--- title: "SolarEdge SE33.3KUS (KUS33.3SE) vs SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional) - Inverter Comparison | ComparePV" description: "Compare SolarEdge SE33.3KUS (KUS33.3SE) 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-se33-3kus-kus33-3se/solaredge-solaredge-se33-3k-k33-3se-with-dc-safety-unit-optional" updated: 2026-01-16 --- # SolarEdge SE33.3KUS (KUS33.3SE) vs SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional) 5 differences, and they point both ways The largest is max pv power: 5.00 kW apart. 14 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 SE33.3KUS (KUS33.3SE)](https://comparepv.com/inverter/solaredge-se33-3kus-kus33-3se) | [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 | SE33.3KUS (KUS33.3SE) | SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional) | Difference | | --- | --- | --- | --- | | Max PV power | 45.00 kW | 50.00 kW | 5.00 kW apart | | Weight | 45.0 kg | 48.0 kg | -3.0 kg for SE33.3KUS (KUS33.3SE) | | DC/AC ratio | 1.35 | 1.50 | +0.15 for SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional) | | Ingress protection | NEMA 3R | IP65 | NEMA 3R vs IP65 | | Dimensions | 540x315x260 mm | 775x315x260 mm | 540x315x260 mm vs 775x315x260 mm | ## Every compared parameter | Parameter | SE33.3KUS (KUS33.3SE) | 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 | 480 V | 480 V | | Max AC current | 40.0 A | 40.0 A | | Max PV power | 45.00 kW | 50.00 kW | | DC/AC ratio | 1.35 | 1.50 | | 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 % | | Max efficiency | - | 98.1 % | | CEC efficiency | 98.5 % | - | | Battery input | - | - | | Battery voltage | - | - | | Max charge current | - | - | | Backup power | - | - | | Weight | 45.0 kg | 48.0 kg | | Weight per kW | 1.4 kg/kW | 1.4 kg/kW | | Dimensions | 540x315x260 mm | 775x315x260 mm | | Ingress protection | NEMA 3R | IP65 | | Cooling | forced-air | forced-air | | Noise | 55 dB | 55 dB | | Max operating temperature | 60 °C | 60 °C | | Wi-Fi | - | Yes | | Ethernet | Yes | Yes | | Arc fault protection | Yes | Yes | | Integrated DC switch | Yes | Yes | | Warranty | 20 yrs | 20 yrs | ## Related comparisons - [SolarEdge SE33.3KUS (KUS33.3SE) vs SolarEdge SE33.3K](https://comparepv.com/compare-inverters/solaredge-se33-3kus-kus33-3se/solaredge-se33-3k) - 8 differences, the largest is max pv power - [SolarEdge SE33.3KUS (KUS33.3SE) vs SolarEdge SE33.3K (K33.3SE) - Three Phase Inverter for 277/480V Grid](https://comparepv.com/compare-inverters/solaredge-se33-3kus-kus33-3se/solaredge-solaredge-se33-3k-k33-3se-three-phase-inverter-for-277-480v-grid) - 3 differences, the largest is max pv power - [SolarEdge SE33.3KUS (KUS33.3SE) vs Fronius Verto 33.3](https://comparepv.com/compare-inverters/solaredge-se33-3kus-kus33-3se/fronius-international-fronius-verto-33-3) - 7 differences, the largest is max pv power --- Source: https://comparepv.com/compare-inverters/solaredge-se33-3kus-kus33-3se/solaredge-solaredge-se33-3k-k33-3se-with-dc-safety-unit-optional Not in this file, on the page: a written summary generated on request.