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SE66.6K (for 220V/230V line-to-line grids) vs SG40CX-P2 7 of 18 identical Swap Change inverters

SolarEdge SE66.6K (for 220V/230V line-to-line grids) vs Sungrow SG40CX-P2

SolarEdge SE66.6K (for 220V/230V line-to-line grids)
SolarEdge
SE66.6K (for 220V/230V line-to-line grids)
38.45 kW 98.0 % euro Grid-tie
Open inverter page Datasheet PDF
VS
Sungrow SG40CX-P2
Sungrow
SG40CX-P2
40 kW 98.3 % euro Grid-tie
Open inverter page Datasheet PDF
The verdict

11 differences, and they point both ways

The largest is rated ac power: 1.55 kW apart. 7 of 18 comparable parameters are identical, with 14 more left out because at least one datasheet does not publish them.

See all 11 differences
How alike are they
7 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

11 of 18 parameters
Parameter SE66.6K (for 220V/230V line-to-line grids) SG40CX-P2 Difference
Rated AC power 38.45 kW 40.00 kW 1.55 kW apart
Max DC voltage 600 V 1100 V 500 V apart
Max AC power 38.45 kW 44.00 kW 5.55 kW apart
Max PV power 67.28 kW 56.00 kW 11.28 kW apart
DC/AC ratio 1.75 1.40 0.35 more oversizing headroom
European efficiency 98.0 % 98.3 % 0.3 pp more efficient
Nominal AC voltage 230 V 400 V 170 V apart
Max AC current 96.5 A 66.9 A 29.6 A apart
Max efficiency 98.3 % 98.5 % 0.2 pp more efficient
Ingress protection IP65 IP66 IP65 vs IP66
MPPT voltage range 370-600 V 160-1000 V 370-600 V vs 160-1000 V
02

Full specification

Parameter SE66.6K (for 220V/230V line-to-line grids) SG40CX-P2 Difference
AC output
Rated AC power 38.45 kW 40.00 kW 1.55 kW apart
Max AC power 38.45 kW 44.00 kW 5.55 kW apart
Grid connection 3-phase 3-phase Same
Nominal AC voltage 230 V 400 V 170 V apart
Max AC current 96.5 A 66.9 A 29.6 A apart
PV input
Max PV power 67.28 kW 56.00 kW 11.28 kW apart
DC/AC ratio 1.75 1.40 +0.35 for SE66.6K (for 220V/230V line-to-line grids)
Max DC voltage 600 V 1100 V 500 V apart
MPPT voltage range 370-600 V 160-1000 V 370-600 V vs 160-1000 V
Start voltage - 200 V Not published by SolarEdge
MPP trackers - 4 Not published by SolarEdge
Strings per tracker - 2 Not published by SolarEdge
Max input current per tracker - 30.0 A Not published by SolarEdge
Efficiency
European efficiency 98.0 % 98.3 % +0.3 pp for SG40CX-P2
Max efficiency 98.3 % 98.5 % +0.2 pp for SG40CX-P2
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 - 40.0 kg Not published by SolarEdge
Weight per kW - 1.0 kg/kW Not published by SolarEdge
Dimensions - 575x645x245 mm Not published by SolarEdge
Ingress protection IP65 IP66 IP65 vs IP66
Cooling forced-air forced-air Same
Noise 67 dB - Not published by Sungrow
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 - - Neither datasheet publishes this
03

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SolarEdge SE66.6K (for 220V/230V line-to-line grids) vs Solis-40K
10 differences, the largest is rated ac power
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Sungrow
Sungrow SG40CX-P2 vs Sungrow SG40CX
6 differences, the largest is max input current per tracker
04

Written summary

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