Delta Introduces New M15A/M20A Flex Inverters for Use in PV plants on Residential and Small Commercial Buildings

Optimised fan-less design delivers whisper-quiet operation

Delta, a global leader in power and thermal management solutions, presents the new multi-MPPT inverters M15A Flex and M20A Flex with outputs of 16.5kVA and 22 kVA respectively. The new inverters are an extension to the Flex series, with their design concept inherited from the M70A Flex. M15A Flex and M20A Flex address the needs of the rapidly growing market for small rooftop installations: compact, lightweight, quiet in operation (maximum 31.6 db(A)) and easy to install. With these qualities, the inverters are the perfect solution for installations in both residential and office buildings. In addition, outdoor installations are also possible thanks to their IP66 protection and an operating temperature range of -25 to +50 ºC.

“Delta’s M15A and M20A Flex have a fan-less design and are cooled exclusively by natural convection. This makes them quiet and ideal for residential and small commercial buildings where low noise is a requirement,” says Patrick Schahl, Product Manager of PVI Business Unit, Delta Electronics EMEA Region. “Aside from the technical features, customers value the importance of plant-relevant operating data, to understand their own carbon footprint, for example. Delta has extended the MyDeltaSolar app functionality and integrated a Wi-Fi module into the inverters that enables a direct connection to a smartphone or a WLAN router.”

Increased profitability through outstanding reliability
Two MPP trackers and an input voltage range of 200 to 1000 VDC ensure optimum energy yield. The three-phase inverters operate reliably and efficiently even at temperatures up to +50 ºC. To further increase reliability and prevent operational failures due to adverse installation conditions, the inverters are equipped with several key features: maximum voltage withstand up to 1100 VDC, arc fault detection and reverse polarity protection. The built-in anti-PID function prevents voltage-induced power degradation in crystalline solar cells, thereby extending their service life. In addition, replaceable AC and DC type 2 surge protection devices (SPD) are integrated; thus, string fuses are not required.

Simpler installation thanks to improved design
Installers benefit from the revised design and the low weight of about 40 kg. The mounting plate and AC and DC connectors are included.

The M15A und M20A Flex at a glance
• Whisper quiet (max. 31.6 dB(A)) thanks to natural convection
• 2 MPP trackers for more flexibility in PV system design.
• Input voltage range 200 to 1000 VDC with maximum voltage withstand up to 1100 VDC
• Lightweight IP66 housing
• Replaceable AC and DC type 2 surge protection devices
• Data point collection for string monitoring and I-V curve generation
• Arc fault detection and reverse polarity protection
• Anti-PID technology
• Reactive power compensation 24/7

The M15A and M20A Flex inverters will be available from Delta from September 2021 in selected European countries and can be ordered under part numbers M15A_220 and M20A_220.