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Energy

Rooftop photovoltaics

ActivePublished: 9 November 2026Updated: 9 November 2026Published
Key innovation
Shifting PV electricity generation directly onto building rooftops, enabling power to be produced at the point of consumption instead of being delivered from distant plants over the grid.
Category
Energy
Abstraction level
Technika
Operation level
Deployment
Use cases
Self-consumption in warehouses and logistics centresPowering data centres and relieving the grid connectionIndustrial and manufacturing facilitiesCommercial and office buildingsResidential buildingsReducing electricity costs

How it works

Rooftop PV modules absorb solar radiation and, through the photovoltaic effect, produce direct current. An inverter converts DC into grid-compliant AC. Energy is consumed on site first (self-consumption); surplus is sent to storage or exported to the grid (net metering/net billing), while shortfalls are covered by grid import. The mounting structure fixes the panels to the roof at an appropriate tilt with ventilation, and protective devices, disconnect switches, and monitoring oversee operation.

Problem solved

Addresses high grid electricity costs, limited grid-connection capacity, and the need to decarbonise buildings. It turns otherwise unused roof area into generation located close to the point of consumption, reducing transmission losses and dependence on grid supply.

Components

Photovoltaic modules (PV panels)Energy generation

Silicon-cell panels mounted on the roof that convert sunlight into direct current through the photovoltaic effect.

InverterDC-to-AC conversion

Device that converts the panels DC into AC compatible with the building wiring and grid. Available as a string inverter or microinverters.

Mounting / racking systemPanel mounting and orientation

Racking that fixes modules to the roof at the proper tilt while preserving ventilation and roof integrity.

Net metering / self-consumptionEnergy accounting

Billing arrangement with a bidirectional meter: energy is used on site and surplus is settled with the grid (net metering/net billing).

Energy storage (battery)Balancing and time-shifting

Optional battery that stores surplus generation for use outside sunlight hours; increases self-consumption.

Official

Monitoring systemOversight and safety

Production and health monitoring together with protective devices, disconnect switches, and grounding.