Understand the system before changing it.

Existing solar not performing as expected?

Record the inverter make, model, displayed message and when you first noticed a change. Compare like-for-like periods where possible: weather, shading and household demand affect what you see in an app. A low reading alone does not identify a faulty panel. Keep installer records and any monitoring history available for the professional who assesses the system.

Electrical work is only part of the system

Solar arrays, inverters, batteries and the household installation need to work together. Diagnosis may involve the original installer, a system specialist and an electrician. Ask who will handle each part and confirm compatibility before changing equipment. Do not open inverter or battery enclosures, disconnect solar cables or climb onto a roof to investigate.

Adding storage or planning a new installation

Start with your electricity use, the intended benefit and the available roof or installation space. A battery for evening use is not necessarily a backup-power system. If backup matters, ask exactly which circuits would operate during a grid outage and what additional design is needed. Avoid accepting production, savings or payback promises without the underlying assumptions.

Apartments, roofs and permissions

For an apartment, establish ownership and authorised use of the proposed roof area before requesting a detailed design. Discuss safe access, roof condition, cable routes, equipment location and any approvals with the relevant professionals. The proposal should set out equipment, responsibilities, documentation and aftercare, not just a headline panel count.

Common questions