Solis Single Phase Grid-Tied Inverter: S6-GR1P(4-5)K-S

Step up from a 1-3kW rooftop and you're usually looking at a home with real daytime load, an extra AC, a home office running all day, maybe a small business on the ground floor. The S6-GR1P(4-5)K-S is Solis's answer for exactly that step up, still single-phase, still compact, but built around a higher power band and a couple of features the smaller series doesn't carry.

Technical Snapshot

Key Features of 4-5K Series

Two things on this datasheet are worth calling out specifically, since they don't show up on every Solis single-phase series. The first is integrated zero export power control, a genuinely useful feature for sites where local grid rules restrict or prohibit exporting surplus solar back to the grid. Rather than needing a separate external controller bolted onto the system, that function is built into the inverter itself.

The second is IS 16169 / IS 16221 (BIS) compliance listed directly on the datasheet, confirmation this series meets the relevant Indian Bureau of Standards requirements rather than only carrying international certifications and leaving BIS compliance to a separate process.

Beyond that, the fundamentals carry over from what you'd expect at this tier: natural convection cooling keeps the unit fanless and near-silent (under 20 dB(A), genuinely quiet for a wall-mounted unit), IP66 protection handles dust and moisture, and the transformerless topology keeps weight down to under 9kg despite the higher output than the smaller series. Power factor sits above 0.99 across the range, and total harmonic distortion stays under 3%, both of which matter more for grid compliance than most homeowners will ever need to think about, but they're the kind of spec that keeps a DISCOM interconnection approval straightforward rather than flagged for review.

Sizing: 4K, 4.6K, or 5K?

The series ships as three distinct models, S6-GR1P4K-S, S6-GR1P4.6K-S, and S6-GR1P5K-S, and picking between them comes down to your panel array size, not a guess based on your electricity bill alone. Each model has a specific recommended maximum PV input (6kW, 6.9kW, and 7.5kW respectively), so the array you're pairing it with should match that headroom rather than being sized independently and hoping it fits.

Where This Inverter Fits

This series suits homes and small commercial spaces that have outgrown a 1-3kW system's capacity but don't yet need a three-phase setup: 3-4 BHK homes with an extra AC or two, a home office with continuous daytime equipment load, or a small shop with steady daytime consumption. If your site is on a single-phase connection and your load genuinely sits in the 4-5kW band, this is the more efficient match than stepping straight up to a three-phase system you don't need yet.

It's also a common fit for homes that started with a smaller Solis on-grid system and are now expanding, since the same single-phase connection and similar mounting footprint make it a natural upgrade path rather than a full system redesign.

Get Pricing and Explore More

Pricing for the S6-GR1P(4-5)K-S depends on the specific model and current project scope, so it isn't published on this page. Contact our team for a current quote, or view the full datasheet for the complete technical specification sheet.

For the rest of Solis's on-grid range, browse the Solis on-grid inverter product page. OSG Oriana India Pvt Ltd is the authorized PAN India distributor for Solis on-grid inverters, with genuine manufacturer warranty support across the full range.

Related reading:

• Solis Single Phase Grid-Tied Inverter: S6-GR1P(1-3)K-M if your home fits the smaller end of the residential range instead

• Solis Residential Inverters for Homes for the full 1kW-20kW residential lineup

• Solis Solar Inverter: Complete Guide for the entire Solis product range, residential through utility-scale