---
title: "Fronius Verto 20.0 vs SMA Solar STP 20-50 (Sunny Tripower X 20) - Inverter Comparison | ComparePV"
description: "Compare Fronius Verto 20.0 vs SMA Solar STP 20-50 (Sunny Tripower X 20) side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification."
source: "https://comparepv.com/compare-inverters/fronius-international-fronius-verto-20-0/sma-solar-stp-20-50-sunny-tripower-x-20"
updated: 2026-01-16
---

# Fronius Verto 20.0 vs SMA Solar STP 20-50 (Sunny Tripower X 20)

Fronius Verto 20.0 leads on the differences that matter

The largest is max input current per tracker: 4.0 A more headroom. 15 of 26 comparable parameters are identical, with 6 more left out because at least one datasheet does not publish them.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [Fronius Verto 20.0](https://comparepv.com/inverter/fronius-international-fronius-verto-20-0) | [SMA Solar STP 20-50 (Sunny Tripower X 20)](https://comparepv.com/inverter/sma-solar-stp-20-50-sunny-tripower-x-20) |
| Manufacturer | Fronius International | SMA Solar |
| 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 | Fronius Verto 20.0 | STP 20-50 (Sunny Tripower X 20) | Difference |
| --- | --- | --- | --- |
| Max input current per tracker | 28.0 A | 24.0 A | +4.0 A for Fronius Verto 20.0 |
| European efficiency | 98.3 % | 97.9 % | +0.4 pp for Fronius Verto 20.0 |
| Max efficiency | 98.6 % | 98.2 % | +0.4 pp for Fronius Verto 20.0 |
| Nominal AC voltage | 400 V | 230 V | 170 V apart |
| Max AC current | 30.3 A | 36.6 A | 6.3 A apart |
| MPP trackers | 4 | 3 | +1 trackers for Fronius Verto 20.0 |
| Start voltage | 150 V | 188 V | -38 V for Fronius Verto 20.0 |
| Ingress protection | IP66 | IP65 | IP66 vs IP65 |
| Noise | 56 dB | 59 dB | -2 dB for Fronius Verto 20.0 |
| MPPT voltage range | 150-870 V | 150-1000 V | 150-870 V vs 150-1000 V |
| Dimensions | 730x540x278 mm | 762x728x266 mm | 730x540x278 mm vs 762x728x266 mm |


## Every compared parameter


| Parameter | Fronius Verto 20.0 | STP 20-50 (Sunny Tripower X 20) |
| --- | --- | --- |
| 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 | 400 V | 230 V |
| Max AC current | 30.3 A | 36.6 A |
| Max PV power | 30.00 kW | 30.00 kW |
| DC/AC ratio | 1.50 | 1.50 |
| Max DC voltage | 1000 V | 1000 V |
| MPPT voltage range | 150-870 V | 150-1000 V |
| Start voltage | 150 V | 188 V |
| MPP trackers | 4 | 3 |
| Strings per tracker | 2 | 2 |
| Max input current per tracker | 28.0 A | 24.0 A |
| European efficiency | 98.3 % | 97.9 % |
| Max efficiency | 98.6 % | 98.2 % |
| CEC efficiency | - | - |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 35.2 kg | 35.0 kg |
| Weight per kW | 1.8 kg/kW | 1.8 kg/kW |
| Dimensions | 730x540x278 mm | 762x728x266 mm |
| Ingress protection | IP66 | IP65 |
| Cooling | forced-air | forced-air |
| Noise | 56 dB | 59 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 | - | 5 yrs |


## Related comparisons

- [Fronius Verto 20.0 vs Growatt MID 20KTL3-X](https://comparepv.com/compare-inverters/fronius-international-fronius-verto-20-0/growatt-mid-20ktl3-x) - 11 differences, the largest is max dc voltage
- [Fronius Verto 20.0 vs Sungrow SG20KTL-M](https://comparepv.com/compare-inverters/fronius-international-fronius-verto-20-0/sungrow-sg20ktl-m) - 10 differences, the largest is max dc voltage
- [Fronius Verto 20.0 vs Huawei SUN2000-20KTL-M2](https://comparepv.com/compare-inverters/fronius-international-fronius-verto-20-0/huawei-sun2000-20ktl-m2) - 12 differences, the largest is max dc voltage


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Source: https://comparepv.com/compare-inverters/fronius-international-fronius-verto-20-0/sma-solar-stp-20-50-sunny-tripower-x-20

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