WEG SIW700 Central Solar Inverter

The WEG SIW700 Central Solar Inverter is a utility-scale, three-phase grid-tied photovoltaic inverter designed for large solar farms and industrial solar plants, available in ratings from 500 kW to 2 MW per unit. The SIW700 targets the large C&I and utility solar market segment where individual string inverters would result in impractical numbers of units, and where the centralised design simplifies maintenance and monitoring. Each SIW700 unit incorporates multiple MPPT input channels to handle multiple PV array zones, advanced Maximum Power Point Tracking with shade-tolerant algorithms, and a high-voltage DC bus (up to 1,500 V DC) that reduces DC cable losses and increases array-to-inverter efficiency at the plant level. At 98.5% peak efficiency, the SIW700 is among the most efficient central inverters available, and its Low Voltage Ride-Through (LV-FRT) capability per IEC 61727 and Saudi Electricity Company's grid code requirements for large generators ensures uninterrupted grid contribution during transient voltage dips — a requirement for all solar plants above 10 MW connected to the Saudi 33 kV or 132 kV grid.

The SIW700 is built in a weatherproof outdoor enclosure (IP54) with integrated MV transformer option (available as a skid-mounted SIW700 + 0.69/11 kV transformer package), simplifying the electrical interface to the 11 kV or 33 kV plant collection network. The inverter's power electronics are based on IGBT technology with sinusoidal PWM modulation optimised for minimum harmonic distortion, achieving THD < 3% at rated output — below the harmonic injection limits imposed by SEC's large-generator connection code. Active and reactive power control capability (PQ control, power factor range 0.9 lead to 0.9 lag) allows the SIW700 to participate in voltage support on the local 11/33 kV grid, a requirement increasingly imposed by SEC on utility-scale solar generators under the NREP framework. Remote monitoring and SCADA integration are provided via IEC 61850 (for utility-scale substation integration) and Modbus TCP, covering both legacy SCADA systems and new smart grid platforms.

Saudi Arabia's National Renewable Energy Programme (NREP) under Vision 2030 targets 50% renewable energy by 2030, driving a pipeline of utility solar projects totalling more than 20 GW through 2030. Projects already in construction or development include Sudair 1.5 GW, Al-Shuaibah 2.6 GW, Neom 4 GW solar-wind hybrid, SABIC and ARAMCO captive solar, and SEC's own RESCO programme. Each gigawatt of solar capacity requires roughly 500–2,000 central inverter units of 500 kW–2 MW rating, representing a massive sustained procurement programme for central solar inverters. WEG's SIW700 competes directly with Sungrow, Huawei, ABB, and SMA in this market, offering the advantage of WEG's established presence in Saudi Arabia through Razz Middle East's distribution network and the availability of local technical and commissioning support.

Razz Middle East supports SIW700 projects from early technical specification through to commissioning and O&M, providing inverter data sheets and performance simulation data for project developers, EPC tender participation support, factory coordination and inspection, freight forwarding to Saudi ports, site commissioning by WEG-trained engineers, and inverter monitoring platform setup. We also provide spare parts stocking for the SIW700 to support multi-year O&M contracts. Contact Razz Middle East's project division for technical proposals on solar farm inverter supply.