--- title: "SMA Solar STP 20-US-50 (Sunny Tripower X-US 20) vs Sungrow SG20KTL-M - Inverter Comparison | ComparePV" description: "Compare SMA Solar STP 20-US-50 (Sunny Tripower X-US 20) vs Sungrow SG20KTL-M side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification." source: "https://comparepv.com/compare-inverters/sma-solar-stp-20-us-50-sunny-tripower-x-us-20/sungrow-sg20ktl-m" updated: 2026-01-16 --- # SMA Solar STP 20-US-50 (Sunny Tripower X-US 20) vs Sungrow SG20KTL-M 11 differences, and they point both ways The largest is max dc voltage: 100 V 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 | [SMA Solar STP 20-US-50 (Sunny Tripower X-US 20)](https://comparepv.com/inverter/sma-solar-stp-20-us-50-sunny-tripower-x-us-20) | [Sungrow SG20KTL-M](https://comparepv.com/inverter/sungrow-sg20ktl-m) | | Manufacturer | SMA Solar | Sungrow | | Rated AC power | 20 kW | 20 kW | | Type | Grid-tie | Grid-tie | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | STP 20-US-50 (Sunny Tripower X-US 20) | SG20KTL-M | Difference | | --- | --- | --- | --- | | Max DC voltage | 1000 V | 1100 V | 100 V apart | | Max input current per tracker | 24.0 A | 22.0 A | +2.0 A for STP 20-US-50 (Sunny Tripower X-US 20) | | Weight | 35.0 kg | 24.0 kg | -11.0 kg for SG20KTL-M | | Weight per kW | 1.8 kg/kW | 1.2 kg/kW | -0.6 kg/kW for SG20KTL-M | | Nominal AC voltage | 480 V | 400 V | 80 V apart | | Max AC current | 24.0 A | 31.9 A | 7.9 A apart | | Start voltage | 188 V | 250 V | -62 V for STP 20-US-50 (Sunny Tripower X-US 20) | | MPP trackers | 3 | 2 | +1 trackers for STP 20-US-50 (Sunny Tripower X-US 20) | | Ingress protection | Type 4X (UL 50E) | IP65 | Type 4X (UL 50E) vs IP65 | | MPPT voltage range | 150-1000 V | 200-1000 V | 150-1000 V vs 200-1000 V | | Dimensions | 762x728x266 mm | 485x370x210 mm | 762x728x266 mm vs 485x370x210 mm | ## Every compared parameter | Parameter | STP 20-US-50 (Sunny Tripower X-US 20) | SG20KTL-M | | --- | --- | --- | | Rated AC power | 20.00 kW | 20.00 kW | | Max AC power | 20.00 kW | 20.00 kW | | Grid connection | 3-phase | 3-phase | | Nominal AC voltage | 480 V | 400 V | | Max AC current | 24.0 A | 31.9 A | | Max PV power | 30.00 kW | - | | DC/AC ratio | 1.50 | - | | Max DC voltage | 1000 V | 1100 V | | MPPT voltage range | 150-1000 V | 200-1000 V | | Start voltage | 188 V | 250 V | | MPP trackers | 3 | 2 | | Strings per tracker | 2 | 2 | | Max input current per tracker | 24.0 A | 22.0 A | | European efficiency | - | 98.3 % | | Max efficiency | - | 98.6 % | | CEC efficiency | 97.5 % | - | | Battery input | - | - | | Battery voltage | - | - | | Max charge current | - | - | | Backup power | - | - | | Weight | 35.0 kg | 24.0 kg | | Weight per kW | 1.8 kg/kW | 1.2 kg/kW | | Dimensions | 762x728x266 mm | 485x370x210 mm | | Ingress protection | Type 4X (UL 50E) | IP65 | | Cooling | forced-air | forced-air | | Noise | 59 dB | - | | Max operating temperature | 60 °C | 60 °C | | Wi-Fi | Yes | - | | Ethernet | Yes | - | | Arc fault protection | Yes | - | | Integrated DC switch | Yes | Yes | | Warranty | 10 yrs | - | ## Related comparisons - [SMA Solar STP 20-US-50 (Sunny Tripower X-US 20) vs Growatt MID 20KTL3-X](https://comparepv.com/compare-inverters/sma-solar-stp-20-us-50-sunny-tripower-x-us-20/growatt-mid-20ktl3-x) - 12 differences, the largest is warranty - [SMA Solar STP 20-US-50 (Sunny Tripower X-US 20) vs Fronius Verto 20.0](https://comparepv.com/compare-inverters/sma-solar-stp-20-us-50-sunny-tripower-x-us-20/fronius-international-fronius-verto-20-0) - 9 differences, the largest is max input current per tracker - [SMA Solar STP 20-US-50 (Sunny Tripower X-US 20) vs Huawei SUN2000-20KTL-M2](https://comparepv.com/compare-inverters/sma-solar-stp-20-us-50-sunny-tripower-x-us-20/huawei-sun2000-20ktl-m2) - 13 differences, the largest is max dc voltage - [Sungrow SG20KTL-M vs Huawei SUN2000-20KTL-M0](https://comparepv.com/compare-inverters/sungrow-sg20ktl-m/huawei-sun2000-20ktl-m0) - 8 differences, the largest is max ac power --- Source: https://comparepv.com/compare-inverters/sma-solar-stp-20-us-50-sunny-tripower-x-us-20/sungrow-sg20ktl-m Not in this file, on the page: a written summary generated on request.