Fox ESS T4-G3 vs Fronius Primo GEN24 4.0 Plus
AC power: Fox ESS T4-G3 4 kW, Fronius Primo GEN24 4.0 Plus 4 kW. The Fox ESS T4-G3 is better on 4 of 9 comparable points.
Who wins where
- Fox ESS T4-G3
- Fronius Primo GEN24 4.0 Plus
Biggest differences
| Fact | T4-G3 | Primo GEN24 4.0 Plus |
|---|---|---|
| MPPT voltage max. | 1,000 V | 530 V |
| Max. input current per MPPT | 14 A | 22 A |
| MPPT voltage min. | 140 V | 210 V |
| Weight | 17 kg | 15.4 kg |
Score per area = position (0–100) relative to all 238 models in this category; higher is better.
| Technical specifications | Fox ESST4-G3 | FroniusPrimo GEN24 4.0 Plus |
|---|---|---|
| Performance | ||
| AC power | 4 kW 1 | 4 kW 2 |
| Max. PV array power | 6 kWp 1 | 6 kWp 2 |
| MPP trackers | 2 1 | 2 2 |
| Efficiency | ||
| Max. efficiency | 98.6 % ✓ 1 | 97.6 % 2 |
| European efficiency | 97.8 % ✓ 1 | 97.1 % 2 |
| Noise | ||
| Noise | – | 42 dB(A) 2 |
| Electrical | ||
| MPPT voltage min. | 140 V ✓ 1 | 210 V 2 |
| MPPT voltage max. | 1,000 V ✓ 1 | 530 V 2 |
| Max. input current per MPPT | 14 A 1 | 22 A ✓ 2 |
| Phases | 3 1 | 1 2 |
| Connectivity & smart | ||
| Hybrid (battery-ready) | – | Yes 2 |
| Backup power | – | Yes 2 |
| Wi-Fi / monitoring | – | Yes 2 |
| Dimensions & weight | ||
| IP rating | IP65 1 | IP66 2 |
| Width | 370 mm 1 | 474 mm 2 |
| Height | 480 mm 1 | 530 mm 2 |
| Depth | 183.5 mm 1 | 165 mm 2 |
| Weight | 17 kg 1 | 15.4 kg ✓ 2 |
Sources
- T SERIES(G3) THREE-PHASE INVERTER, V2.5 | 2026/07/03 — Fox ESS · accessed 29 Sept 2026
- Fronius Primo GEN24 & GEN24 Plus 3.0 - 6.0 kW – datasheet, EN V04 (June 2025) — Fronius International GmbH · accessed 27 Sept 2026