Project developer GreenRock Energy has installed a total of around 2MW of PV capacity on the roofs of three agricultural buildings in Remda. With the solar PV systems, the farmer wants to reduce his high electricity consumption and thereby lower his pig breeding operation costs. From the end of 2019, two of the PV plants will feed electricity back into the grid and the third plant will be used by the farmer for self-consumption.

In just six weeks, the three agricultural buildings with a total roof area of 15,000 square metres were equipped with 7,500 solar modules Each of the modules supplies 275 watts from 60 cells. The assembly system for the solar 
modules consists of trapezoidal sheets and a substructure of 180mm aluminium rails supplied by the German company, Saytec.

The efficiency of Delta solar inverters was the deciding factor for GreenRock Energy

The installation also includes 32 string inverters from Delta Electronics. Three power classes were installed: the M88H, the M50A and the M30A. The combination of inverters of different sizes serves the purpose of taking the special features of each roof into account and making optimum use of the roof surface.

The M88H was specially developed for use in large solar parks and is available in two connection variants. It has a maximum efficiency of 98.5 per cent (EU value). "The M88H has one of the highest power outputs and is one of the most efficient string inverters on the market and ideal for large PV systems," says Martin Kofler, CEO of GreenRock Energy. GreenRock has gained good experience with Delta inverters in several projects.

The total weight of the Delta M88H inverter is only 84 kilograms. Transport and handling at the installation site do not require any special and expensive equipment. Also, its design concept, the terminal box with AC and DC surge arresters, terminals and DC disconnectors is already integrated into the device and can easily be disconnected from the power module. When the power module is replaced, the junction box with the entire cabling remains at the installation site, saving time and reducing maintenance and repair costs.While two PV plants feed the electricity produced into the grid, the owner decided to use the third PV plant for self-consumption. Soltaro's lithium iron phosphate storage system uses an efficient high voltage of 1,000 volts DC and is controlled via the energy management system from Smart 1 Solutions. The system optimizes energy distribution for private consumption and grid feed-in. The owner of the PV plant receives electricity at a fixed price, which is ten percent below the tariff that the owner has paid to an energy supplier at the time a contract was concluded. The fixed price is valid for 20 years.

GreenRock Energy AG calls this model s-plus. "Our idea is that as many people as possible can benefit from the advantages of a photovoltaic system without having to make investments," says CEO Martin Kofler. This gives customers planning security for 20 years through a fixed electricity price. From the 21st year, they will also receive a share of the plant's income.

Through the project of providing the high-efficiency inverters for GreenRock, Delta creates the financial benefits by reducing customer’s electricity bills and environmental benefits with clean solar electricity.

https://solarsolutions.delta-emea.com