What to Ask Before Buying a Solar Carport: 6 Questions

Q1: Which certifications should a commercial solar carport supplier hold?

The Microgeneration Certification Scheme (MCS) covers microgeneration, meaning installations up to 50 kW, so a typical commercial carport of 150 kWp or more sits outside it and should not be bought on an MCS condition. Ask instead for NICEIC or NAPIT registration for the electrical work, named structural design sign-off, CE-marked steelwork and G99 commissioning evidence, and check each on the issuing body's own register. If a small array under 50 kW is proposed, MCS does apply: check the certificate at mcscertified.com, and be cautious of suppliers who offer 'MCS-compliant' without a current certificate where one is needed.

Q2: What is your planning approval track record?

Most car-park canopies follow the Class OA prior-approval route rather than a full application. Ask prospective installers for: (1) the number of planning applications submitted in the last 3 years; (2) the approval rate; (3) average time from submission to determination; (4) examples of projects in comparable planning environments (conservation areas, AONB, urban industrial, rural edge). The best solar carport suppliers have dedicated planning managers or established relationships with planning consultants, and can evidence their approval rate and determination times. A supplier who 'handles planning themselves' but cannot cite their track record is a red flag.

Q3: What Tier-1 panel brands do you use and why?

Panel quality determines 25-year performance. Tier-1 bankability ratings (Bloomberg NEF, PVEL PV Module Reliability Scorecard) confirm that a manufacturer meets minimum financial and quality thresholds. For car park canopy use, additionally verify: bifacial certification (IEC 60904-1-1); glass-glass construction for rear-face durability; and linear power warranty terms at year 25 (look for ≥87.5% of rated output). Suppliers typically specify products such as JinkoSolar Tiger Neo, Longi Hi-MO 6, Trina Vertex S+, REC Alpha or Canadian Solar HiKu7, or equivalent — and should be able to explain why they chose that brand for your specific site conditions.

Q4: What finance routes can you offer on the project?

The best solar carport suppliers offer at least three finance routes: (1) outright capital purchase with AIA advice (they should be able to model the post-AIA payback correctly); (2) asset finance or solar lease, with the rate, term and total repayable set out in a written lender quote; (3) Power Purchase Agreement (PPA) at zero upfront capex, where the supplier funds and owns the system and you pay only for generated electricity at a below-market tariff. Suppliers who offer only outright purchase are limiting your options — and limiting their own pipeline to well-capitalised buyers. The PPA market is now well-established for UK commercial carports above 150 kWp.

Q5: What does your O&M service cover over 25 years?

Solar carport operation and maintenance (O&M) over 25 years is where long-term value is made or lost. Ask for a written O&M scope covering: monitoring (24/7 automated alerts for inverter or string faults, with response SLA); annual cleaning (deionised water, brush or robotic, with pre/post soiling loss data); scheduled preventative maintenance (torque check, DC termination inspection, insulation resistance test, inverter capacitor inspection at year 10/20); panel and inverter warranty management (who administers claims and arranges replacements?); insurance coordination; and what happens if the installer company is acquired, restructured or ceases trading. Look for an insurance-backed 25-year O&M wrap, backed by an independent insurer, not just the supplier's balance sheet.

Six red flags to avoid when shortlisting solar carport installers

These are the warning signs to eliminate: (1) No evidence of electrical registration or G99 commissioning paperwork (and no MCS certificate where the array is under 50 kW); (2) Vague structural engineering — 'we use certified installers' is not enough; you need named structural engineers with Eurocode credentials; (3) Planning glossed over — 'we've never had a planning refusal' usually means 'we've never submitted a complex application'; (4) Single finance route — outright-only suppliers have eliminated half the commercial market from their pipeline; (5) No monitoring portal included — any supplier who doesn't include 25-year remote monitoring in their base price is selling you a system they don't intend to support; (6) Too-good-to-be-true yield models — if the projected annual yield is more than 10% above the P50 from PVGIS for your lat/long, ask them to show their methodology.

Related reading: the capital allowances position · car park solar panels · solar canopies for schools.