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STP 20-US-50 (Sunny Tripower X-US 20) vs Fronius Verto 20.0 15 of 24 identical Swap Change inverters

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

SMA Solar STP 20-US-50 (Sunny Tripower X-US 20)
SMA Solar
STP 20-US-50 (Sunny Tripower X-US 20)
20 kW Grid-tie
Open inverter page Datasheet PDF
VS
Fronius Verto 20.0
Fronius International
Fronius Verto 20.0
20 kW 98.3 % euro Grid-tie
Open inverter page Datasheet PDF
The verdict

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 24 comparable parameters are identical, with 8 more left out because at least one datasheet does not publish them.

See all 9 differences
How alike are they
15 of 24 comparable
parameters are identical
identical differs not published
01

What actually differs

9 of 24 parameters
Parameter STP 20-US-50 (Sunny Tripower X-US 20) Fronius Verto 20.0 Difference
Max input current per tracker 24.0 A 28.0 A 4.0 A more headroom
Nominal AC voltage 480 V 400 V 80 V apart
Max AC current 24.0 A 30.3 A 6.3 A apart
MPP trackers 3 4 1 tracker more
Start voltage 188 V 150 V 38 V earlier start
Ingress protection Type 4X (UL 50E) IP66 Type 4X (UL 50E) vs IP66
Noise 59 dB 56 dB 2 dB quieter
MPPT voltage range 150-1000 V 150-870 V 150-1000 V vs 150-870 V
Dimensions 762x728x266 mm 730x540x278 mm 762x728x266 mm vs 730x540x278 mm
02

Full specification

Parameter STP 20-US-50 (Sunny Tripower X-US 20) Fronius Verto 20.0 Difference
AC output
Rated AC power 20.00 kW 20.00 kW Same
Max AC power 20.00 kW 20.00 kW Same
Grid connection 3-phase 3-phase Same
Nominal AC voltage 480 V 400 V 80 V apart
Max AC current 24.0 A 30.3 A 6.3 A apart
PV input
Max PV power 30.00 kW 30.00 kW Same
DC/AC ratio 1.50 1.50 Same
Max DC voltage 1000 V 1000 V Same
MPPT voltage range 150-1000 V 150-870 V 150-1000 V vs 150-870 V
Start voltage 188 V 150 V -38 V for Fronius Verto 20.0
MPP trackers 3 4 +1 trackers for Fronius Verto 20.0
Strings per tracker 2 2 Same
Max input current per tracker 24.0 A 28.0 A +4.0 A for Fronius Verto 20.0
Efficiency
European efficiency - 98.3 % Not published by SMA Solar
Max efficiency - 98.6 % Not published by SMA Solar
CEC efficiency 97.5 % - Not published by Fronius International
Battery
Battery input - - Neither datasheet publishes this
Battery voltage - - Neither datasheet publishes this
Max charge current - - Neither datasheet publishes this
Backup power - - Neither datasheet publishes this
Physical
Weight 35.0 kg 35.2 kg Effectively the same
Weight per kW 1.8 kg/kW 1.8 kg/kW Same
Dimensions 762x728x266 mm 730x540x278 mm 762x728x266 mm vs 730x540x278 mm
Ingress protection Type 4X (UL 50E) IP66 Type 4X (UL 50E) vs IP66
Cooling forced-air forced-air Same
Noise 59 dB 56 dB -2 dB for Fronius Verto 20.0
Max operating temperature 60 °C 60 °C Same
Connectivity and safety
Wi-Fi Yes Yes Same
Ethernet Yes Yes Same
Arc fault protection Yes Yes Same
Integrated DC switch Yes Yes Same
Warranty
Warranty 10 yrs - Not published by Fronius International
03

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04

Written summary

Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate.