---
title: "SolarEdge SE33.3K vs SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional) - Inverter Comparison | ComparePV"
description: "Compare SolarEdge SE33.3K vs SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional) side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification."
source: "https://comparepv.com/compare-inverters/solaredge-se33-3k/solaredge-solaredge-se33-3k-k33-3se-with-dc-safety-unit-optional"
updated: 2026-01-16
---

# SolarEdge SE33.3K vs SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional)

SE33.3K leads on the differences that matter

The largest is max pv power: 8.27 kW apart. 12 of 19 comparable parameters are identical, with 13 more left out because at least one datasheet does not publish them.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [SolarEdge SE33.3K](https://comparepv.com/inverter/solaredge-se33-3k) | [SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional)](https://comparepv.com/inverter/solaredge-solaredge-se33-3k-k33-3se-with-dc-safety-unit-optional) |
| Manufacturer | SolarEdge | SolarEdge |
| Rated AC power | 33.3 kW | 33.3 kW |
| Type | Grid-tie | Grid-tie |


## Where they differ

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


| Parameter | SE33.3K | SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional) | Difference |
| --- | --- | --- | --- |
| Max PV power | 58.27 kW | 50.00 kW | 8.27 kW apart |
| DC/AC ratio | 1.75 | 1.50 | +0.25 for SE33.3K |
| Weight | 32.0 kg | 48.0 kg | -16.0 kg for SE33.3K |
| Weight per kW | 1.0 kg/kW | 1.4 kg/kW | -0.5 kg/kW for SE33.3K |
| Nominal AC voltage | 400 V | 480 V | 80 V apart |
| Max AC current | 48.2 A | 40.0 A | 8.2 A apart |
| Dimensions | 558x328x273 mm | 775x315x260 mm | 558x328x273 mm vs 775x315x260 mm |


## Every compared parameter


| Parameter | SE33.3K | SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional) |
| --- | --- | --- |
| Rated AC power | 33.30 kW | 33.30 kW |
| Max AC power | 33.30 kW | 33.30 kW |
| Grid connection | 3-phase | 3-phase |
| Nominal AC voltage | 400 V | 480 V |
| Max AC current | 48.2 A | 40.0 A |
| Max PV power | 58.27 kW | 50.00 kW |
| DC/AC ratio | 1.75 | 1.50 |
| 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 |
| European efficiency | 98.0 % | 98.0 % |
| Max efficiency | - | 98.1 % |
| CEC efficiency | - | - |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 32.0 kg | 48.0 kg |
| Weight per kW | 1.0 kg/kW | 1.4 kg/kW |
| Dimensions | 558x328x273 mm | 775x315x260 mm |
| Ingress protection | IP65 | IP65 |
| Cooling | forced-air | forced-air |
| Noise | - | 55 dB |
| Max operating temperature | 60 °C | 60 °C |
| Wi-Fi | Yes | Yes |
| Ethernet | Yes | Yes |
| Arc fault protection | Yes | Yes |
| Integrated DC switch | - | Yes |
| Warranty | - | 20 yrs |


## Related comparisons

- [SolarEdge SE33.3K vs SolarEdge SE33.3K (K33.3SE) - Three Phase Inverter for 277/480V Grid](https://comparepv.com/compare-inverters/solaredge-se33-3k/solaredge-solaredge-se33-3k-k33-3se-three-phase-inverter-for-277-480v-grid) - 7 differences, the largest is max pv power
- [SolarEdge SE33.3K vs Fronius Verto 33.3](https://comparepv.com/compare-inverters/solaredge-se33-3k/fronius-international-fronius-verto-33-3) - 9 differences, the largest is max pv power
- [SolarEdge SE33.3K vs SolarEdge SE33.3KUS (KUS33.3SE)](https://comparepv.com/compare-inverters/solaredge-se33-3k/solaredge-se33-3kus-kus33-3se) - 8 differences, the largest is max pv power


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Source: https://comparepv.com/compare-inverters/solaredge-se33-3k/solaredge-solaredge-se33-3k-k33-3se-with-dc-safety-unit-optional

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