A complete plug-in solar kit should be described as an exact configuration, with its included parts and required extras made clear. Do not start from the photograph alone. Use the product list, selected options and written seller answers to establish what would arrive and what you would still need to arrange.
Complete should mean complete for your chosen configuration, not simply everything shown in the first product photo.
Pin down the exact configuration
Record the product name, model identifier and selected options before comparing two listings. A page can offer several panel counts, cable choices or mounts under one title. Save the itemised basket or quotation, not just the promotional image.
Our suggested starting question is: what would arrive if I bought this exact option today? Ask the seller to identify included components and any items pictured only for illustration. Keep the reply with the quotation so substitutions can be checked before dispatch.
Ask for an itemised contents list
A plug-in device needs documentation for the actual combination being sold. The government specification and Energy Saving Trust checklist are useful starting points for product and installation checks; our list below is a purchasing worksheet, not a design specification.
- Panel quantity, exact models, dimensions and weights.
- The named inverter or complete device and its connection documentation.
- The mounting option intended for your location, with installed dimensions.
- Supplied cables, their lengths and any configuration restrictions.
- Instructions, warranty documents and the details needed for registration.
Separate essentials from optional extras
Ask whether monitoring needs an extra gateway, an account, an internet connection or a subscription. Do not assume a screen image in the listing means the shown monitoring service is included indefinitely.
Treat a battery-compatible claim as a question, not an included battery. Likewise, a mounting choice labelled universal should be checked against your actual surface. Resolve missing essentials before comparing optional accessories or accepting a limited-time discount.
Compare the delivered, usable package
Add delivery, required mounting components and any necessary professional work to the selected kit price. Mark unresolved costs as unknown. A lower advertised price with unpriced essentials is not yet demonstrably cheaper.
For example, a fictional £520 bundle plus £90 delivery and £110 mounting totals £720 before any other work. A fictional £680 offer including those items is cheaper on that defined scope. These are arithmetic examples, not current offers or estimates for your home.
Once both sellers have confirmed the same scope, compare service, returns and warranty conditions as well as the total.
Plug-in solar kit contents: compare the exact checkout configuration
Keep a copy of the selected product name, mounting variant, price and basket contents. A product page may show one attractive starting price while its photographs combine accessories sold separately. A statement about the whole product range is not confirmation of what your selected box contains.
Send each shortlisted seller the same requirements. Ask them to complete the missing amounts below and identify anything you must arrange independently. An unanswered cost stays unknown; it does not become free.
| Line item | Evidence to retain | Do not assume |
|---|---|---|
| Panels and inverter | Exact models, quantities and output rating | Two similarly named kits contain the same equipment. |
| Mounting | Selected ground, wall or balcony version and supplied fixings | All mounting options are included in the advertised price. |
| Delivery | Charge and availability for your address | A national service is free or has local stock. |
| Fitting and electrics | Tasks, contractor, location coverage and agreed price | Included brackets mean included fitting or a suitable socket. |
| Warranty and returns | Component terms, contact and return-transport arrangements | One headline warranty covers every part or every cost. |
Worked example: a cheaper box can cost more to finish
These two fictional quotes supply the same equipment and mounting configuration. The invented extra costs illustrate how to compare prices; they are not typical installation charges or offers from real suppliers.
- Offer B costs £50 less on this stated scope despite the higher headline price.
- Neither quote prices any socket work. That missing amount is not zero and must be resolved for the property.
- Keep delivery coverage separate from fitting coverage, and confirm which company is responsible for each.
| Cost item | Offer A | Offer B |
|---|---|---|
| Advertised kit | £450 | £550 |
| Delivery | £50 | Included |
| Required mounting kit | £100 | Included |
| Ballast or fixings | £40 | £40 |
| Total before electrical work | £640 | £590 |
Common questions
Does a product photograph show everything included?
Not reliably. Check the contents for the selected variant, especially where one page sells different mounts or panel counts. Ask the seller to identify illustrative accessories. Save the selected configuration and itemised order rather than using the first image as evidence of what you purchased. Solar warranties, returns and after-sales support: what to compare.
Should I accept a different panel or inverter as a substitution?
Ask for the revised complete model and documents before agreeing. A replacement component can change dimensions, instructions or the evidence supporting the device configuration. Similar wattage or branding is not enough to establish equivalence. Keep the agreed configuration with your order record. How to register plug-in solar and check your device.
General information, checked against the linked sources on 6 September 2026. Rules and products can change. For a decision about your property, use the current official guidance and appropriate professional advice. Tell us about a correction. How we prepare our guides.
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