--- title: "SolarEdge SE66.6K (for 220V/230V line-to-line grids) vs Sungrow SG40CX-P2 - Inverter Comparison | ComparePV" description: "Compare SolarEdge SE66.6K (for 220V/230V line-to-line grids) vs Sungrow SG40CX-P2 side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification." source: "https://comparepv.com/compare-inverters/solaredge-se66-6k-for-220v-230v-line-to-line-grids/sungrow-sg40cx-p2" updated: 2026-01-16 --- # SolarEdge SE66.6K (for 220V/230V line-to-line grids) vs Sungrow SG40CX-P2 11 differences, and they point both ways The largest is rated ac power: 1.55 kW apart. 7 of 18 comparable parameters are identical, with 14 more left out because at least one datasheet does not publish them. ## The two inverters | Attribute | A | B | | --- | --- | --- | | Inverter | [SolarEdge SE66.6K (for 220V/230V line-to-line grids)](https://comparepv.com/inverter/solaredge-se66-6k-for-220v-230v-line-to-line-grids) | [Sungrow SG40CX-P2](https://comparepv.com/inverter/sungrow-sg40cx-p2) | | Manufacturer | SolarEdge | Sungrow | | Rated AC power | 38.45 kW | 40 kW | | Type | Grid-tie | Grid-tie | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | SE66.6K (for 220V/230V line-to-line grids) | SG40CX-P2 | Difference | | --- | --- | --- | --- | | Rated AC power | 38.45 kW | 40.00 kW | 1.55 kW apart | | Max DC voltage | 600 V | 1100 V | 500 V apart | | Max AC power | 38.45 kW | 44.00 kW | 5.55 kW apart | | Max PV power | 67.28 kW | 56.00 kW | 11.28 kW apart | | DC/AC ratio | 1.75 | 1.40 | +0.35 for SE66.6K (for 220V/230V line-to-line grids) | | European efficiency | 98.0 % | 98.3 % | +0.3 pp for SG40CX-P2 | | Nominal AC voltage | 230 V | 400 V | 170 V apart | | Max AC current | 96.5 A | 66.9 A | 29.6 A apart | | Max efficiency | 98.3 % | 98.5 % | +0.2 pp for SG40CX-P2 | | Ingress protection | IP65 | IP66 | IP65 vs IP66 | | MPPT voltage range | 370-600 V | 160-1000 V | 370-600 V vs 160-1000 V | ## Every compared parameter | Parameter | SE66.6K (for 220V/230V line-to-line grids) | SG40CX-P2 | | --- | --- | --- | | Rated AC power | 38.45 kW | 40.00 kW | | Max AC power | 38.45 kW | 44.00 kW | | Grid connection | 3-phase | 3-phase | | Nominal AC voltage | 230 V | 400 V | | Max AC current | 96.5 A | 66.9 A | | Max PV power | 67.28 kW | 56.00 kW | | DC/AC ratio | 1.75 | 1.40 | | Max DC voltage | 600 V | 1100 V | | MPPT voltage range | 370-600 V | 160-1000 V | | Start voltage | - | 200 V | | MPP trackers | - | 4 | | Strings per tracker | - | 2 | | Max input current per tracker | - | 30.0 A | | European efficiency | 98.0 % | 98.3 % | | Max efficiency | 98.3 % | 98.5 % | | CEC efficiency | - | - | | Battery input | - | - | | Battery voltage | - | - | | Max charge current | - | - | | Backup power | - | - | | Weight | - | 40.0 kg | | Weight per kW | - | 1.0 kg/kW | | Dimensions | - | 575x645x245 mm | | Ingress protection | IP65 | IP66 | | Cooling | forced-air | forced-air | | Noise | 67 dB | - | | Max operating temperature | 60 °C | 60 °C | | Wi-Fi | Yes | Yes | | Ethernet | Yes | Yes | | Arc fault protection | Yes | Yes | | Integrated DC switch | Yes | Yes | | Warranty | - | - | ## Related comparisons - [SolarEdge SE66.6K (for 220V/230V line-to-line grids) vs Growatt MID 40KTL3-X](https://comparepv.com/compare-inverters/solaredge-se66-6k-for-220v-230v-line-to-line-grids/growatt-mid-40ktl3-x) - 11 differences, the largest is rated ac power - [SolarEdge SE66.6K (for 220V/230V line-to-line grids) vs Huawei SUN2000-40KTL-M3](https://comparepv.com/compare-inverters/solaredge-se66-6k-for-220v-230v-line-to-line-grids/huawei-sun2000-40ktl-m3) - 10 differences, the largest is rated ac power - [SolarEdge SE66.6K (for 220V/230V line-to-line grids) vs Solis-40K](https://comparepv.com/compare-inverters/solaredge-se66-6k-for-220v-230v-line-to-line-grids/ginlong-solis-solis-40k) - 10 differences, the largest is rated ac power - [Sungrow SG40CX-P2 vs Sungrow SG40CX](https://comparepv.com/compare-inverters/sungrow-sg40cx-p2/sungrow-sg40cx) - 6 differences, the largest is max input current per tracker --- Source: https://comparepv.com/compare-inverters/solaredge-se66-6k-for-220v-230v-line-to-line-grids/sungrow-sg40cx-p2 Not in this file, on the page: a written summary generated on request.