---
title: "SolarEdge SE66.6K (K66.6SE) - Secondary unit vs SolarEdge SE66.6K (Synergy) - secondary unit (physical) - Inverter Comparison | ComparePV"
description: "Compare SolarEdge SE66.6K (K66.6SE) - Secondary unit vs SolarEdge SE66.6K (Synergy) - secondary unit (physical) side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification."
source: "https://comparepv.com/compare-inverters/solaredge-solaredge-se66-6k-k66-6se-secondary-unit/solaredge-solaredge-se66-6k-synergy-secondary-unit-physical"
updated: 2026-01-16
---

# SolarEdge SE66.6K (K66.6SE) - Secondary unit vs SolarEdge SE66.6K (Synergy) - secondary unit (physical)

Identical on every published parameter

All 20 comparable parameters agree, with 12 more left out because at least one datasheet does not publish them. Two records this alike are usually one inverter sold under two names, or two ratings of one platform - decide on price, on the warranty terms and on who you would rather buy from.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [SolarEdge SE66.6K (K66.6SE) - Secondary unit](https://comparepv.com/inverter/solaredge-solaredge-se66-6k-k66-6se-secondary-unit) | [SolarEdge SE66.6K (Synergy) - secondary unit (physical)](https://comparepv.com/inverter/solaredge-solaredge-se66-6k-synergy-secondary-unit-physical) |
| Manufacturer | SolarEdge | SolarEdge |
| Rated AC power | 66.6 kW | 66.6 kW |
| Type | Grid-tie | Grid-tie |


## Every compared parameter


| Parameter | (K66.6SE) - Secondary unit | (Synergy) - secondary unit (physical) |
| --- | --- | --- |
| Rated AC power | 66.60 kW | 66.60 kW |
| Max AC power | 66.60 kW | 66.60 kW |
| Grid connection | 3-phase | 3-phase |
| Nominal AC voltage | 480 V | 480 V |
| Max AC current | 80.0 A | 80.0 A |
| Max PV power | 90.00 kW | 90.00 kW |
| DC/AC ratio | 1.35 | 1.35 |
| Max DC voltage | 1000 V | 1000 V |
| MPPT voltage range | - | 680-1000 V |
| Start voltage | - | - |
| MPP trackers | - | - |
| Strings per tracker | - | - |
| Max input current per tracker | - | 40.0 A |
| European efficiency | 98.0 % | 98.0 % |
| Max efficiency | 98.1 % | 98.1 % |
| CEC efficiency | - | - |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 45.0 kg | 45.0 kg |
| Weight per kW | 0.7 kg/kW | 0.7 kg/kW |
| Dimensions | 540x315x260 mm | 540x315x260 mm |
| Ingress protection | IP65 | IP65 |
| Cooling | forced-air | forced-air |
| Noise | 60 dB | 60 dB |
| Max operating temperature | 60 °C | 60 °C |
| Wi-Fi | - | - |
| Ethernet | Yes | Yes |
| Arc fault protection | Yes | Yes |
| Integrated DC switch | Yes | Yes |
| Warranty | - | - |


## Related comparisons

- [SolarEdge SE66.6K (K66.6SE) - Secondary unit vs SolarEdge SE66.6K (K66.6SE)](https://comparepv.com/compare-inverters/solaredge-solaredge-se66-6k-k66-6se-secondary-unit/solaredge-solaredge-se66-6k-k66-6se) - The same specification on paper
- [SolarEdge SE66.6K (K66.6SE) - Secondary unit vs SolarEdge SE66.6K (K66.6SE) - Primary unit](https://comparepv.com/compare-inverters/solaredge-solaredge-se66-6k-k66-6se-secondary-unit/solaredge-solaredge-se66-6k-k66-6se-primary-unit) - 2 differences, the largest is weight
- [SolarEdge SE66.6K (K66.6SE) - Secondary unit vs SolarEdge SE66.6K (Synergy, 277/480V)](https://comparepv.com/compare-inverters/solaredge-solaredge-se66-6k-k66-6se-secondary-unit/solaredge-solaredge-se66-6k-synergy-277-480v) - One difference: dimensions


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Source: https://comparepv.com/compare-inverters/solaredge-solaredge-se66-6k-k66-6se-secondary-unit/solaredge-solaredge-se66-6k-synergy-secondary-unit-physical

Not in this file, on the page: a written summary generated on request.