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

Latest news

The sun heats water on Lamia’s rooftops, and new rules could make more room for PV

Greece – self-consumption recovers but grid bottlenecks persist

-

After a sweeping regulatory overhaul, business is picking up again, though connection problems are still holding many projects back, the 8th Renewable & Storage Forum in Athens heard.

Watch this space – the Refresco roof pre installation of the 18,000-module solar system

UK – Bridgwater factory to carry country’s largest solar roof

-

Installers are fitting more than 18,000 modules above the production lines at Refresco while bottling goes on day and night below. The finished array should deliver around 7.5 GWh a year.

Busy halls in Hanover, as visitors came to learn about the latest in on-farm energy supply

EnergyDecentral: storage and power marketing gain ground with farmers

-

The halls in Hanover were busy and the questions sharper than two years ago, but delayed EEG reforms and missing grid connections are keeping many farmers from committing.

Oliver Glenz (right) explains intelligent combiner boxes including insulation monitoring on string level

HIS Renewables: innovations in the DC field

-

CEO Talk: Solar parks are growing in size, with cost pressure, construction timelines and availability all becoming tighter. How can projects be implemented faster, more cost-effectively and more reliably? What role do pre-assembled cabling, aluminium cables and smart combiner boxes play? Oliver Glenz, CSO of HIS Renewables, sets out his answers.

One host, up to four clients: how Kostal’s Multi Device Control links inverters

pv Europe’s picks of the week – from plug-in power to fire watch

-

Kostal brings more inverters under one controller, while Anker Solix scales up plug-in storage. my-PV’s new app finds partner devices on its own, and Flir’s cameras spot fires before they spread.

Latest videos

More videos

PV on Tour PV 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 rooftops, façades, open 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 water, room 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)