- No commissioning records
- Missing DNO paperwork
- Missing MCS certificates
- Unknown inverter logins
A proper handover pack isn’t paperwork for paperwork’s sake.
It’s invaluable when your system needs servicing years later – or when a new homeowner takes over the property.
Lesson 10 – Fire safety never stands still
Fire safety standards continue to evolve.
Modern installations increasingly include:
- Module-level shutdown
- Optimiser safety functions
- Rapid shutdown capability
- Firefighter Gateway systems
- RC62 best practice
- Improved cable routing
- Better labelling and isolation
Many older systems remain perfectly serviceable but can often benefit from a professional fire safety review, particularly on schools, hospitals, care homes, commercial premises and public sector buildings where insurer expectations continue to evolve.
Lesson 11 – Annual servicing prevents bigger problems
A service visit isn’t just about cleaning panels.
It’s about identifying small issues before they become expensive ones.
A professional solar service should include:
- Electrical testing
- Thermal imaging (where appropriate)
- Torque checks
- Roof inspection
- Mounting system inspection
- Bird protection inspection
- Cable management review
- Inverter health check
- Battery diagnostics
- Firmware updates
- Monitoring review
- Performance analysis
- Fire safety inspection
Finding a loose connection today is considerably cheaper than replacing damaged equipment tomorrow.
Lesson 12 – Nobody gets it right every time
Here’s something you won’t hear from many installers.
Sometimes, we get things wrong.
When you’re designing and installing hundreds of systems, mistakes can happen. A component might fail unexpectedly. A software update might introduce an issue. Occasionally, we’ll spot something during a service visit that we’d do differently today.
What matters isn’t pretending we’re perfect.
It’s what happens next.
Our approach has always been simple:
- Answer the phone.
- Investigate properly.
- Accept responsibility where it’s ours.
- Put things right.
- Learn from every experience.
Many of the improvements we’ve made over the years have come directly from customer feedback and real-world maintenance.
We’ve improved cable routing.
We’ve strengthened our commissioning procedures.
We’ve adopted additional fire safety measures.
We’ve refined our quality assurance processes.
We’ve invested in better products, better training and better documentation.
Maintaining hundreds of systems has made us better installers.
Every service visit teaches us something.
Every warranty claim teaches us something.
Every support call helps improve the next installation.
That’s one of the advantages of working with an established local installer – we’ve seen how products perform not just on day one, but five, ten and fifteen years later.
The products we continue to trust
After years of installing and maintaining solar systems, we’ve become very selective about what we recommend.
We only install products we’d be happy to fit in our own homes.
That includes:
- Tesla Powerwall
- Sigenergy SigenStor
- SolarEdge
- Enphase
Not because they’re always the cheapest.
Because they’ve consistently demonstrated quality, reliability, strong technical support and long-term manufacturer commitment.
The biggest lesson of all
The best solar system isn’t necessarily the one that produces the most electricity on the day it’s commissioned.
It’s the one that’s still quietly generating clean, reliable energy twenty or thirty years later.
That comes from:
- Good design
- Quality workmanship
- Proven products
- Safe installation
- Regular maintenance
- Effective monitoring
- Ongoing support
Over the years we’ve learned an enormous amount, and we’re still learning. New products arrive, standards evolve and every installation teaches us something.
We’re proud of the systems we’ve designed and installed, but we’re equally proud of the occasions where we’ve gone back, listened to a customer, solved a problem and improved the way we work.
Nobody installs hundreds of complex electrical systems without encountering the occasional challenge.
The important thing is how you respond.
For us, that means answering the phone, standing behind our work, putting things right where needed and constantly improving our installation standards.
That’s why we continue to invest heavily in training, manufacturer accreditation, quality assurance and long-term customer support.
It’s also why so much of our work comes from repeat customers, recommendations and clients who trusted us once and continue to trust us years later.
Because great solar isn’t just about generating electricity.
It’s about looking after the people who own it.
Need a health check for your solar system?
Whether your system was installed by Bright Spark Energy or another installer, we’d be happy to help.
Our maintenance and performance reviews across Sussex, Hampshire and the South East include:
- Performance benchmarking
- Thermal imaging inspections
- RC62 fire safety reviews
- Firmware updates
- Battery health checks
- Inverter diagnostics
- Electrical testing
- Monitoring optimisation
- Bird protection inspections
- Practical recommendations to improve long-term performance
After all, the cheapest unit of electricity is the one your solar system should already be producing. Get in touch to book a health check.
