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Commercial · One-off assessment · No contract required

Independent commercial solar performance audit

One-off on-site inspection and performance assessment for commercial solar PV and battery storage. Due diligence before acquisition, a second opinion on system performance, or an independent report for insurance, compliance, or a performance dispute. No contract required — the audit stands on its own.
from £595 · scope + fixed price quoted in writing first
Request an auditCall 07944 877 329
  • From £595 · final scope quoted in writing first
  • Written report designed for third-party use — insurer, landlord, legal
  • Independent — no manufacturer or installer bias
What's included

Single fixed-scope audit after a free scoping call. Report delivered 5–10 working days after the site visit.

Book a free scoping call
Full on-site system inspection
String-level performance testing
Yield benchmarking against expected output
Electrical safety + DNO compliance check
Battery storage assessment (where present)
Monitoring + portal verification
Written report for third-party use
All major commercial brands
5.0
Rated 5.0 on Google Read all 48 reviews

A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.

Philip Davey · Jun 2026 Google

Solar Tech Support is an absolute lifesaver. My solar and battery system stopped working completely, but after one quick phone call, they fixed the problem straight away. The original provider, GivEnergy, has gone into administration, leaving me entirely without support from the original installers. It was a terrible situation on GivEnergy’s part, but thankfully, Solar Tech Support came to the rescue!

sohaib maroof · Jul 2026 Google

I reached on behalf of a friend, who had lost control of their battery following a storm. A couple giv energy “dealers” had attempted and said different fixes. None worked. Solar tech support solved it remotely on the first attempt almost instantly. Genuinely a 10/10 service.

Will Jay · Jun 2026 Google

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration. So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026

Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.

Steve M · Jun 2026 Google

Called back within a day and gave good advice.

Rob and Sue Dempster · Jun 2026 Google

Audit pricing — by system size

Small (≤ 50 kW)
from £595

Half-day on-site. Typical small commercial rooftop. Written report within 5 working days.

Medium (50–150 kW)
from £895

Full-day on-site. Multi-string commercial array or rooftop + small battery. Written report within 7 working days.

Large (150+ kW)
from £1,495

Quoted per system. Multi-MW ground-mount or large industrial roof. Written report within 10 working days.

When you need an independent audit
Acquisition due diligence

You are purchasing or leasing a commercial property with an existing solar installation. You need to know what condition it is in, whether it is generating to specification, and what maintenance liabilities you are inheriting. The audit report feeds directly into your due diligence pack.

Insurance compliance

Your insurer requires evidence that the solar installation is in safe working order and professionally maintained. An independent audit provides the documented proof — covering electrical safety, component condition, and compliance with current regulations — from a provider with no conflict of interest.

Performance dispute

Generation figures do not match projections, and your current provider cannot explain why — or you do not trust their explanation. An independent audit benchmarks actual output against expected yield, identifies the cause of underperformance, and provides evidence you can use to hold the responsible party accountable.

Second opinion

Your current O&M provider has recommended significant work — inverter replacement, re-stringing, battery upgrades — and you want an independent view before committing. Our audit assesses whether the recommended work is necessary, proportionate, and correctly scoped.

Landlord / tenant requirement

The lease requires periodic independent assessment of the solar installation, or the landlord needs confirmation that the tenant is maintaining the system. The audit report provides the evidence both parties need — written by an independent third party.

Pre-warranty expiry check

Manufacturer warranties on inverters or panels are approaching expiry. An independent audit identifies any faults or degradation that should be claimed under warranty before the window closes — documented with the evidence needed to support the claim.

What the audit covers — 6 areas

1
Inverter inspection

Visual and electrical inspection of all inverters — error code history, firmware version, fan condition, heat damage assessment, and performance benchmarking against manufacturer specifications. SMA, Huawei, Solis, SolarEdge, GoodWe, Fronius, Sungrow, ABB, Ingeteam.

2
Panel + string testing

String-level voltage and current measurements to identify failed panels, bypass diode faults, or wiring issues. Visual inspection for hotspots, microcracks, snail trails, delamination, and physical damage. Shading and soiling assessment where relevant.

3
Electrical safety + compliance

DC isolator condition, cable routing and integrity, earth continuity, insulation resistance testing, and verification of protective device settings. DNO connection agreement reviewed for G98/G99 compliance. Safety issues flagged with a clear risk assessment.

4
Battery storage assessment

Where battery storage is present — state of health, charge/discharge cycle history, BMS configuration, cell balancing status, thermal management. Warranty status verified where manufacturer records are available. Degradation benchmarked against expected lifecycle.

5
Yield benchmarking

Actual generation compared against expected output based on system size, orientation, tilt, location, and shading profile. Where monitoring data is available, we analyse historical trends to identify degradation patterns, seasonal anomalies, and periods of underperformance. If monitoring is offline, we note this and recommend restoration.

6
Written report

A comprehensive written report documenting system condition, all findings, identified faults, performance benchmarks, safety compliance status, and clear recommendations. Designed for third-party use — share it with your landlord, insurer, legal team, or procurement department. Delivered within 5–10 working days of the site visit.

FAQ

Independent audit — frequently asked questions

The audit is a comprehensive on-site inspection covering all inverters, panels, cabling, isolators, battery storage (where present), mounting systems, and electrical connections. We test string-level performance, verify monitoring accuracy, benchmark actual yield against expected output, and check safety compliance. The result is a written report documenting current system condition, any faults or underperformance, and clear recommendations.
The scope of the on-site work is similar — the same thorough inspection is carried out. The difference is context and purpose. An annual inspection is part of an ongoing maintenance arrangement and feeds into a continuous maintenance record. An independent audit is a standalone assessment, often commissioned for a specific reason — due diligence, a second opinion, compliance, or a performance dispute. The audit report is designed to stand on its own and be shared with third parties.
Yes. The audit report is written to be shared with insurers, landlords, facilities managers, and procurement teams. Because STS is independent — not tied to any manufacturer or installer network — the findings carry credibility as an objective assessment. We can tailor the report format to meet specific compliance requirements if needed.
No. The independent audit is a standalone service with no obligation to proceed to ongoing maintenance. Many clients use the audit report independently — for due diligence, to challenge a previous provider, or to support an insurance claim. If you do want to move to ongoing care, the audit serves as the baseline for a system-takeover engagement, but that decision is entirely yours.
The on-site inspection is typically completed in a single visit — half a day for most standard commercial rooftop systems up to 50 kW, a full day for larger or more complex installations. The written report is delivered within five to ten working days, depending on the scope and any additional data analysis required.
Yes. We audit commercial solar systems regardless of who installed them. We are not tied to any installer network or manufacturer — our assessment is based solely on the condition and performance of the equipment on site. If the original installer is no longer trading or you have concerns about their work, an independent audit provides the objective evidence you need.
All major commercial inverter brands: SMA, Huawei, Solis, SolarEdge, GoodWe, Fronius, Sungrow, ABB, Ingeteam, plus smaller brands you may find on legacy installations. Battery storage from BYD, Pylontech, GivEnergy commercial, Tesla Powerpack, and others. Three-phase, string and micro-inverter configurations all supported.
Three tiers based on system size. Small (≤ 50 kW): from £595 — half-day on-site plus written report. Medium (50–150 kW): from £895 — full-day on-site. Large (150+ kW): from £1,495 — quoted per system. All prices include the written report. Travel beyond Yorkshire / East Midlands quoted separately.
Commercial audit enquiry

Request an independent audit

Tell us about the system and the reason for the audit. We confirm scope and pricing within one business day. No obligation to proceed to ongoing maintenance.

  • Free scoping call — no commitment
  • Written scope + fixed-price quote within one business day
  • Independent — no manufacturer or installer bias

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

Call 07944 877 329 Book free diagnostic