Solar Inverter Duty Transformer Manufacturers & Suppliers

At MACROPLAST, we manufacture Outdoor, Oil Cooled, Three Phase Solar Inverter Duty Transformers (IDTs) up to 20 MVA, 33 KV Class, engineered specifically for grid-connected solar photovoltaic (PV) power plants. Designed to step up the low-voltage output of solar inverters (typically 800 V, Three Phase) to the medium-voltage grid level (11 KV / 22 KV / 33 KV), our Solar IDTs ensure efficient, safe and uninterrupted evacuation of solar power to the grid.

As one of the trusted Solar Inverter Duty Transformer Manufacturers in India, we design every unit around the harmonic spectrum and load profile of the inverter it will be paired with. In-house design, manufacturing and testing facilities let us match specific inverter OEM requirements — harmonic spectrum, dv/dt, DC bias and efficiency at partial loads — instead of adapting a standard distribution transformer to solar duty.

Being established Solar Inverter Duty Transformer Suppliers, we deliver reliable power conversion for utility-scale solar plants, solar parks and hybrid renewable projects, backed by prompt after-sales service and pan-India support.

What is a Solar Inverter Duty Transformer?

A Solar Inverter Duty Transformer is a special-purpose step-up transformer that connects the output of solar inverters to the medium-voltage distribution or transmission network. Unlike conventional distribution transformers, Solar IDTs are designed to handle:

• Harmonic-rich inverter output – Solar inverters generate voltage and current harmonics that cause additional heating. IDTs are designed with enhanced insulation and low-loss core material to withstand this harmonic loading.
• Multiple inverter inputs – IDTs are often built with two or more separate LV windings (e.g. 800 V – 800 V) to connect multiple inverters to a single transformer, with adequate electrostatic shielding between windings.
• Fluctuating load cycles – Solar generation varies from zero to full load daily. Our IDTs are thermally designed for continuous cyclic loading without degradation.
• Harsh outdoor conditions – Fully outdoor construction with weatherproof fittings, suitable for the high ambient temperatures, dust and humidity typical of solar sites.

Advantages of our Solar Inverter Duty Transformers

• Designed for harmonics: Low-loss CRGO core and optimized winding design handle inverter-generated harmonics without overheating, ensuring long service life.
• High efficiency at partial loads: Solar plants operate at variable output; our IDTs deliver excellent efficiency across the full load curve, maximizing energy yield.
• Dual / multi LV windings: Connect two or more inverters to one transformer, reducing plant BOS (Balance of System) cost.
• Electrostatic shield: Grounded shield between HV and LV windings suppresses high-frequency transients and protects inverters.
• Robust outdoor construction: Weatherproof tank with corrosion-resistant painting, suitable for the toughest solar site environments.
• Low losses, low maintenance: Oil-cooled design with proven sealing ensures minimal maintenance over the plant’s 25-year life.
• Proven reliability: Type-tested designs, manufactured under strict quality control and routine tested as per IS / IEC standards.

Standard Fittings & Accessories

• HV & LV Bushings / Cable Boxes
• Conservator with Magnetic Oil Level Gauge (MOG)
• Silica Gel Breather
• Buchholz Relay (double float, with alarm & trip contacts)
• Oil Temperature Indicator (OTI) with alarm & trip contacts
• Winding Temperature Indicator (WTI) with alarm & trip contacts
• Pressure Relief Valve / Device (PRV)
• Off Circuit Tap Changer with external handle, locking & position indicator
• Radiators / Pressed steel fins for cooling
• Drain valve, filter valve & oil sampling valve
• Air release plug
• Bi-directional flanged rollers
• Lifting lugs, jacking pads & haulage holes
• Earthing terminals (2 Nos.)
• Rating & diagram plate (stainless steel / anodized aluminium)
• Marshalling box (weatherproof, IP55) for alarm / trip wiring
• Thermometer pocket
• Explosion vent (where applicable)

Optional Accessories

• On Load Tap Changer (OLTC) with RTCC panel
• Neutral CT / Bushing CTs for protection & metering
• Magnetic oil level gauge with low oil level alarm
• Fibre-optic winding temperature sensors
• Corrosion-resistant painting for coastal / desert environments (C4 / C5)

Applications of MACROPLAST Solar Inverter Duty Transformers

• Utility-scale ground-mounted solar PV power plants
• Solar parks and hybrid (solar + wind + BESS) power projects
• Rooftop and captive solar installations with central inverters
• Grid interconnection substations for renewable energy

Why Choose MACROPLAST?

Related Transformer Range

Rating and duty decide which machine fits: distribution units step down to consumer voltage, power transformers handle bulk transfer, and inverter duty units are built for harmonic-rich solar output. Related options include 1000 KVA 33 KV distribution transformers for industrial and township loads, package substations where a factory-built compact substation is required, transformer repair and maintenance for units already in service, and distribution transformers from 10 KVA to 5000 KVA up to 33 KV. Browse the complete Macroplast product range to compare every model side by side.

Quality Assurance & Testing

Every unit is built at our ISO 9001:2015-certified works in Greater Noida, where Macroplast has designed, manufactured and tested transformers since 1983, with most components — including tanks and steel fabrication — produced in house. Each transformer is routine tested in our dedicated high-voltage and temperature-rise testing laboratory before dispatch, and type tests are carried out in government-accredited laboratories against the relevant IS and IEC standards. See our manufacturing and testing infrastructure for plant and laboratory details, or read more about Macroplast Transformers.