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Fronius Primo 3.8-1 vs SG3.6RS 8 of 21 identical Swap Change inverters

Fronius Primo 3.8-1 vs Sungrow SG3.6RS

Fronius Primo 3.8-1
Fronius International
Fronius Primo 3.8-1
3.8 kW Grid-tie
Open inverter page Datasheet PDF
VS
Sungrow SG3.6RS
Sungrow
SG3.6RS
3.68 kW 97.0 % euro Grid-tie
Open inverter page Datasheet PDF
The verdict

SG3.6RS leads on the differences that matter

The largest is max dc voltage: 400 V apart. 8 of 21 comparable parameters are identical, with 11 more left out because at least one datasheet does not publish them.

See all 13 differences
How alike are they
8 of 21 comparable
parameters are identical
identical differs not published
01

What actually differs

13 of 21 parameters
Parameter Fronius Primo 3.8-1 SG3.6RS Difference
Max DC voltage 1000 V 600 V 400 V apart
Max input current per tracker 33.0 A 16.0 A 17.0 A more headroom
Max efficiency 96.7 % 97.9 % 1.2 pp more efficient
Rated AC power 3.80 kW 3.68 kW 0.12 kW apart
Weight 21.4 kg 10.0 kg 11.4 kg lighter
Weight per kW 5.6 kg/kW 2.7 kg/kW 2.9 kg/kW lighter
Max AC power 3.80 kW 3.68 kW 0.12 kW apart
Start voltage 80 V 50 V 30 V earlier start
Ingress protection NEMA 4X IP65 NEMA 4X vs IP65
Nominal AC voltage 240 V 230 V 10 V apart
MPPT voltage range 200-800 V 40-560 V 200-800 V vs 40-560 V
Dimensions 627x429x206 mm 270x410x150 mm 627x429x206 mm vs 270x410x150 mm
Cooling forced-air natural forced-air vs natural
02

Full specification

Parameter Fronius Primo 3.8-1 SG3.6RS Difference
AC output
Rated AC power 3.80 kW 3.68 kW 0.12 kW apart
Max AC power 3.80 kW 3.68 kW 0.12 kW apart
Grid connection Single-phase Single-phase Same
Nominal AC voltage 240 V 230 V 10 V apart
Max AC current 15.8 A 16.0 A Effectively the same
PV input
Max PV power - 5.40 kW Not published by Fronius International
DC/AC ratio - 1.47 Not published by Fronius International
Max DC voltage 1000 V 600 V 400 V apart
MPPT voltage range 200-800 V 40-560 V 200-800 V vs 40-560 V
Start voltage 80 V 50 V -30 V for SG3.6RS
MPP trackers 2 2 Same
Strings per tracker - 1 Not published by Fronius International
Max input current per tracker 33.0 A 16.0 A +17.0 A for Fronius Primo 3.8-1
Efficiency
European efficiency - 97.0 % Not published by Fronius International
Max efficiency 96.7 % 97.9 % +1.2 pp for SG3.6RS
CEC efficiency 95.0 % - Not published by Sungrow
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 21.4 kg 10.0 kg -11.4 kg for SG3.6RS
Weight per kW 5.6 kg/kW 2.7 kg/kW -2.9 kg/kW for SG3.6RS
Dimensions 627x429x206 mm 270x410x150 mm 627x429x206 mm vs 270x410x150 mm
Ingress protection NEMA 4X IP65 NEMA 4X vs IP65
Cooling forced-air natural forced-air vs natural
Noise - - Neither datasheet publishes this
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 Sungrow
03

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Fronius Primo 3.8-1 vs SolarEdge SE3680H (HD‑Wave, single phase)
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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.