Solis — S6-GR1P3.6K-M
A compact, quiet entry-level string inverter for smaller residential systems — verified at 3.6kW, not the full "3K–6K" range.
Reviewed 23 August 2026
The S6-GR1P3.6K-M is the 3.6kW entry point of Solis’s Mini Series single-phase inverters — compact (310×373×160mm) and light (7.7kg), with a fanless natural-convection cooling design that keeps it quiet. Max efficiency is 97.3%, EU-weighted 96.8%.
It ships with integrated AFCI (arc-fault fire-risk protection), IP66 outdoor rating (marginally higher than the IP65 we found on other inverters reviewed here), and under 1W of night-time self-consumption. Communication is RS485 as standard, with WiFi/GPRS as optional add-ons.
One scoping note: Solis markets this as part of a broader "3K–6K" family, but the datasheet we sourced covers the 3.6K model specifically. We have not independently verified the larger models in this line — if you need 5kW or more, ask your vendor for that specific model’s datasheet rather than assuming these numbers scale up unchanged.
For Installers & Engineers
Deeper technical detail beyond the homeowner-facing summary above.
Rated output is 3.6kW — meaningfully smaller than the 5kW-class inverters (Growatt MIN 5000TL-X, Deye SUN-5K) reviewed alongside it. Confirm this matches your actual target system size before comparing specs head-to-head across our reviews.
1 MPP tracker supporting 2 strings — the inverse configuration from the Growatt unit reviewed alongside it (2 trackers, 1 string each). This Solis configuration suits two same-orientation strings combined onto one tracker better than it suits two genuinely different roof orientations.
Integrated AFCI carries a datasheet footnote: "Activation required." This is a similar honest-disclosure pattern to Growatt’s "Optional" AFCI listing — confirm with your installer that activation is completed at commissioning, not assumed.
IP66 (versus IP65 on the Growatt and Deye units reviewed here) is a marginally higher ingress-protection rating — relevant mainly for very exposed outdoor mounting locations, not a decisive factor on its own.
The Scorecard
How we scoreConversion Efficiency
97.3% max / 96.8% EU-weighted is solid but not class-leading against the 98.4% we found on the Growatt unit reviewed alongside it.
Reliability & Build
IP66 rating, wide operating range, and fanless natural-convection cooling (fewer moving parts) support a solid reliability case.
Monitoring & Software
RS485 is standard, but WiFi/GPRS remote monitoring is an optional add-on rather than built in out of the box.
Service Network & Support
Solis has real global manufacturing scale, but we did not independently confirm its India-specific retail and service network to the same depth as the more established brands reviewed here.
Value for Money
Compact, feature-complete, and reasonably positioned for its smaller 3.6kW size class — not a direct value comparison against the larger 5kW-class units reviewed alongside it.
Strengths
- Compact and lightweight (7.7kg) — the smallest of the three inverters we’ve reviewed in this batch
- Integrated AFCI fire-risk protection (subject to activation) rather than a bolt-on option
- IP66 rating and very low (<1W) night-time self-consumption
- Fanless natural-convection cooling — fewer moving parts, quieter operation
Watch-outs
- Rated output is 3.6kW — confirm this, not a larger Solis model, actually matches your target system size
- We verified only the 3.6K datasheet; larger models in Solis’s stated "3K–6K" range were not independently checked here
- Datasheet shows international/export grid codes (UK G98/G99, German VDE, South African NRS097, Thai MEA/PEA) — India-specific certification is not shown
- AFCI requires "activation" per the datasheet footnote — confirm with your installer that this is completed, not left inactive
Key Specifications
| Rated AC output | 3,600 W (3.6 kVA) |
|---|---|
| Recommended max PV power | 5,500 W |
| MPPT count / strings per tracker | 1 MPPT · 2 strings |
| MPPT voltage range | 80–500 V |
| Max / EU efficiency | 97.3% / 96.8% |
| IP rating / operating temp | IP66 · −25°C to +60°C |
| Dimensions / weight | 310×373×160mm · 7.7 kg |
| AFCI (arc-fault protection) | Integrated — activation required per datasheet footnote |
| Communication | RS485 standard; WiFi/GPRS optional |
| Certifications shown on datasheet | G98/G99, VDE-AR-N4105, EN 50549-1, NRS 097, MEA/PEA (international set) |
Specifications marked “datasheet-stated” are manufacturer figures we have not independently measured. Always confirm the exact model on its current datasheet before purchase.
Who It’s For
- Smaller residential systems (roughly 3–4kW) prioritising a compact, quiet, lightweight unit
- Buyers who want integrated AFCI rather than needing to ask if it is bolted on separately
Our Verdict
A genuinely compact, quiet, well-built inverter for smaller residential systems specifically — do not compare its numbers head-to-head against the 5kW-class units reviewed alongside it without checking the larger models in Solis’s own range, which we have not verified here. Confirm AFCI activation and India certification before buying.
Frequently Asked Questions
Is this the right inverter for a 5kW rooftop system?
No — this specific model (S6-GR1P3.6K-M) is rated for 3.6kW output. Solis markets a broader "3K–6K" family, but we only independently verified this entry model’s datasheet. Ask your vendor for the specific datasheet of a larger model if you need more capacity.
Does it have fire-risk (arc-fault) protection built in?
Yes, AFCI is listed as integrated — but the datasheet notes "activation required." Confirm with your installer that it is activated during commissioning rather than left dormant.
Can I connect two solar strings to it?
Yes — it has 1 MPP tracker supporting 2 strings, which suits two same-orientation strings combined rather than two panels facing meaningfully different directions.
Data Provenance
- Verified on
- 23 August 2026
- ALMM status
- Unknown — verify directly
- Source datasheet
- View official manufacturer datasheet
No paid rankings, no affiliate links. No manufacturer can pay for a score or a place on this page. We review published specifications and field reality against a transparent methodology — we are not a laboratory, and we never present a number as a test we did not run.