70kW Commercial Solar Panel System UK

The right fit

Why a 70kW system could be the right fit

A 70kW commercial solar system suits manufacturing units, multi-tenant office buildings and large retail units with annual electricity demand of 60,000 to 90,000 kWh. It uses 140 to 155 panels across 320 to 380 square metres of roof.

For manufacturing operations on extended day shifts, self-consumption frequently exceeds 90%, making the financial case particularly strong even without storage. Multi-tenant offices benefit from clear submetering that allocates solar generation between tenants, and all paperwork, grid approvals and AIA guidance are handled by Solar4Good.

The datasheet

70kW spec sheet

Indicative figures for a 70kW commercial system on a typical UK site. Your exact output depends on your roof, orientation, shading and usage, confirmed in a site visit.

System size70 kW DC

Solar panels140-155

Roof space320-380 m²

Site demand60,000-90,000

Annual output59,500

Self-consumption80-95%

VAT20% reclaimable

Capital allowanceAIA-eligible

Business ratesExempt to 2035

Panel warranty25 yrs

Indicative, not a quote · final figures after a free roof assessment.

What is included

140-155 tier-one panels

High-efficiency panels, sized to deliver 70 kW DC across your commercial roof.

Commercial inverter (three-phase)

A quality inverter, three-phase ready, with capacity for battery and peak-shaving.

Mounting, wiring & connection

All roof mounting, cabling and grid connection, done neatly and safely.

Commercial monitoring dashboard

Live generation and consumption data for your facilities team, set up before we leave.

Full MCS install + AIA guidance

Fitted under our own MCS registration, with AIA capital-allowance guidance for your accountant.

25-year panel warranty

Plus a team you can still call after switch-on. Every job certified under our own MCS registration.

On real UK rooftops

Sized for your building, fitted under our own MCS registration

Every 70kW system is designed around your site’s demand profile and usage, then installed by the same MCS-certified team that assessed it. Certified under our own MCS registration, no remote sales centre, 3,000+ UK homes and counting.

Storage

70kW: self-consumption and battery

Panels only

Good if you use power in the day

The panels power the site during working hours and export the surplus for a payment under SEG. Ideal if your demand is daytime: production, refrigeration, machinery or EV charging while the sun is up.

Panels + battery

The most common upgrade

Battery storage shifts daytime solar into evening, out-of-hours and peak-rate periods, lifting self-consumption further and cutting demand charges. Sized to your load profile during the design stage.

The right size?

Is 70kW enough for your site?

For businesses using 60,000 to 90,000 kWh a year, a 70kW system covers a large share of demand, and for extended-shift manufacturing self-consumption frequently exceeds 90% without a battery.

If your demand is lower a 50kW system may suit; if higher, look at 80kW or 100kW. We size precisely from 12 months of your meter data, and for multi-tenant sites we design in submetering to allocate generation fairly.

How it works

Go commercial solar in three steps

STEP 01

Site visit + structural assessment

A local engineer visits, assesses your roof for pitch, orientation and shading, and designs a 70kW system around your actual demand profile. No cost, no obligation.

STEP 02

Fixed-price commercial proposal

A clear, itemised commercial proposal with AIA modelling guidance for your accountant. We handle all paperwork and grid approvals as standard.

STEP 03

Installation & commissioning

Our in-house team completes installation in one to three weeks on site. Tested, MCS-certified and the commercial monitoring dashboard set up before we leave.

Why Solar4Good

Engineer-led, in-house, UK-wide

You work with a UK-wide commercial team based in Harrow, not a remote sales centre. The person who assesses your roof is directly involved in designing the system, and once it is in we handle MCS certification, SEG export-tariff setup and your monitoring app, so you are never left navigating the process alone.

3,000+UK installs

50,000+Panels installed

4.9★from 1,000+ reviews

MCSCertified, in-house

Rated 4.9/5 from 1,000+ verified reviews on Trustpilot, TrustATrader and Google

“George the sales chap was straightforward and honest, and the whole installation team were awesome, courteous and professional throughout.”

Jamie Wilson · Verified Trustpilot review

“From start to finish the whole job has been seamless. The install guys were polite, knowledgeable and efficient.”

Timothy Clarke · Verified Trustpilot review

“I wholeheartedly recommend this company for solar and battery storage installation.”

Soham Acharya · Verified Trustpilot review

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Good to know

The questions businesses actually ask about a 70kW commercial solar system.

Is a 70kW system right for a manufacturing unit?

A 70kW system suits manufacturing units, multi-tenant offices and large retail with annual demand of 60,000 to 90,000 kWh. On extended day shifts, self-consumption frequently exceeds 90%, so the case is strong even without storage.

How many panels are needed for 70kW?

140 to 155 panels across roughly 320 to 380 square metres of roof, sized to deliver 70 kW DC. They fit most large commercial and industrial roofs.

What is the business case for commercial solar?

Commercial solar is eligible for the Annual Investment Allowance, business rates exemption to April 2035, and 20% reclaimable VAT. With high daytime self-consumption, payback is typically faster than an equivalent residential system.

Do you carry out a structural assessment?

Yes. Every commercial project starts with a site visit and structural assessment. A qualified engineer reviews roof type and load capacity and, where available, 12 months of half-hourly meter data to design around your actual demand.

Who installs it, and do you handle the paperwork?

Most installations are carried out under our own MCS registration. Further afield we use installers working under our MCS registration, and the certificate and workmanship warranty remain ours. We handle all paperwork, grid approvals, MCS certification and AIA modelling guidance for your accountant.