Inverter of new and renewable energy storage system

A renewable energy storage system for a renewable energy source, the renewable energy storage system comprising:

• a maximum power point tracking (MPPT) converter connected to the renewable energy source;
• a DC link connected to the MPPT converter;
• a DC-DC converting unit connected to the DC link;
• and
• an inverting unit connected to the DC-DC converting unit, wherein the DC-DC converting unit includes:
• a half-bridge circuit including first and second unregulated switches;
• an oscillator that oscillates power output from the half-bridge circuit, and
• a transformer that converts power from the oscillator into power of a different level, wherein the first and second switches are complementary switches that operate based on a duty cycle and an operating frequency that are substantially fixed;
• wherein the MPPT converter extracts maximum available power from the new renewable energy and provides an output voltage that varies less than 10% for a predetermined operational power range of the renewable energy source, and wherein the output voltage of the DC link remains substantially constant in the predetermined operation range of the renewable energy source.