Sineng SP-350K-INHB: Utility-Scale & Large Captive Solar Inverter

Utility-scale and large captive solar projects don't get evaluated on a spec sheet alone developers run through a checklist: system voltage compatibility, grid code compliance, monitoring granularity, cost per watt, and reliability under extreme site conditions. The Sineng SP-350K-INHB, part of the Sineng On-grid Inverters range, is built specifically to clear that checklist for 350kW-class ground-mount deployments.

Full technical specifications are in the official SP-350K-INHB datasheet, and the model is listed on the Sineng Inverters product page. For utility-scale project sizing, reach the team via Contact Us.

The Utility-Scale Solar Checklist

✓ 1500V System Compatibility

Large ground-mount projects are increasingly designed around 1500V DC architecture, since higher system voltage reduces cabling costs and losses across a sprawling site. The SP-350K-INHB is built for a max. PV input voltage of 1500V, with an MPP voltage range of 500-1500V, putting it squarely in the voltage class utility-scale design teams are already standardizing on.

✓ Grid Code Compliance Built In

Interconnection approval for a utility-scale project depends on meeting the grid operator's ride-through requirements. LVRT and HVRT (low- and high-voltage ride-through) functions are built in, along with active and reactive power control the inverter can stay connected and support the grid through a voltage disturbance rather than tripping offline and losing generation during exactly the moments grid stability matters most.

✓ String-Level Monitoring at Scale

With 6 MPPT trackers supporting up to 30 PV strings, and integrated string monitoring built in, a fault on one string doesn't get lost across a sprawling site it's flagged at the string level, cutting the time between an underperforming string and its identification considerably compared to inverters without this granularity at scale.

✓ Low System Cost Per Watt

Among Sineng On-grid Inverters, this model is built specifically for cost efficiency at scale. Supporting 30 PV strings per unit, with a max. MPPT current of 75A per tracker, means fewer inverters are needed to cover a given site capacity compared to smaller-format string inverters directly reducing the balance-of-system cost per watt for a utility-scale build, where inverter count multiplies cabling, combiner, and installation costs across the site.

✓ Reliable Operation in Extreme Site Conditions

Utility-scale sites are rarely in mild climates. The SP-350K-INHB is rated for -30°C to +60°C operation, IP66 protection, and temperature-controlled forced air cooling with an IP68-rated cooling fan built to hold rated output in the desert heat and extreme cold that characterize many large-scale Indian and export solar farm locations.

Where the SP-350K-INHB Gets Deployed

• Utility-scale IPP solar farms ground-mount projects in the tens to hundreds of MW, where inverter count and grid-code compliance directly affect project economics and approval timelines.

• Large captive industrial solar plants steel, cement, and refinery operations running open-access or captive power arrangements at a scale that outgrows commercial-class inverters entirely.

• High-DC-ratio bifacial ground-mount projects the 1500V architecture and wide MPP voltage range support the oversized, long-string layouts common on projects designed around bifacial module gain.

Quick Specs

• Max. output power: 352kW (rated 350kW), with output derating specified at 30°C, 40°C, and 51°C for accurate site planning

• Max. efficiency: 99.0%, EU efficiency 98.8%

• MPPT trackers: 6, supporting up to 30 PV strings

• Weight and footprint: 135kg, 1272×735×403mm

• Protection: IP66 enclosure, DC/AC Type II surge protection, anti-island and insulation monitoring built in

Why This Matters Within the Broader Sineng Range

Among Sineng On-grid Inverters, the SP-350K-INHB represents the utility-scale end of the lineup the same brand reliability and support relationship that covers residential and C&I projects extends up to true grid-scale deployments, so a developer working across project sizes doesn't need a separate distributor relationship for utility-scale work.

Sourcing the SP-350K-INHB Through OSG Oriana India

OSG Oriana India is the official Sineng distributor in India, supplying the SP-350K-INHB with genuine manufacturer warranty and technical support for utility-scale and large captive solar projects. See the full lineup on the Sineng product page, or contact the team for a project-specific quote.