---
title: "Growatt MID 20KTL3-X vs SMA Solar STP 20-US-50 (Sunny Tripower X-US 20) - Inverter Comparison | ComparePV"
description: "Compare Growatt MID 20KTL3-X vs SMA Solar STP 20-US-50 (Sunny Tripower X-US 20) side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification."
source: "https://comparepv.com/compare-inverters/growatt-mid-20ktl3-x/sma-solar-stp-20-us-50-sunny-tripower-x-us-20"
updated: 2026-01-16
---

# Growatt MID 20KTL3-X vs SMA Solar STP 20-US-50 (Sunny Tripower X-US 20)

STP 20-US-50 (Sunny Tripower X-US 20) leads on the differences that matter

The largest is warranty: 5 yrs longer. 9 of 21 comparable parameters are identical, with 11 more left out because at least one datasheet does not publish them.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [Growatt MID 20KTL3-X](https://comparepv.com/inverter/growatt-mid-20ktl3-x) | [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) |
| Manufacturer | Growatt | 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 | MID 20KTL3-X | STP 20-US-50 (Sunny Tripower X-US 20) | Difference |
| --- | --- | --- | --- |
| Warranty | 5 yrs | 10 yrs | +5 yrs for STP 20-US-50 (Sunny Tripower X-US 20) |
| Max DC voltage | 1100 V | 1000 V | 100 V apart |
| Max AC power | 22.00 kW | 20.00 kW | 2.00 kW apart |
| Weight | 23.0 kg | 35.0 kg | -12.0 kg for MID 20KTL3-X |
| Weight per kW | 1.1 kg/kW | 1.8 kg/kW | -0.6 kg/kW for MID 20KTL3-X |
| Nominal AC voltage | 400 V | 480 V | 80 V apart |
| Max AC current | 31.9 A | 24.0 A | 7.9 A apart |
| Start voltage | 250 V | 188 V | -62 V for STP 20-US-50 (Sunny Tripower X-US 20) |
| MPP trackers | 2 | 3 | +1 trackers for STP 20-US-50 (Sunny Tripower X-US 20) |
| Ingress protection | IP65 | Type 4X (UL 50E) | IP65 vs Type 4X (UL 50E) |
| MPPT voltage range | 200-1000 V | 150-1000 V | 200-1000 V vs 150-1000 V |
| Dimensions | 395x525x222 mm | 762x728x266 mm | 395x525x222 mm vs 762x728x266 mm |


## Every compared parameter


| Parameter | MID 20KTL3-X | STP 20-US-50 (Sunny Tripower X-US 20) |
| --- | --- | --- |
| Rated AC power | 20.00 kW | 20.00 kW |
| Max AC power | 22.00 kW | 20.00 kW |
| Grid connection | 3-phase | 3-phase |
| Nominal AC voltage | 400 V | 480 V |
| Max AC current | 31.9 A | 24.0 A |
| Max PV power | 30.00 kW | 30.00 kW |
| DC/AC ratio | 1.50 | 1.50 |
| Max DC voltage | 1100 V | 1000 V |
| MPPT voltage range | 200-1000 V | 150-1000 V |
| Start voltage | 250 V | 188 V |
| MPP trackers | 2 | 3 |
| Strings per tracker | - | 2 |
| Max input current per tracker | - | 24.0 A |
| European efficiency | 98.6 % | - |
| Max efficiency | 98.8 % | - |
| CEC efficiency | - | 97.5 % |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 23.0 kg | 35.0 kg |
| Weight per kW | 1.1 kg/kW | 1.8 kg/kW |
| Dimensions | 395x525x222 mm | 762x728x266 mm |
| Ingress protection | IP65 | Type 4X (UL 50E) |
| Cooling | forced-air | forced-air |
| Noise | - | 59 dB |
| Max operating temperature | 60 °C | 60 °C |
| Wi-Fi | Yes | Yes |
| Ethernet | Yes | Yes |
| Arc fault protection | - | Yes |
| Integrated DC switch | Yes | Yes |
| Warranty | 5 yrs | 10 yrs |


## Related comparisons

- [Growatt MID 20KTL3-X vs Fronius Verto 20.0](https://comparepv.com/compare-inverters/growatt-mid-20ktl3-x/fronius-international-fronius-verto-20-0) - 11 differences, the largest is max dc voltage
- [Growatt MID 20KTL3-X vs Sungrow SG20KTL-M](https://comparepv.com/compare-inverters/growatt-mid-20ktl3-x/sungrow-sg20ktl-m) - 4 differences, the largest is max ac power
- [Growatt MID 20KTL3-X vs Huawei SUN2000-20KTL-M2](https://comparepv.com/compare-inverters/growatt-mid-20ktl3-x/huawei-sun2000-20ktl-m2) - 8 differences, the largest is weight


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Source: https://comparepv.com/compare-inverters/growatt-mid-20ktl3-x/sma-solar-stp-20-us-50-sunny-tripower-x-us-20

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