Solar monitoring data: generation, usage and exports explained

Start with the measurement boundary

Generation is electricity produced by the solar system. Consumption is electricity used by the property. Import and export describe flows across the grid connection, not all activity inside the home. An inverter can measure its own production without knowing how much a household uses. Consumption figures usually need additional metering or sensors configured for the site. A missing consumption tile does not mean the home used nothing.

Before comparing figures, open the app’s help page and note which quantities are measured and which are calculated. Ask the installer whether battery charging, separate buildings and all supply phases are included. The solar monitoring service is a relevant starting point if the measurement coverage is unclear.

A labelled solar-only example

This hypothetical one-hour period has no battery, no curtailment and negligible measurement losses. Solar produces 4 kWh while the home consumes 1.5 kWh, all during generation. The remaining 2.5 kWh is exported. The bill can show export, but cannot reveal the 1.5 kWh used behind the meter by looking at export alone.

Do not mix power with energy

A live reading of 4 kW describes power at that moment. It is not 4 kWh generated today. Sustaining 4 kW for half an hour produces 2 kWh. Real output varies throughout an interval, so a screenshot of a midday peak is not a substitute for the daily total. Compare equal periods and check the app’s time zone before judging a change.

Why the numbers may not line up

Apps may sample at different intervals, round totals or upload data late. A retailer meter and an inverter can measure at different electrical points. Battery conversion losses and whether the app displays AC or DC energy also matter. Treat a small mismatch as a question to investigate, not proof of a faulty meter. A consistently impossible flow, such as negative household consumption, warrants an installer check of measurement configuration rather than a homeowner sensor adjustment.

• Record the start/end dates and time zone used in both reports.
• Check whether the screen is live, daily, lifetime or estimated data.
• Confirm which phases and circuits the consumption measurement covers.
• Keep the original export file and screenshots rather than only a cropped total.

Use the data for a specific question

To investigate a decline, compare similar weather and seasons using the safe output-drop checklist. To reconcile billed imports and exports, read about smart-meter responsibilities. A battery creates additional flows; the battery monitoring guide explains reserve and state-of-charge behaviour without assuming a fault.

For a future system, ask for the measurement scope to be written into the solar-system design. Decide whether whole-property monitoring is needed before comparing apps on appearance alone. A useful handover explains normal seasonal expectations, account ownership and who investigates missing data.