Your solar system
diagnosed, recovered
and back online.
When your inverter faults, battery stops charging, or monitoring goes dark — you need engineering clarity, not sales. STS provides independent, evidence-led solar diagnostics and repair across the UK.
Select your symptom and brand — we’ll show next steps instantly.
Safety: do not open covers or do live electrical work. If you smell burning or see arcing, isolate safely and call 999.
Start remote. Fix fast.
We diagnose the real issue first, then do the minimum required work to restore safe generation. Remote-first, on-site only when needed.
Remote Solar Diagnostic
Fault codes, underperformance, battery issues, monitoring outages. We review your evidence and identify the real cause.
- ✓ Root cause + clear options
- ✓ Settings validation (where safe)
- ✓ Written engineer summary
System Recovery
Installer gone bust, access locked, ownership transfer, monitoring rebuild. We restore control of your system.
- ✓ Portal & monitoring access recovery
- ✓ Handover documentation pack
- ✓ Warranty evidence support
On-Site Technical Visit
Hardware faults, CT rewires, EPS circuit checks, independent inspections. Targeted visits, no guesswork.
- ✓ Targeted site checks
- ✓ Safety-focused reporting
- ✓ Clear repair plan
Solar Health Check
Full system performance audit. Catch underperformance before it costs you — ideal after purchase or installer change.
Book health check →Independent Inspection
MCS compliance checks, pre-handover inspections, warranty claim support. Unbiased, documented, defensible.
Book inspection →Solar Health Plan
Annual cover for diagnostics, priority support and performance monitoring. Peace of mind, year-round.
See health plans →Recognise your fault?
Every fault below has a repeatable diagnostic path. Click your symptom to go straight to the right page.
Hard stops, no output, complete shutdown, fault state.
Charge windows, CT errors, BMS faults, firmware issues.
App not updating, portal dark, logger disconnected.
Inverter tripping high voltage, evidence packs, DNO.
Inverted readings, backwards battery behaviour, wrong data.
Wrong cap, meter conflicts, DNO compliance failures.
Access locked, no warranty support, orphaned system.
Generation lower than expected — shading, config, hardware.
Inherited a solar system?
Bought a house with solar already installed? Don’t know what you have, who installed it, or if it’s even working correctly? We identify your system, check performance, and get you in control.
Start here →Your installer has gone bust?
No response, company dissolved, or left with a locked system? We recover monitoring access, rebuild documentation, and support warranty claims — without depending on the original installer.
Get recovery support →Deep brand expertise
Each brand page covers brand-specific fault codes, configuration guides, common problems and repair services.
Yorkshire-based. UK-wide remote.
Remote diagnostics available nationwide from day one. On-site visits cover Yorkshire and surrounding regions. We’re expanding — check your area.
Transparent pricing.
No call-out surprises. Remote-first means lower cost. We tell you what’s needed before you commit to a visit.
Evidence review + structured diagnosis + written action plan.
- ✓ 30–45 min engineer call
- ✓ Fault path + next steps
- ✓ Written summary
Access recovery, ownership transfer, clean handover documentation.
- ✓ Ownership & access strategy
- ✓ Remediation plan
- ✓ Warranty evidence support
Targeted physical checks. CT rewires, isolation faults, EPS, hardware.
- ✓ Evidence-led site visit
- ✓ Safety-focused report
- ✓ Repair options
Remote-first: if the fastest, safest route is remote, we take it. On-site only confirmed necessary before booking.
Solar knowledge base
Practical guides written by engineers — not marketing copy.
What they do, how direction affects readings, and how to spot a miswire.
G98, G99, DNO constraints, and what a correct export limit looks like.
Brand-by-brand breakdown of what fault codes mean and what to do.
BMS, SoC, charge rates, and why your battery behaves the way it does.
When to update, when not to, and how to recover a failed firmware flash.
Grid connection standards, DNO notification thresholds and compliance.
Common questions
Yes — most faults are diagnosed and resolved remotely. We start with monitoring data, settings review and evidence-led troubleshooting. If an on-site visit is required, we confirm exactly what needs checking so there’s no wasted callout.
We specialise in this. We handle monitoring access transfer, rebuild missing documentation, support MCS certificate queries, and compile warranty evidence packs — so you’re no longer dependent on an installer that no longer exists. See installer gone bust support →
No. We never ask homeowners to open covers or perform live electrical work. We focus on evidence, monitoring data, safe external checks, and clear guidance. If physical work is needed, a qualified engineer visits on-site.
This is more common than you’d think. We identify the system, assess performance against design spec, check MCS documentation, and get you proper monitoring access. See inherited system support →
All major UK brands: SolarEdge, Huawei, Sunsynk, GivEnergy, Growatt, Solis, Enphase, Fronius, Fox ESS, Tesla Powerwall, Pylontech, Sofar, AlphaESS, Duracell Energy, and Sigenergy. Browse all brand pages →
Ready to get your system working properly?
Tell us what’s happening. We’ll review your details and come back with a clear diagnosis path and a proposed time to talk.