Fox ESS H3-15.0-Smart vs KOSTAL PLENTICORE G3 17.5
AC power: Fox ESS H3-15.0-Smart 15 kW, KOSTAL PLENTICORE G3 17.5 17.5 kW. The KOSTAL PLENTICORE G3 17.5 is better on 6 of 13 comparable points.
Who wins where
- Fox ESS H3-15.0-Smart
- KOSTAL PLENTICORE G3 17.5
Biggest differences
| Fact | H3-15.0-Smart | PLENTICORE G3 17.5 |
|---|---|---|
| MPPT voltage min. | 120 V | 198 V |
| Max. input current per MPPT | 20 A | 30 A |
| Noise | 55 dB(A) | 39 dB(A) |
| Weight | 34 kg | 24.3 kg |
| MPPT voltage max. | 950 V | 800 V |
| AC power | 15 kW | 17.5 kW |
Score per area = position (0–100) relative to all 238 models in this category; higher is better.
| Technical specifications | Fox ESSH3-15.0-Smart | KOSTALPLENTICORE G3 17.5 |
|---|---|---|
| Performance | ||
| AC power | 15 kW 1 | 17.5 kW ✓ 2 |
| Max. PV array power | – | 26.5 kWp 2 |
| MPP trackers | 3 1 | 3 2 |
| Efficiency | ||
| Max. efficiency | 97.9 % 1 | 98.21 % ✓ 2 |
| European efficiency | 97.2 % 1 | 97.72 % ✓ 2 |
| Noise | ||
| Noise | 55 dB(A) 1 | 39 dB(A) ✓ 2 |
| Electrical | ||
| MPPT voltage min. | 120 V ✓ 1 | 198 V 2 |
| MPPT voltage max. | 950 V ✓ 1 | 800 V 2 |
| Max. input current per MPPT | 20 A 1 | 30 A ✓ 2 |
| Phases | – | 3 2 |
| Connectivity & smart | ||
| Hybrid (battery-ready) | Yes 1 | Yes 2 |
| Backup power | Yes 1 | Yes 2 |
| Wi-Fi / monitoring | Yes 1 | Yes 2 |
| Dimensions & weight | ||
| IP rating | IP65 1 | – |
| Width | 600 mm 1 | 409 mm 2 |
| Height | 450 mm 1 | 561 mm 2 |
| Depth | 226 mm 1 | 237 mm 2 |
| Weight | 34 kg 1 | 24.3 kg ✓ 2 |
| Warranty & lifespan | ||
| Warranty | 10 years 1 | 10 years 2 |
Sources
- H3 Smart THREE-PHASE HYBRID INVERTER, V1.2 | 2025/07/02 — Fox ESS · accessed 29 Sept 2026
- PLENTICORE Hybrid inverter - G3 4.0-20 kW, 09 / 2025 — KOSTAL Industrie Elektrik GmbH · accessed 29 Sept 2026