---
title: "Growatt MID 40KTL3-X vs SolarEdge SE66.6K (for 220V/230V line-to-line grids) - Inverter Comparison | ComparePV"
description: "Compare Growatt MID 40KTL3-X vs SolarEdge SE66.6K (for 220V/230V line-to-line grids) side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification."
source: "https://comparepv.com/compare-inverters/growatt-mid-40ktl3-x/solaredge-se66-6k-for-220v-230v-line-to-line-grids"
updated: 2026-01-16
---

# Growatt MID 40KTL3-X vs SolarEdge SE66.6K (for 220V/230V line-to-line grids)

MID 40KTL3-X leads on the differences that matter

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.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [Growatt MID 40KTL3-X](https://comparepv.com/inverter/growatt-mid-40ktl3-x) | [SolarEdge SE66.6K (for 220V/230V line-to-line grids)](https://comparepv.com/inverter/solaredge-se66-6k-for-220v-230v-line-to-line-grids) |
| Manufacturer | Growatt | SolarEdge |
| Rated AC power | 40 kW | 38.45 kW |
| Type | Grid-tie | Grid-tie |


## Where they differ

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


| Parameter | MID 40KTL3-X | SE66.6K (for 220V/230V line-to-line grids) | Difference |
| --- | --- | --- | --- |
| Rated AC power | 40.00 kW | 38.45 kW | 1.55 kW apart |
| European efficiency | 98.5 % | 98.0 % | +0.5 pp for MID 40KTL3-X |
| Max DC voltage | 1100 V | 600 V | 500 V apart |
| Max AC power | 44.00 kW | 38.45 kW | 5.55 kW apart |
| Max PV power | 60.00 kW | 67.28 kW | 7.28 kW apart |
| DC/AC ratio | 1.50 | 1.75 | +0.25 for SE66.6K (for 220V/230V line-to-line grids) |
| Max efficiency | 98.8 % | 98.3 % | +0.5 pp for MID 40KTL3-X |
| Nominal AC voltage | 400 V | 230 V | 170 V apart |
| Max AC current | 66.6 A | 96.5 A | 29.9 A apart |
| Ingress protection | IP66 | IP65 | IP66 vs IP65 |
| MPPT voltage range | 200-1000 V | 370-600 V | 200-1000 V vs 370-600 V |


## Every compared parameter


| Parameter | MID 40KTL3-X | SE66.6K (for 220V/230V line-to-line grids) |
| --- | --- | --- |
| Rated AC power | 40.00 kW | 38.45 kW |
| Max AC power | 44.00 kW | 38.45 kW |
| Grid connection | 3-phase | 3-phase |
| Nominal AC voltage | 400 V | 230 V |
| Max AC current | 66.6 A | 96.5 A |
| Max PV power | 60.00 kW | 67.28 kW |
| DC/AC ratio | 1.50 | 1.75 |
| Max DC voltage | 1100 V | 600 V |
| MPPT voltage range | 200-1000 V | 370-600 V |
| Start voltage | 250 V | - |
| MPP trackers | - | - |
| Strings per tracker | 2 | - |
| Max input current per tracker | 26.0 A | - |
| European efficiency | 98.5 % | 98.0 % |
| Max efficiency | 98.8 % | 98.3 % |
| CEC efficiency | - | - |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 30.5 kg | - |
| Weight per kW | 0.8 kg/kW | - |
| Dimensions | 435x580x230 mm | - |
| Ingress protection | IP66 | IP65 |
| Cooling | forced-air | forced-air |
| Noise | - | 67 dB |
| Max operating temperature | 60 °C | 60 °C |
| Wi-Fi | Yes | Yes |
| Ethernet | Yes | Yes |
| Arc fault protection | Yes | Yes |
| Integrated DC switch | Yes | Yes |
| Warranty | 5 yrs | - |


## Related comparisons

- [Growatt MID 40KTL3-X vs Huawei SUN2000-40KTL-M3](https://comparepv.com/compare-inverters/growatt-mid-40ktl3-x/huawei-sun2000-40ktl-m3) - 7 differences, the largest is max ac power
- [Growatt MID 40KTL3-X vs Solis-40K](https://comparepv.com/compare-inverters/growatt-mid-40ktl3-x/ginlong-solis-solis-40k) - 7 differences, the largest is max pv power
- [Growatt MID 40KTL3-X vs Sungrow SG40CX-P2](https://comparepv.com/compare-inverters/growatt-mid-40ktl3-x/sungrow-sg40cx-p2) - 10 differences, the largest is max input current per tracker


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Source: https://comparepv.com/compare-inverters/growatt-mid-40ktl3-x/solaredge-se66-6k-for-220v-230v-line-to-line-grids

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