These inverters extend the new Flex series, whose special design concept was successfully introduced with the M70A Flex. They are primarily aimed at the rapidly growing market for small rooftop systems: they are compact, lightweight, quiet in operation (maximum 31.6 dBA) and easy to install.

With these features, the inverters are particularly suitable for installation in residential and office buildings. However, outdoor installations are also easily possible thanks to protection class IP66 and an operating temperature range of -25 to 50 °C.

"Solar modules are constantly becoming more powerful and cheaper and are therefore being used in more and more applications. This is why PV systems for residential buildings, smaller commercial buildings and parking lot shading require inverters that are optimally adapted to these requirements. The Delta M15A and M20A Flex have a fanless design and are cooled exclusively by natural convection. This makes them particularly quiet and ideal for use in buildings where low noise levels are a prerequisite," says Patrick Schahl, Product Manager Solar Inverters at Delta EMEA.

"In addition to the purely technical features, more and more customers are attaching importance to the comprehensive recording and visualization of operating data relevant to the system. Nowadays, customers want proof that their energy consumption is climate-friendly, for example by reducing their own_{CO2 footprint}. For this purpose, Delta has functionally expanded the MyDeltaSolar app and integrated a Wi-Fi module that enables a direct connection to a smartphone or Wi-Fi router."

High profitability thanks to excellent reliability

Two MPP trackers and an input voltage range of 200 to 1000 VDC ensure optimum energy yield. The three-phase inverters work reliably and efficiently even at temperatures of up to +50 °C. To further increase reliability and prevent operational failures due to unfavorable installation conditions, the inverters are equipped with important functions: dielectric strength up to 1100 VDC, arc protection and reverse polarity protection.

The built-in anti-PID function prevents voltage-induced power degradation in crystalline solar cells and thus extends their service life. In addition, replaceable type 2 AC and DC surge arresters are integrated; string fuses are not required.

Easy installation thanks to improved design

Installers benefit from the revised design and the low weight of around 40 kg. Mounting plate, AC and DC plugs - everything is included in the scope of delivery. Extended communication options and system monitoring In addition to the Wi-Fi module already mentioned, communication is also possible via RS485. Data points for string monitoring and the generation of I-V curves are comprehensively recorded to meet the growing demands in terms of system monitoring. The M15A and M20A Flex are integrated into the MyDeltaSolar app and cloud.