---
title: "SolarEdge SE66.6K (Synergy, 277/480V) vs SolarEdge SE66.6K (Synergy) - secondary unit (physical) - Inverter Comparison | ComparePV"
description: "Compare SolarEdge SE66.6K (Synergy, 277/480V) 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-synergy-277-480v/solaredge-solaredge-se66-6k-synergy-secondary-unit-physical"
updated: 2026-01-16
---

# SolarEdge SE66.6K (Synergy, 277/480V) vs SolarEdge SE66.6K (Synergy) - secondary unit (physical)

One difference, none of them an advantage

The largest is dimensions: 940x315x260 mm vs 540x315x260 mm. 19 of 20 comparable parameters are identical, with 12 more left out because at least one datasheet does not publish them.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [SolarEdge SE66.6K (Synergy, 277/480V)](https://comparepv.com/inverter/solaredge-solaredge-se66-6k-synergy-277-480v) | [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 |


## Where they differ

Ranked by how much the difference matters, not by datasheet order.


| Parameter | (Synergy, 277/480V) | (Synergy) - secondary unit (physical) | Difference |
| --- | --- | --- | --- |
| Dimensions | 940x315x260 mm | 540x315x260 mm | 940x315x260 mm vs 540x315x260 mm |


## Every compared parameter


| Parameter | (Synergy, 277/480V) | (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 | 680-1000 V |
| Start voltage | - | - |
| MPP trackers | - | - |
| Strings per tracker | - | - |
| Max input current per tracker | 40.0 A | 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 |
| Weight per kW | - | 0.7 kg/kW |
| Dimensions | 940x315x260 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 (Synergy, 277/480V) vs SolarEdge SE66.6K (K66.6SE)](https://comparepv.com/compare-inverters/solaredge-solaredge-se66-6k-synergy-277-480v/solaredge-solaredge-se66-6k-k66-6se) - One difference: dimensions
- [SolarEdge SE66.6K (Synergy, 277/480V) vs SolarEdge SE66.6K (K66.6SE) - Primary unit](https://comparepv.com/compare-inverters/solaredge-solaredge-se66-6k-synergy-277-480v/solaredge-solaredge-se66-6k-k66-6se-primary-unit) - The same specification on paper
- [SolarEdge SE66.6K (Synergy, 277/480V) vs SolarEdge SE66.6K (K66.6SE) - Secondary unit](https://comparepv.com/compare-inverters/solaredge-solaredge-se66-6k-synergy-277-480v/solaredge-solaredge-se66-6k-k66-6se-secondary-unit) - One difference: dimensions


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Source: https://comparepv.com/compare-inverters/solaredge-solaredge-se66-6k-synergy-277-480v/solaredge-solaredge-se66-6k-synergy-secondary-unit-physical

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