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STP 20-50 (Sunny Tripower X 20) vs SG20KTL-M 8 of 20 identical Swap Change inverters

SMA Solar STP 20-50 (Sunny Tripower X 20) vs Sungrow SG20KTL-M

SMA Solar STP 20-50 (Sunny Tripower X 20)
SMA Solar
STP 20-50 (Sunny Tripower X 20)
20 kW 97.9 % euro Grid-tie
Open inverter page Datasheet PDF
VS
Sungrow
SG20KTL-M
20 kW 98.3 % euro Grid-tie
Open inverter page Datasheet PDF
The verdict

12 differences, and they point both ways

The largest is max dc voltage: 100 V apart. 8 of 20 comparable parameters are identical, with 12 more left out because at least one datasheet does not publish them.

See all 12 differences
How alike are they
8 of 20 comparable
parameters are identical
identical differs not published
01

What actually differs

12 of 20 parameters
Parameter STP 20-50 (Sunny Tripower X 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 more headroom
European efficiency 97.9 % 98.3 % 0.4 pp more efficient
Weight 35.0 kg 24.0 kg 11.0 kg lighter
Max efficiency 98.2 % 98.6 % 0.4 pp more efficient
Weight per kW 1.8 kg/kW 1.2 kg/kW 0.6 kg/kW lighter
Nominal AC voltage 230 V 400 V 170 V apart
Max AC current 36.6 A 31.9 A 4.7 A apart
Start voltage 188 V 250 V 62 V earlier start
MPP trackers 3 2 1 tracker more
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
02

Full specification

Parameter STP 20-50 (Sunny Tripower X 20) SG20KTL-M 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 230 V 400 V 170 V apart
Max AC current 36.6 A 31.9 A 4.7 A apart
PV input
Max PV power 30.00 kW - Not published by Sungrow
DC/AC ratio 1.50 - Not published by Sungrow
Max DC voltage 1000 V 1100 V 100 V apart
MPPT voltage range 150-1000 V 200-1000 V 150-1000 V vs 200-1000 V
Start voltage 188 V 250 V -62 V for STP 20-50 (Sunny Tripower X 20)
MPP trackers 3 2 +1 trackers for STP 20-50 (Sunny Tripower X 20)
Strings per tracker 2 2 Same
Max input current per tracker 24.0 A 22.0 A +2.0 A for STP 20-50 (Sunny Tripower X 20)
Efficiency
European efficiency 97.9 % 98.3 % +0.4 pp for SG20KTL-M
Max efficiency 98.2 % 98.6 % +0.4 pp for SG20KTL-M
CEC efficiency - - Neither datasheet publishes this
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 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
Dimensions 762x728x266 mm 485x370x210 mm 762x728x266 mm vs 485x370x210 mm
Ingress protection IP65 IP65 Same
Cooling forced-air forced-air Same
Noise 59 dB - Not published by Sungrow
Max operating temperature 60 °C 60 °C Same
Connectivity and safety
Wi-Fi Yes - Not published by Sungrow
Ethernet Yes - Not published by Sungrow
Arc fault protection Yes - Not published by Sungrow
Integrated DC switch Yes Yes Same
Warranty
Warranty 5 yrs - Not published by Sungrow
03

More useful comparisons

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SMA Solar STP 20-50 (Sunny Tripower X 20) vs Fronius Verto 20.0
11 differences, the largest is max input current per tracker
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Huawei
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14 differences, the largest is max dc voltage
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Huawei
Sungrow SG20KTL-M vs Huawei SUN2000-20KTL-M0
8 differences, the largest is max ac power
04

Written summary

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