Skip to main content Skip to main navigation Skip to site search

Latest news

Green roof, solar array: a view of the urban climate strategy ahead

Heat and heavy rain – solar green roofs becoming a frontline climate tool

-

As heatwaves and storms intensify across Europe, combining green roofs with rooftop solar is gaining traction as a practical way to cool buildings, manage rainfall and generate clean power where it is needed most.

Pricing in the residential battery segment was mixed in June

Battery Index – commercial demand picks up as prices ease

-

sun.store data show pricing in the 60–120 kWh category falling sharply in June, driven by a shift in product mix rather than demand, even as commercial activity rebounded in the 20–30 kWh range.

James Xie is managing director of SAJ Electric

SAJ Electric: innovative storage solutions for residential & C&I

-

PV Guided Tours: The HS5 all-in-one offers a complete way to power private homes. It brings together solar, battery storage, a wallbox and backup power in a single unit, with an AI-based energy manager orchestrating the individual components.

Energy Decentral's Innovation Awards spotlight new and enhanced solutions, including those for on-farm solar supply

Energy Decentral – apply now for the Innovation Awards

-

The DLG is accepting submissions for its 2026 Innovation Awards until 31 July, offering Energy Decentral exhibitors in Hanover a broad marketing package and stronger presence at the fair.

TOPCon bifacial prices dipped in June

June PV Index: premium modules hit new highs, confidence holds firm

-

Premium module segments hit new highs in June as back contact and full black extended their runs, while buyer sentiment stayed firmly expansionary despite a slight easing in the PV PMI to 67, according to data from sun.store.

Latest videos

More videos

PV on TourPV Guided Tours


 

markets

financing

hybrid generators

inverter

mounting

What is photovoltaics?

Photovoltaics (PV) refers to the generation of electrical energy from sunlight. At the heart of this process are the solar-active semiconductors known as solar cells, which capture sunlight and convert it directly into electricity.

From a technical standpoint, a PV system or solar installation functions as a generator. Here, individual solar cells are combined into a solar module, which is protected from the elements. These modules are then assembled into a larger solar generator, which can be mounted on rooftopsfaçadesopen ground or specially designed structures. The electricity generated is direct current (DC), which is converted into alternating current (AC) by an inverter. This AC power can be used directly on site or fed into the public grid via the building’s connection. The electricity is typically supplied to the local utility or grid operator.

Larger PV systems installed on open land are often called solar parks. These feed power into the grid via dedicated transformers and switchgear. In many countries special Acts and regulations govern remuneration for solar power, whether via feed-in tariffs or market premiums for direct sales to third parties.

Self-consumption can be increased by using solar power for heating waterroom heating, air conditioning or refrigeration. Battery storage systems help by storing surplus solar electricity for later use. These so-called solar batteries improve system reliability, especially when solar output dips.

Not all incoming sunlight is converted into electricity. The conversion rate depends on the intensity and wavelength of the incoming light spectrum. This ratio between usable electrical output and the maximum available solar radiation is known as efficiency.

The performance of a solar generator or storage system is defined by its output. When multiplied by the number of sunshine hours, this gives the solar yield – the amount of electricity generated per day, month or year. In addition to charging and discharging power, solar batteries are also rated by their capacity, or the amount of energy they can store. Power is measured in kilowatts (kW) or megawatts (MW), while energy and yield are expressed in kilowatt-hours (kWh) or megawatt-hours (MWh). (HS)