KOSTAL PLENTICORE G3 4.0 vs SMA Sunny Boy Smart Energy 4.0
AC power: KOSTAL PLENTICORE G3 4.0 4 kW, SMA Sunny Boy Smart Energy 4.0 4 kW. The KOSTAL PLENTICORE G3 4.0 is better on 5 of 14 comparable points.
Who wins where
- KOSTAL PLENTICORE G3 4.0
- SMA Sunny Boy Smart Energy 4.0
Biggest differences
| Fact | PLENTICORE G3 4.0 | Sunny Boy Smart Energy 4.0 |
|---|---|---|
| Warranty | 10 years | 5 years |
| MPPT voltage max. | 800 V | 480 V |
| Max. PV array power | 6 kWp | 8 kWp |
| MPPT voltage min. | 80 V | 60 V |
| Weight | 21.8 kg | 17.5 kg |
| Max. input current per MPPT | 17 A | 15 A |
Score per area = position (0–100) relative to all 238 models in this category; higher is better.
| Technical specifications | KOSTALPLENTICORE G3 4.0 | SMASunny Boy Smart Energy 4.0 |
|---|---|---|
| Performance | ||
| AC power | 4 kW 1 | 4 kW 2 |
| Max. PV array power | 6 kWp 1 | 8 kWp ✓ 2 |
| MPP trackers | 3 1 | 3 2 |
| Efficiency | ||
| Max. efficiency | 98.03 % ✓ 1 | 97.8 % 2 |
| European efficiency | 97.2 % ✓ 1 | 96.8 % 2 |
| Noise | ||
| Noise | 39 dB(A) 1 | 35 dB(A) ✓ 2 |
| Electrical | ||
| MPPT voltage min. | 80 V 1 | 60 V ✓ 2 |
| MPPT voltage max. | 800 V ✓ 1 | 480 V 2 |
| Max. input current per MPPT | 17 A ✓ 1 | 15 A 2 |
| Phases | 3 1 | 1 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 2 |
| Width | 409 mm 1 | 500 mm 2 |
| Height | 561 mm 1 | 586 mm 2 |
| Depth | 237 mm 1 | 236 mm 2 |
| Weight | 21.8 kg 1 | 17.5 kg ✓ 2 |
| Warranty & lifespan | ||
| Warranty | 10 years ✓ 1 | 5 years 2 |
Sources
- PLENTICORE Hybrid inverter - G3 4.0-20 kW, 09 / 2025 — KOSTAL Industrie Elektrik GmbH · accessed 29 Sept 2026
- Sunny Boy Smart Energy 3.6 / 4.0 / 5.0 / 6.0 – datasheet, SBSE36-60-DS-en-18 (status 04/2026) — SMA Solar Technology AG · accessed 27 Sept 2026