Commercial Solar Panels in Portsmouth

Pricing depends on roof type, access, inverter choice and whether you add battery storage, but these 2026 indicative bands give Portsmouth businesses a realistic starting point. Every figure below should be confirmed against a site-specific survey — Tom prices each job on the actual roof, not a calculator.

Payback is fastest when a business self-consumes most of what it generates — a warehouse or workshop running machinery, chillers or EV chargers through the day uses solar exactly when the sun is up. The more daytime load you have, the better the return, because avoided grid electricity is worth far more than exported units. Prices assume 0% VAT does not apply to most commercial supply-and-install (that relief is for domestic properties), so commercial quotes are shown ex-VAT with VAT normally recoverable by VAT-registered businesses — confirm your position with your accountant.

The tax treatment of commercial solar is where a lot of Portsmouth business owners are given wrong information, so here is the accurate 2026 position — always confirm the detail with your accountant.

• Solar PV is a special-rate pool asset. That matters, because it changes which allowances apply.
• Annual Investment Allowance (AIA) lets you deduct 100% of qualifying plant and machinery spend — currently up to £1,000,000 per year — in the year of purchase. For almost every SME solar project in Portsmouth, AIA writes the whole system off against taxable profit in year one.
• Spend above your AIA limit goes into the special-rate pool and is written down at 6% a year on a reducing-balance basis. (The temporary 50% first-year allowance for special-rate assets ended on 31 March 2026, so it is no longer available.)
• Do NOT claim "full expensing" or the 40% first-year allowance on solar. Full expensing and the new 40% FYA (from 1 January 2026) apply to main-rate pool assets only — solar is special-rate, so it is excluded. The 130% super-deduction ended in 2023 and no longer exists.

In plain terms: for the vast majority of Portsmouth businesses, AIA lets you offset the full cost of the array against corporation tax in the first year. That single fact often shortens the effective payback by a year or more versus the headline figures above.

Portsmouth sits in the SSEN (Scottish & Southern Electricity Networks) Southern licence area (SEPD), the Distribution Network Operator for Hampshire, the Isle of Wight and parts of West Sussex and Surrey. Any commercial array that exports to the grid above 16A per phase needs a G99 application to SSEN before it can be connected (smaller single-phase systems can sometimes use the simpler G98 notification).

• Timeline: typically around 5–11 weeks from application, longer where the local network needs a capacity study — worth building into your project plan.
• Export limits: SSEN assesses local network headroom and may cap your export below the system's nameplate rating. On some constrained Portsmouth feeders this is where design gets clever — export limitation, timed loads or battery storage keep you compliant without wasting generation.
• Larger systems: arrays above roughly 17 kWp trigger network studies, and sites above 250 kWp a full capacity study.

Tom prepares and submits the whole G99 pack for you — single-line diagram, inverter datasheets, protection settings — so you are not left decoding SSEN paperwork. It is part of the install, not an extra you chase yourself.

The strongest commercial cases on Portsea Island and around the wider harbour combine three things: generate, store and shift. Solent Solar fits all three, and Tom specifies the kit to match your load — SigEnergy, Fox ESS and GoodWe are the platforms he works with day to day.

• Solar generation on warehouse, office and industrial roofs — Portsmouth's high-density built environment means roof space is often the only viable footprint, and flat commercial roofs suit ballasted or fixed arrays well.
• Battery storage to capture midday generation and discharge into evening or shift-work demand, and to protect against constrained SSEN export limits.
• EV charging — Solent Solar is an OZEV-approved installer, so Portsmouth businesses can pair chargepoints with the Workplace Charging Scheme, which from 1 April 2026 rose to £500 per socket (up to 40 sockets, covering up to 75% of cost). Solar-fed workplace charging cuts the running cost of a fleet or staff car park to near zero at midday.

Sector examples that suit Portsmouth's economy: distribution and logistics units near the M27/A27 corridor, marine and port-adjacent businesses, trade counters and workshops, offices at campuses like Lakeside North Harbour, and light-industrial premises on estates around Fratton, Hilsea and Farlington.

Most commercial solar in the UK is sold by a call centre and fitted by whichever subcontractor is free that week. Solent Solar is the opposite: one small team, every install. Tom and his team do your survey, design the system, fit it, and are the people you call afterwards. There is no account-manager handoff and no sub-contracted crew you have never met on your roof.

• MCS-certified installations — the standard required for SEG export payments and for credible commercial specification.
• HIES member and OZEV-approved EV installer, so solar, battery and charging come from one accountable name.
• Based in Whiteley, PO15 — a genuinely local firm covering roughly 30 miles across the Solent, so Portsmouth sites get quick surveys and quick call-backs, not a van from three counties away.

Ready to see the numbers for your building? Book a free, no-obligation survey and quote with Tom. He'll assess your roof, model realistic generation for your Portsmouth location, and set out the payback and tax position in plain English.

How much do commercial solar panels cost in Portsmouth?

What's the payback on business solar in Portsmouth?

Can my business claim tax relief on solar panels?

Do I need permission to connect commercial solar to the grid in Portsmouth?

Do you install EV chargers and battery storage as well as solar?