---
title: "SMA Solar STP 12-50 (Sunny Tripower X 12) vs Sungrow SG12RT-20 - Inverter Comparison | ComparePV"
description: "Compare SMA Solar STP 12-50 (Sunny Tripower X 12) vs Sungrow SG12RT-20 side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification."
source: "https://comparepv.com/compare-inverters/sma-solar-stp-12-50-sunny-tripower-x-12/sungrow-sg12rt-20"
updated: 2026-01-16
---

# SMA Solar STP 12-50 (Sunny Tripower X 12) vs Sungrow SG12RT-20

SG12RT-20 leads on the differences that matter

The largest is european efficiency: 0.5 pp more efficient. 9 of 20 comparable parameters are identical, with 12 more left out because at least one datasheet does not publish them.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [SMA Solar STP 12-50 (Sunny Tripower X 12)](https://comparepv.com/inverter/sma-solar-stp-12-50-sunny-tripower-x-12) | [Sungrow SG12RT-20](https://comparepv.com/inverter/sungrow-sg12rt-20) |
| Manufacturer | SMA Solar | Sungrow |
| Rated AC power | 12 kW | 12 kW |
| Type | Grid-tie | Grid-tie |


## Where they differ

Ranked by how much the difference matters, not by datasheet order.


| Parameter | STP 12-50 (Sunny Tripower X 12) | SG12RT-20 | Difference |
| --- | --- | --- | --- |
| European efficiency | 97.6 % | 98.1 % | +0.5 pp for SG12RT-20 |
| Max DC voltage | 1000 V | 1100 V | 100 V apart |
| Weight | 35.0 kg | 17.0 kg | -18.0 kg for SG12RT-20 |
| Weight per kW | 2.9 kg/kW | 1.4 kg/kW | -1.5 kg/kW for SG12RT-20 |
| Max input current per tracker | 24.0 A | 25.0 A | +1.0 A for SG12RT-20 |
| Max efficiency | 98.2 % | 98.5 % | +0.3 pp for SG12RT-20 |
| Nominal AC voltage | 230 V | 400 V | 170 V apart |
| MPP trackers | 3 | 2 | +1 trackers for STP 12-50 (Sunny Tripower X 12) |
| MPPT voltage range | 150-1000 V | 160-1000 V | 150-1000 V vs 160-1000 V |
| Strings per tracker | 2 | 1 | 1 string apart |
| Dimensions | 762x728x266 mm | 480x370x195 mm | 762x728x266 mm vs 480x370x195 mm |


## Every compared parameter


| Parameter | STP 12-50 (Sunny Tripower X 12) | SG12RT-20 |
| --- | --- | --- |
| Rated AC power | 12.00 kW | 12.00 kW |
| Max AC power | 12.00 kW | 12.00 kW |
| Grid connection | 3-phase | 3-phase |
| Nominal AC voltage | 230 V | 400 V |
| Max AC current | 20.0 A | 20.0 A |
| Max PV power | 18.00 kW | - |
| DC/AC ratio | 1.50 | - |
| Max DC voltage | 1000 V | 1100 V |
| MPPT voltage range | 150-1000 V | 160-1000 V |
| Start voltage | 188 V | 180 V |
| MPP trackers | 3 | 2 |
| Strings per tracker | 2 | 1 |
| Max input current per tracker | 24.0 A | 25.0 A |
| European efficiency | 97.6 % | 98.1 % |
| Max efficiency | 98.2 % | 98.5 % |
| CEC efficiency | - | - |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 35.0 kg | 17.0 kg |
| Weight per kW | 2.9 kg/kW | 1.4 kg/kW |
| Dimensions | 762x728x266 mm | 480x370x195 mm |
| Ingress protection | IP65 | 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 | 5 yrs | - |


## Related comparisons

- [SMA Solar STP 12-50 (Sunny Tripower X 12) vs Growatt MOD 12KTL3-X](https://comparepv.com/compare-inverters/sma-solar-stp-12-50-sunny-tripower-x-12/growatt-mod-12ktl3-x) - 13 differences, the largest is european efficiency
- [SMA Solar STP 12-50 (Sunny Tripower X 12) vs Growatt MOD 12KTL3-X2(Pro)](https://comparepv.com/compare-inverters/sma-solar-stp-12-50-sunny-tripower-x-12/growatt-mod-12ktl3-x2-pro) - 15 differences, the largest is european efficiency
- [SMA Solar STP 12-50 (Sunny Tripower X 12) vs Sungrow SG12KTL-M](https://comparepv.com/compare-inverters/sma-solar-stp-12-50-sunny-tripower-x-12/sungrow-sg12ktl-m) - 13 differences, the largest is european efficiency
- [Sungrow SG12RT-20 vs GoodWe GW12KLN-DT](https://comparepv.com/compare-inverters/sungrow-sg12rt-20/goodwe-gw12kln-dt) - 6 differences, the largest is max dc voltage


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Source: https://comparepv.com/compare-inverters/sma-solar-stp-12-50-sunny-tripower-x-12/sungrow-sg12rt-20

Not in this file, on the page: a written summary generated on request.