Delta’s new generation M50A Flex three-phase solar Inverter delivers more system design flexibility

Source: press release, 4 May 2021

The M50A Flex inverter – lower weight, simpler installation, and integration of 6 MPP trackers
The M50A Flex inverter – lower weight, simpler installation, and integration of 6 MPP trackers (photo: Delta)

Delta, a global provider of power and thermal management solutions, has launched a new generation of its M50A Flex, 50 kW solar inverter for photovoltaic arrays. Following the successful launch of M70A last year, the M50A Flex inherits its new design concept. The features include six MPP trackers, Anti-PID and AC & DC Surge Protection Devices type 1 + type 2, making the M50A Flex an ideal inverter for rooftop applications.

“As we see a growing trend of having solar panels on rooftops for commercial buildings, the Delta M50A Flex is designed for versatile commercial rooftop applications. With its enhanced features to get more energy out of your PV roof and additional safety features like arc fault and reverse polarity detection, it simplifies the job of EPCs, making solar installations easier and safer, delivering energy-cost improvements to commercial building owners,” says Andreas Hoischen, Senior Director, Photovoltaic Inverters Business Unit of Delta EMEA.

Flexible PV rooftop system design
With its six MPP trackers, the M50A is primarily aimed at complex rooftop installations, giving the system designer more flexibility in the arrangement of the modules and the distribution of the module strings. Additionally, the overall input voltage range is from 200 to 1,000 VDC, but the inverter withstands input voltages up to 1,100 VDC without damage.

Anti-PID (potential-induced degradation) function benefits the system operator in avoiding this negative effect and its resulting performance losses in the solar modules. Relevant for lightning protection on building rooftops are the newly available type 1 + type 2 AC + DC surge protection devices (SPD) which can be optionally ordered as a replacement for the pre-installed type 2 SPDs.

Other new and interesting features and functions are data point collection for string monitoring and generation of I-V curves, reactive power compensation 24/7, arc fault detection, and reverse-polarity protection.

The M50A Flex comes with the standard RS485 interface and additionally provides an integrated wireless Sub-1G communication port, as well as optional Wi-Fi.

Improved form-factor, less weight, simpler installation
The heavily revised mechanical design results in an improved IP66 protection degree, a significant weight reduction of 15% to now 64 kg, and more space for routing the AC cable inside the inverter.