Solar Panel GL2

Preparing a solar panel enquiry in GL2

Gather a recent electricity bill and think about when your household uses power. Daytime use, evening use and plans for an electric vehicle can lead to different discussions about system design. Tell the installer whether the enquiry is for panels alone or includes a battery, and distinguish current needs from possible future changes.

A roof-specific design matters

A solar proposal should be based on the roof available, its orientation, shading and condition. Ask how the proposed panel layout was chosen and whether the installer needs to inspect the roof before finalising the offer. Neighbouring trees, chimneys and other obstructions should be assessed at the property; a location name alone cannot establish the likely output.

Look beyond the number of panels

Compare the proposed panel capacity, inverter, mounting arrangement and any battery specification. Ask what is included for scaffolding, cabling and electrical work. If two offers recommend different system sizes, ask each installer to explain the reason before comparing their totals. Keep product warranties separate from the installation workmanship guarantee when reviewing the paperwork.

Understand the assumptions in an estimate

Ask for the assumptions behind predicted generation and household savings, including how much electricity the household is expected to use directly. A projection is not a guaranteed return. Discuss monitoring, handover documents and the point of contact if the system reports a fault. If a battery is proposed, ask how its usable capacity and controls relate to your actual pattern of electricity use.

Preparing your solar panel brief: GL2

Use the points below where they apply to your project. They are questions to discuss with a company, not assumptions about your property or the local area.

Roof photographs

Provide clear photographs of the roof faces you want assessed. Include visible chimneys and nearby obstructions, and ask what still needs checking during a site visit.

Existing roof work

If roof repairs are already planned, tell the solar installer before agreeing an installation date. Discuss the sequence of work and which contractor is responsible for each stage.

Scaffolding access

Describe access around the building and any areas that need to remain usable. Confirm whether scaffolding is included and how its installation and removal will be coordinated.

Panel layout

Ask for a drawing showing the proposed panel positions. If quotations use different roof areas, ask the installers to explain the design choices before comparing the system totals.

Inverter location

Ask where the inverter would be installed and what access is needed around it. Discuss the proposed position during the survey rather than leaving the decision until installation day.

Backup expectations

If keeping particular equipment running during a power cut matters to you, say so explicitly. Ask whether the proposed installation provides that function and what additional arrangements it requires.

Cabling routes

Discuss where cables would run and how visible routes will be finished. If there are rooms or external features you want to avoid disturbing, identify them before the final quotation.

Product substitutions

Ask whether the named panels and inverter are the products that will be supplied. If a substitution is proposed, request the revised specification before agreeing to the change.