Solar Inverter

Overview

A solar inverter converts the variable DC produced by photovoltaic panels into grid-compliant AC. This 50 kW transformerless three-phase string inverter tracks the array's maximum power point, conditions the energy, and feeds it to the 400 V grid at high efficiency. Skipping the line-frequency transformer cuts weight and loss; isolation and safety are instead handled by electronics and grounding. Dual MPPT inputs let two sub-arrays at different orientations operate at their own optimum.

How it works

DC from the panels enters at the DC Input Stage, which provides string fusing, DC surge protection, the isolation switch, and per-tracker current sensing. From there the Boost Converter Stage is a DC-DC converter that performs maximum-power-point tracking and lifts each array's voltage to the level the inverter bridge needs, decoupling panel voltage from grid voltage.

Boosted power accumulates on the DC-Link Capacitor Bank, a capacitor bank that buffers energy and stabilises the intermediate DC bus. The Inverter Bridge then switches this DC through IGBTs in a three-phase pulse-width-modulated pattern to synthesise AC current. The raw switched output passes through the AC Output Filter, an LCL filter and grid relay that smooth the waveform to low harmonic distortion and connect to the grid only when conditions are valid.

The Control Board runs the show: a DSP executes the MPPT, current-control, and anti-islanding algorithms and drives the IGBT gates, while the Communication Board reports yield and status over WiFi, Ethernet, or RS485. Heat from the power stages is carried away by the Cooling Fan Assembly through the finned Enclosure Assembly, an IP65 housing. Status appears on the Display Assembly, safety bonding is provided by the Grounding Set, and internal connections use a Wire Bundle harness.