--- title: "Fronius Verto 17.5 Plus vs Growatt WIT 18K-HU - Inverter Comparison | ComparePV" description: "Compare Fronius Verto 17.5 Plus vs Growatt WIT 18K-HU side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification." source: "https://comparepv.com/compare-inverters/fronius-international-fronius-verto-17-5-plus/growatt-wit-18k-hu" updated: 2026-01-16 --- # Fronius Verto 17.5 Plus vs Growatt WIT 18K-HU 15 differences, and they point both ways The largest is rated ac power: 0.50 kW apart. 11 of 26 comparable parameters are identical, with 6 more left out because at least one datasheet does not publish them. ## The two inverters | Attribute | A | B | | --- | --- | --- | | Inverter | [Fronius Verto 17.5 Plus](https://comparepv.com/inverter/fronius-international-fronius-verto-17-5-plus) | [Growatt WIT 18K-HU](https://comparepv.com/inverter/growatt-wit-18k-hu) | | Manufacturer | Fronius International | Growatt | | Rated AC power | 17.5 kW | 18 kW | | Type | Hybrid | Hybrid | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | Fronius Verto 17.5 Plus | WIT 18K-HU | Difference | | --- | --- | --- | --- | | Rated AC power | 17.50 kW | 18.00 kW | 0.50 kW apart | | European efficiency | 97.5 % | 97.0 % | +0.5 pp for Fronius Verto 17.5 Plus | | Max input current per tracker | 28.0 A | 40.0 A | +12.0 A for WIT 18K-HU | | Max AC power | 17.50 kW | 18.00 kW | 0.50 kW apart | | Max PV power | 26.25 kW | 36.00 kW | 9.75 kW apart | | DC/AC ratio | 1.50 | 2.00 | +0.50 for WIT 18K-HU | | Max charge current | 50 A | 420 A | +370 A for WIT 18K-HU | | Weight | 43.0 kg | 55.0 kg | -12.0 kg for Fronius Verto 17.5 Plus | | Max efficiency | 98.1 % | 97.6 % | +0.5 pp for Fronius Verto 17.5 Plus | | Weight per kW | 2.5 kg/kW | 3.1 kg/kW | -0.6 kg/kW for Fronius Verto 17.5 Plus | | MPP trackers | 3 | 2 | +1 trackers for Fronius Verto 17.5 Plus | | Start voltage | 150 V | 180 V | -30 V for Fronius Verto 17.5 Plus | | MPPT voltage range | 150-870 V | 150-850 V | 150-870 V vs 150-850 V | | Battery voltage | 150-700 | 40-60V | 150-700 vs 40-60V | | Dimensions | 865x574x279 mm | 695x475x254 mm | 865x574x279 mm vs 695x475x254 mm | ## Every compared parameter | Parameter | Fronius Verto 17.5 Plus | WIT 18K-HU | | --- | --- | --- | | Rated AC power | 17.50 kW | 18.00 kW | | Max AC power | 17.50 kW | 18.00 kW | | Grid connection | 3-phase | 3-phase | | Nominal AC voltage | 400 V | 400 V | | Max AC current | 26.5 A | - | | Max PV power | 26.25 kW | 36.00 kW | | DC/AC ratio | 1.50 | 2.00 | | Max DC voltage | 1000 V | 1000 V | | MPPT voltage range | 150-870 V | 150-850 V | | Start voltage | 150 V | 180 V | | MPP trackers | 3 | 2 | | Strings per tracker | 2 | 2 | | Max input current per tracker | 28.0 A | 40.0 A | | European efficiency | 97.5 % | 97.0 % | | Max efficiency | 98.1 % | 97.6 % | | CEC efficiency | - | - | | Battery input | Yes | Yes | | Battery voltage | 150-700 | 40-60V | | Max charge current | 50 A | 420 A | | Backup power | - | - | | Weight | 43.0 kg | 55.0 kg | | Weight per kW | 2.5 kg/kW | 3.1 kg/kW | | Dimensions | 865x574x279 mm | 695x475x254 mm | | Ingress protection | IP66 | IP66 | | Cooling | forced-air | forced-air | | Noise | 57 dB | 55 dB | | Max operating temperature | 60 °C | 60 °C | | Wi-Fi | Yes | Yes | | Ethernet | Yes | - | | Arc fault protection | Yes | - | | Integrated DC switch | Yes | Yes | | Warranty | - | - | ## Related comparisons - [Fronius Verto 17.5 Plus vs Growatt MID 17KTL3-XH](https://comparepv.com/compare-inverters/fronius-international-fronius-verto-17-5-plus/growatt-mid-17ktl3-xh) - 16 differences, the largest is rated ac power - [Fronius Verto 17.5 Plus vs Huawei SUN5000-17K-MB0](https://comparepv.com/compare-inverters/fronius-international-fronius-verto-17-5-plus/huawei-sun5000-17k-mb0) - 16 differences, the largest is rated ac power - [Fronius Verto 17.5 Plus vs Huawei SUN2000-17K-MB0](https://comparepv.com/compare-inverters/fronius-international-fronius-verto-17-5-plus/huawei-sun2000-17k-mb0) - 17 differences, the largest is rated ac power - [Growatt WIT 18K-HU vs Ginlong Solis S6-EH1P18K03-NV-YD-L](https://comparepv.com/compare-inverters/growatt-wit-18k-hu/ginlong-solis-s6-eh1p18k03-nv-yd-l) - 13 differences, the largest is max dc voltage --- Source: https://comparepv.com/compare-inverters/fronius-international-fronius-verto-17-5-plus/growatt-wit-18k-hu Not in this file, on the page: a written summary generated on request.