Delta refines three-phase string inverter for efficency and quiet

An update of its 140kVA inverter has been introduced by Delta. The M125HV Gen2 solar photovoltaic (PV) string inverter is designed for large ground-mounted solar power plants. It offers 99.1 per cent peak efficiency and is quieter than the earlier version, confirms the company.

The M125HV Gen2 offers the same maximum output as its predecessor but now operates at a quieter level – 71.5 dB(A) – yet still offers peak efficiency of 99.1 per cent. It accommodates input voltages ranging between 860 and 1,500V DC with a maximum sporadic voltage of 1,600V. Up to 20 strings can be attached using Amphenol connectors, enabling it to be used as part of utility-scale, ground-mounted installations.

The high input voltages means that it can reduce the amount of current cables need to transport, which allows installers to use smaller gauge wire and minimise energy loss.

The M125HV Gen2 is IP65-rated and uses Type-2 surge protection devices on the input and output sides. By avoiding the use of electrolytic capacitors, a longer service life may be possible, says Delta. The PV string inverter uses intelligent cooling which combines natural convection with quieter active ventilation.

There is remote control and monitoring via Fieldbus and the aluminium housing has IP65 protection and the protection class II terminal box has robust screw terminals on the AC side. The all-in-one design has two mechanical DC disconnectors, eliminates the need for electrolytic capacitors and has a data point collection for string monitoring and I-V curve creation.

Delta was founded in 1971. It provides switching power supplies and thermal management products and has a portfolio of smart energy-saving systems and solutions in the fields of industrial automation, building automation, telecomms power, data centre infrastructure, EV charging, renewable energy, energy storage and display.

The company’s mission statement is: “To provide innovative, clean and energy-efficient solutions for a better tomorrow”. The company says it leverages its core competence in high-efficiency power electronics and its CSR-embedded business model to address key environmental issues, such as climate change.

Delta serves customers through its sales offices, R&D centres and manufacturing facilities spread across five continents.

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