The remote diagnostic is free. If STS cannot resolve your fault remotely, you pay nothing — no session fee, no admin fee, no surprise charges. You only pay if we fix your system. The indicative remote fix charge is from £75 (typical for settings, configuration, or firmware-related faults). On-site repairs start from a £245 visit fee. We quote any costs in writing before any work begins.
Free remote diagnostic · No fix, no fee
Book your free remote diagnostic we only charge if we fix it
Independent solar engineer-led diagnostic, free of charge. We identify your fault in a 30-minute remote session. If we can't fix it, you pay nothing — no session fee, no admin fee, no catch. Most configuration faults are resolved during the call.
- No fix, no fee — pay only if we resolve your fault
- Same-day response, 30-minute live diagnostic
- All major UK inverter & battery brands
What's free, what's not
We diagnose your fault free. You pay only when we resolve it.
Read the full policyRemote diagnostic — always free
DIY-fixable fault (5-minute advice) — free, no obligation
Out-of-scope (DNO, manufacturer warranty) — free direction to next step
Remote fix (settings, firmware) — from £75
On-site visit — from £245 minimum, quoted before we attend
Parts — quoted separately, you approve before we buy
What you might pay
Remote solar diagnostic
Free
No fix, no fee. 30-minute live session with a written report. If STS can't resolve your fault remotely, you pay nothing.
Remote fix (if remediable remotely)
from £75
If the fault is remediable remotely (settings, configuration, firmware), the typical fix charge is from £75. Only if we fix it.
On-site repair — minimum
from £245
Minimum visit fee — applies to all on-site repairs. Parts quoted separately. Always quoted in writing before we attend.
What's included in the free diagnostic
Live 30-minute session
Engineer-led video call. We work through your system together, in real time. You see what we see, ask questions as we go.
System data review
We pull and analyse generation data, fault history, alarms, settings, and firmware. Most of what we need is in your portal or app.
Root-cause identification
Not a guess — a confirmed diagnosis. We tell you exactly what's wrong, why it happened, and what fixes it.
Written report
Emailed after the session. Confirms the fault, the recommended fix, indicative cost (if any), and any DIY steps you can take.
Honest advice
If we can't fix your fault remotely, we say so. If you can fix it yourself in five minutes, we tell you how — free of charge.
No obligation
You're under no pressure to book a fix. You can take the diagnosis and act on it yourself, or take it to another engineer if you'd rather.
How it works — 5 steps
1
Submit the form below
Tell us your name, contact details, inverter brand if you know it, and a brief description of the symptoms. Two minutes.
2
We respond same day
Within four business hours — usually within one. We confirm the diagnostic is appropriate for your case and book a 30-minute session at a time that suits you.
3
30-minute live diagnostic
Video call from your sofa. We log into your system data, run the fault-finding sequence, and identify the cause. You see what we see throughout.
4
Clear outcome
One of: (a) we fix it during the call — you pay the remote fix charge from £75; (b) DIY-fixable — we tell you how, free; (c) needs on-site — quoted in writing before we attend; (d) out-of-scope — we direct you to the right place, free.
5
Written report
Emailed within 24 hours. Confirms the fault, the action taken (or recommended), and any costs. Yours to keep regardless of outcome.
FAQ
Charging policy & common questions
You'll get a reply the same day (within four business hours, usually sooner). We confirm a time for the 30-minute diagnostic session, typically same-day or next-day. You'll receive a Microsoft Teams or Google Meet link. During the call we work through your system live, identify the fault, and explain the fix. You get a written report afterwards regardless of outcome.
You pay nothing and we tell you exactly what to do. Many common faults (CT clamp installed backwards, Eco Mode reset by firmware, charge window timing wrong, app misconfigured) take five minutes to advise on. We give you the answer free — no obligation. Our Solar Health Plan is available from £10 per month if you'd like ongoing support for future issues.
If the remote diagnostic identifies a fault that needs on-site work, we explain the scope and quote the on-site fee (from £245 minimum visit) before we arrange a visit. You commit to the on-site work before we attend, so there are no surprises. On-site visits are paid regardless of outcome — the £245 covers our travel and engineering time on site, separate from the no-fix-no-fee remote diagnostic policy.
Within 4 hours during business hours. Most diagnostics are scheduled same-day or next-day. For emergencies (no power, complete system failure, sparks or burning smells), use the emergency repair service for priority same-day response. The diagnostic itself is a 30-minute live session at a time that suits you.
All major UK brands: GivEnergy, SolarEdge, Fox ESS, Sunsynk, Victron, Growatt, Huawei, Fronius, Solis, Enphase, Tesla Powerwall, Sofar, SolaX, Pylontech, AlphaESS, SigEnergy, Dyness, Lux Power, Duracell Energy, Hanchu. We also support legacy brands (Aurora Power-One, Eversolar, Solar River, Trannergy).
Parts are quoted separately. The remote fix charge or on-site visit fee covers our engineering labour and travel; any parts needed (inverter, battery module, CT clamp, wiring, contactor, breaker) are quoted in writing before purchase. You approve costs before we install anything. This keeps pricing transparent and prevents surprises.
Yes, we are completely independent. STS Solar Tech Support is a diagnostic and repair service, not an installer. We are not affiliated with any inverter or battery manufacturer. We don't sell new solar systems. Independence matters: we tell you whether your existing system can be saved, not whether a sale is in our interest.
Book the free diagnostic anyway. We'll review your system data, generation output, and any symptoms you describe. If everything is working correctly, we tell you that — no charge. If there's a fault you weren't aware of, we explain it. If your generation is just down because of weather or seasonal expectation, we explain that too. Free either way.
Free remote diagnostic
Book your free remote diagnostic
Same-day response. 30-minute live session. Pay only if we fix your fault. Tell us your name, contact details, brand, and what you're seeing.
- No fix, no fee — pay only if we resolve your fault
- Same-day response within within 4 hours during business hours
- Written report regardless of outcome
STS Solar Tech Support
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Got a solar fault or need a quick answer? Drop us a message — we usually reply within a few minutes. Mon–Fri, 9am–7pm.
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Got a solar fault or need a quick answer? Drop us a message — we usually reply within a few minutes. Mon–Fri, 9am–7pm.
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