Fox ESS H3-5.0-Smart vs Fronius Primo 5.0-1
AC power: Fox ESS H3-5.0-Smart 5 kW, Fronius Primo 5.0-1 5 kW. The Fox ESS H3-5.0-Smart is better on 4 of 9 comparable points.
Who wins where
- Fox ESS H3-5.0-Smart
- Fronius Primo 5.0-1
Biggest differences
| Fact | H3-5.0-Smart | Primo 5.0-1 |
|---|---|---|
| Max. input current per MPPT | 20 A | 12 A |
| Weight | 34 kg | 21.5 kg |
| MPP trackers | 3 | 2 |
| MPPT voltage min. | 120 V | 80 V |
| MPPT voltage max. | 950 V | 800 V |
Score per area = position (0–100) relative to all 238 models in this category; higher is better.
| Technical specifications | Fox ESSH3-5.0-Smart | FroniusPrimo 5.0-1 |
|---|---|---|
| Performance | ||
| AC power | 5 kW 1 | 5 kW 2 |
| MPP trackers | 3 ✓ 1 | 2 2 |
| Efficiency | ||
| Max. efficiency | 97.3 % 1 | 98.1 % ✓ 2 |
| European efficiency | 97.2 % ✓ 1 | 97.1 % 2 |
| Noise | ||
| Noise | 40 dB(A) 1 | – |
| Electrical | ||
| MPPT voltage min. | 120 V 1 | 80 V ✓ 2 |
| MPPT voltage max. | 950 V ✓ 1 | 800 V 2 |
| Max. input current per MPPT | 20 A ✓ 1 | 12 A 2 |
| Connectivity & smart | ||
| Hybrid (battery-ready) | Yes 1 | – |
| Backup power | Yes 1 | – |
| Wi-Fi / monitoring | Yes 1 | Yes 2 |
| Dimensions & weight | ||
| IP rating | IP65 1 | – |
| Width | 600 mm 1 | 431 mm 2 |
| Height | 450 mm 1 | 645 mm 2 |
| Depth | 226 mm 1 | 204 mm 2 |
| Weight | 34 kg 1 | 21.5 kg ✓ 2 |
| Warranty & lifespan | ||
| Warranty | 10 years 1 | – |
Sources
- H3 Smart THREE-PHASE HYBRID INVERTER, V1.2 | 2025/07/02 — Fox ESS · accessed 29 Sept 2026
- FRONIUS PRIMO, v19 Dec 2022 — Fronius · accessed 2 Oct 2026