Start with energy use, not the number of panels
A solar photovoltaic system turns sunlight into electricity. Its financial value depends on how much of that electricity you can use, what you currently pay for power and the full cost of the installation. There is no single savings figure that applies to every home.
Before comparing quotations, gather several recent electricity bills, ideally covering a full year. Look at consumption in kilowatt-hours, not only the amount paid. Seasonal heating and cooling can make one month's bill very different from the next.
Why daytime consumption matters
Solar production varies through the day and year. A household that uses air conditioning, pumps or other equipment during sunny hours may use more solar electricity directly than a property that is empty until the evening.
Self-consumption means using generated electricity on site. Exported electricity is a separate matter: connection rules, permissions, metering and any export compensation must be checked locally. Do not assume that exported energy has the same value as electricity bought from the grid.
What changes the output of a system?
- Available roof or ground area, orientation and tilt.
- Shading from buildings, trees and other roof features.
- Panel and inverter selection, system configuration and temperature.
- Seasonal weather, soiling and the maintenance plan.
A site assessment should also consider the building, safe access and the existing electrical installation. These details influence what can be installed and the work included in a quotation.
Understand the savings calculation
A useful starting point is: annual value of self-consumed solar electricity, plus any confirmed export value, minus recurring operating costs. The value of self-consumed electricity depends on the applicable tariff and when you would otherwise buy that energy.
Simple payback divides the full installed cost by estimated annual net savings. This is only an initial comparison. It does not automatically account for changing tariffs, financing, degradation or future equipment replacement. Ask for the assumptions behind a forecast rather than treating it as a guarantee.
Is battery storage necessary?
A battery can move some daytime production to later use, but it adds cost and has its own capacity, efficiency and lifetime considerations. Backup during an outage is not automatic: it depends on compatible equipment and an appropriately designed installation. Ask what loads, if any, the proposed system can support when grid power is unavailable.
What to ask before accepting a quotation
- Which panel, inverter and optional battery models are included?
- How was expected production calculated, and what shading assumptions were used?
- What site, electrical and connection work is included or excluded?
- What permissions or utility arrangements need confirmation?
- What are the equipment warranty terms and future service requirements?
Matek Energy can discuss your property, energy use and installation needs. Share recent bills and available site information so the next conversation starts with your requirements, not a generic package.
Before you speak with an installer
A few details make the conversation more useful and help establish whether a site visit is needed.
- Note your property type, location and the spaces or equipment you want to improve.
- Have recent energy bills and existing equipment model details available where possible.
- Share your priorities: comfort, consumption, available space, timing and budget.
- Ask for the equipment specification, installation scope and service terms in writing.
General guidance only, not a site-specific design or a savings guarantee. Installation, electrical work and system adjustments should be assessed and carried out by suitably qualified professionals.
