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SolarEdge SE66.6K (K66.6SE) - Secondary unit vs SE66.6K (Synergy, 380/400V) 12 of 20 identical Swap Change inverters

SolarEdge SE66.6K (K66.6SE) - Secondary unit vs SolarEdge SE66.6K (Synergy, 380/400V)

SolarEdge SE66.6K (K66.6SE) - Secondary unit
SolarEdge
SolarEdge SE66.6K (K66.6SE) - Secondary unit
66.6 kW 98.0 % euro Grid-tie
Open inverter page Datasheet PDF
VS
SolarEdge SE66.6K (Synergy, 380/400V)
SolarEdge
SE66.6K (Synergy, 380/400V)
66.6 kW 98.0 % euro Grid-tie
Open inverter page Datasheet PDF
The verdict

SE66.6K (Synergy, 380/400V) leads on the differences that matter

The largest is max pv power: 26.55 kW apart. 12 of 20 comparable parameters are identical, with 12 more left out because at least one datasheet does not publish them.

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

What actually differs

8 of 20 parameters
Parameter SolarEdge SE66.6K (K66.6SE) - Secondary unit SE66.6K (Synergy, 380/400V) Difference
Max PV power 90.00 kW 116.55 kW 26.55 kW apart
DC/AC ratio 1.35 1.75 0.40 more oversizing headroom
Weight 45.0 kg 32.0 kg 13.0 kg lighter
Noise 60 dB 67 dB 7 dB quieter
Nominal AC voltage 480 V 400 V 80 V apart
Max AC current 80.0 A 96.5 A 16.5 A apart
Max efficiency 98.1 % 98.3 % 0.2 pp more efficient
Dimensions 540x315x260 mm 558x328x273 mm 540x315x260 mm vs 558x328x273 mm
02

Full specification

Parameter SolarEdge SE66.6K (K66.6SE) - Secondary unit SE66.6K (Synergy, 380/400V) Difference
AC output
Rated AC power 66.60 kW 66.60 kW Same
Max AC power 66.60 kW 66.60 kW Same
Grid connection 3-phase 3-phase Same
Nominal AC voltage 480 V 400 V 80 V apart
Max AC current 80.0 A 96.5 A 16.5 A apart
PV input
Max PV power 90.00 kW 116.55 kW 26.55 kW apart
DC/AC ratio 1.35 1.75 +0.40 for SE66.6K (Synergy, 380/400V)
Max DC voltage 1000 V 1000 V Same
MPPT voltage range - 680-1000 V Not published by SolarEdge
Start voltage - - Neither datasheet publishes this
MPP trackers - - Neither datasheet publishes this
Strings per tracker - - Neither datasheet publishes this
Max input current per tracker - - Neither datasheet publishes this
Efficiency
European efficiency 98.0 % 98.0 % Same
Max efficiency 98.1 % 98.3 % +0.2 pp for SE66.6K (Synergy, 380/400V)
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 45.0 kg 32.0 kg -13.0 kg for SE66.6K (Synergy, 380/400V)
Weight per kW 0.7 kg/kW 0.5 kg/kW Effectively the same
Dimensions 540x315x260 mm 558x328x273 mm 540x315x260 mm vs 558x328x273 mm
Ingress protection IP65 IP65 Same
Cooling forced-air forced-air Same
Noise 60 dB 67 dB -7 dB for SolarEdge SE66.6K (K66.6SE) - Secondary unit
Max operating temperature 60 °C 60 °C Same
Connectivity and safety
Wi-Fi - Yes Not published by SolarEdge
Ethernet Yes Yes Same
Arc fault protection Yes Yes Same
Integrated DC switch Yes Yes Same
Warranty
Warranty - 20 yrs Not published by SolarEdge
03

More useful comparisons

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SolarEdge SE66.6K (K66.6SE) - Secondary unit vs SolarEdge SE66.6K (Synergy, 277/480V)
One difference: dimensions
04

Written summary

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