Buying Solar Equipment Without an Installer: A UK Guide to the Direct-Supply Route

A UK Guide to the Direct-Supply Route

Most people assume going solar means signing up with one company that supplies and fits everything as a single package. But there is another route that is growing fast in the UK: buying your equipment directly from an authorised dealer and arranging installation separately. It gives you more control over the components, the quality and the cost. Here is how the direct-supply route works, and what to consider before you take it.

Why buy equipment directly? With a traditional installer package, you take whatever panels, inverter and battery that company chooses to stock — and the equipment cost is bundled invisibly into one quote.

• Component choice: Buying direct means you pick the brands — the exact panels, inverter and battery — rather than being limited to one installer's range.
• Transparent pricing: You see exactly what the hardware costs and what the labour costs, separately.
• No lock-in: You are not tied to a single company's stock, lead times or markup.

This route suits two groups especially well:

• Off-grid and vehicle conversions: For campervans, motorhomes, boats, cabins and remote builds, there is often no grid connection involved at all — so a self-supply approach is the natural choice. (See our guide to solar power for motorhomes and campervans.)
• Homeowners managing their own project: If you are comfortable coordinating trades, you can source the equipment and bring in your own qualified installer.

Do you still need a qualified installer? For a grid-connected home system: yes. Any solar and battery system that connects to the UK grid must be installed by a suitably qualified electrician, and for the installation to qualify for the Smart Export Guarantee it must be MCS-certified. The good news is that nothing stops you from supplying your own equipment and hiring an MCS-certified installer to fit and certify it — many will happily do exactly that.

For a purely off-grid system with no grid connection (a campervan, a remote cabin, a boat), the rules are different and a self-install is often perfectly feasible, provided the DC and AC work is done safely and to standard.

The paperwork: G98 and G99 If your system connects to the grid, your installer must notify or apply to your Distribution Network Operator (DNO):

• G98 is a simpler notification process for smaller systems (broadly up to 3.68kW per phase).
• G99 is a full application required for larger systems, which must be approved before the system is commissioned.

We cover this in detail in our guide to G98 vs G99 grid connections. The key point: an MCS-certified installer handles this paperwork as part of the job, so buying your own equipment does not leave you stranded with the admin.

A sensible step-by-step

1. Work out your system size based on your roof, energy use and goals.
2. Check your supply type — single-phase or three-phase — so you buy the right inverter.
3. Choose and order your equipment from an authorised dealer (so warranties are valid and genuine).
4. Find an MCS-certified installer willing to fit customer-supplied equipment, and confirm they will handle MCS certification and the DNO application.
5. Register for SEG once you have your MCS certificate and smart meter.

Why "authorised dealer" matters When you buy direct, the source of your equipment is critical. Buying from an authorised UK supplier helps ensure the manufacturer warranty is intact and valid — something that is often lost on grey-market or end-of-line clearance stock. As an authorised UK dealer or authorised distribution partner for the brands we stock — including AIKO, Enphase, Fox ESS, LONGi, Sunsynk, Sharp, TBB Power and Photonic Universe — the products we supply carry their full manufacturer warranty.

The Verdict The direct-supply route puts you in control: you choose the components, you see the real costs, and you keep your options open — while still getting a properly certified, grid-compliant installation when you need one. For off-grid and vehicle projects, it is often the only sensible way to build. For homeowners, it is a transparent alternative to the one-size-fits-all package.

Ready to build your system your way? Browse our full range of Solar Panels, Inverters and Battery Storage, or contact us for help specifying the right components.

This article is general guidance, not installation advice. Grid-connected solar and battery installations must comply with current UK wiring regulations and DNO requirements, and should always be carried out by a suitably qualified, MCS-certified installer. Brand names are the property of their respective manufacturers.