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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 to enquire and have us take a look. If we can fix it remotely it's £125; if we can't, you pay nothing. We identify your fault in a 30-minute remote session. No session fee, no admin fee, no catch. Most configuration faults are resolved during the call.
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  • No fix, no fee covers remote fixes. On-site work is quoted in writing before we start.
  • 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 policy
Remote 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) — £125
On-site repair — from £295, quoted before we attend
On-site WiFi setup, from £195
Parts — quoted separately, you approve before we buy

Written by · Independent Solar Engineer Last updated

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)
£125

If the fault is remediable remotely (settings, configuration, firmware), the fix charge is £125. Only if we fix it.

On-site repair — minimum
from £295

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 £125; (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

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 remote fix charge is £125 (for settings, configuration, or firmware-related faults). On-site repair visits are from £295. We quote any costs in writing before any work begins.
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, charge window reset by firmware, charge window timing wrong, app misconfigured) take five minutes to advise on. We give you the answer free — no obligation.
If the remote diagnostic identifies a fault that needs on-site work, we explain the scope and quote the on-site fee (repair visits from £295) before we arrange a visit. WiFi isn't remote work: if a dongle or logger won't reconnect after the steps in our WiFi not connecting guide, we can set it up on site, from £195. You commit to the on-site work before we attend, so there are no surprises. On-site visits are paid regardless of outcome: the visit fee (from £295 for a repair, from £195 for WiFi setup) 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 covers remote fixes. On-site work is quoted in writing before we start.
  • Emergency response within 4 hours during business hours
  • Written report regardless of outcome

By submitting you agree to be contacted about your diagnostic request. We don't share your data with 3rd parties.