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SE66.6K (400V grid) vs SolarEdge SE66.6K (K66.6SE) - Secondary unit 11 of 17 identical Swap Change inverters

SolarEdge SE66.6K (400V grid) vs SolarEdge SE66.6K (K66.6SE) - Secondary unit

SolarEdge SE66.6K (400V grid)
SolarEdge
SE66.6K (400V grid)
66.6 kW 98.0 % euro Grid-tie
Open inverter page Datasheet PDF
VS
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
The verdict

SE66.6K (400V grid) leads on the differences that matter

The largest is max pv power: 26.55 kW apart. 11 of 17 comparable parameters are identical, with 15 more left out because at least one datasheet does not publish them.

See all 6 differences
How alike are they
11 of 17 comparable
parameters are identical
identical differs not published
01

What actually differs

6 of 17 parameters
Parameter SE66.6K (400V grid) SolarEdge SE66.6K (K66.6SE) - Secondary unit Difference
Max PV power 116.55 kW 90.00 kW 26.55 kW apart
DC/AC ratio 1.75 1.35 0.40 more oversizing headroom
Noise 67 dB 60 dB 7 dB quieter
Nominal AC voltage 400 V 480 V 80 V apart
Max AC current 96.5 A 80.0 A 16.5 A apart
Max efficiency 98.3 % 98.1 % 0.2 pp more efficient
02

Full specification

Parameter SE66.6K (400V grid) SolarEdge SE66.6K (K66.6SE) - Secondary unit 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 400 V 480 V 80 V apart
Max AC current 96.5 A 80.0 A 16.5 A apart
PV input
Max PV power 116.55 kW 90.00 kW 26.55 kW apart
DC/AC ratio 1.75 1.35 +0.40 for SE66.6K (400V grid)
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 98.3 % 98.1 % +0.2 pp for SE66.6K (400V grid)
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 Not published by SolarEdge
Weight per kW - 0.7 kg/kW Not published by SolarEdge
Dimensions - 540x315x260 mm Not published by SolarEdge
Ingress protection IP65 IP65 Same
Cooling forced-air forced-air Same
Noise 67 dB 60 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 - - Neither datasheet publishes this
03

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The same specification on paper
04

Written summary

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