Fronius Primo GEN24 4.0 vs SolaX X3-IES-4K
AC power: Fronius Primo GEN24 4.0 4 kW, SolaX X3-IES-4K 4 kW. The SolaX X3-IES-4K is better on 4 of 10 comparable points.
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Both models in detail
Who wins where
- Fronius Primo GEN24 4.0
- SolaX X3-IES-4K
Biggest differences
| Fact | Primo GEN24 4.0 | X3-IES-4K |
|---|---|---|
| Weight | 15.4 kg | 35 kg |
| MPPT voltage min. | 210 V | 110 V |
| MPPT voltage max. | 530 V | 950 V |
| Max. PV array power | 6 kWp | 8 kWp |
| Max. input current per MPPT | 22 A | 20 A |
Score per area = position (0–100) relative to all 263 models in this category; higher is better.
| Technical specifications | FroniusPrimo GEN24 4.0 | SolaXX3-IES-4K |
|---|---|---|
| Performance | ||
| AC power | 4 kW1 | 4 kW1 |
| Max. PV array power | 6 kWp2 | 8 kWp✓3 |
| MPP trackers | 22 | 23 |
| Efficiency | ||
| Max. efficiency | 97.6 %2 | – |
| European efficiency | 97.1 %2 | 97.7 %✓3 |
| Noise | ||
| Noise | 42 dB(A)2 | – |
| Electrical | ||
| MPPT voltage min. | 210 V2 | 110 V✓3 |
| MPPT voltage max. | 530 V2 | 950 V✓3 |
| Max. input current per MPPT | 22 A✓2 | 20 A3 |
| Phases | 11 | 31 |
| Connectivity & smart | ||
| Hybrid (battery-ready) | No1 | No1 |
| Backup power | Yes2 | Yes3 |
| Wi-Fi / monitoring | Yes2 | – |
| Dimensions & weight | ||
| IP rating | IP662 | IP663 |
| Width | 474 mm2 | 717 mm3 |
| Height | 530 mm2 | 405 mm3 |
| Depth | 165 mm2 | 209.5 mm3 |
| Weight | 15.4 kg✓2 | 35 kg3 |
Frequently asked questions
Which is better: the Fronius Primo GEN24 4.0 or the SolaX X3-IES-4K?
AC power: Fronius Primo GEN24 4.0 4 kW, SolaX X3-IES-4K 4 kW. The SolaX X3-IES-4K is better on 4 of 10 comparable points.
What is the AC power of the Fronius Primo GEN24 4.0 and the SolaX X3-IES-4K?
Fronius Primo GEN24 4.0: 4 kW. SolaX X3-IES-4K: 4 kW.
Which is better on weight: the Fronius Primo GEN24 4.0 or the SolaX X3-IES-4K?
Fronius Primo GEN24 4.0: 15.4 kg. SolaX X3-IES-4K: 35 kg.
Which is better on MPPT voltage min.: the Fronius Primo GEN24 4.0 or the SolaX X3-IES-4K?
SolaX X3-IES-4K: 110 V. Fronius Primo GEN24 4.0: 210 V.
Related comparisons
How we collect and check this data →
Sources
- ENA Type Test Register (inverters) — Energy Networks Association (ENA) · accessed 27 Sept 2026
- Fronius Primo GEN24 & GEN24 Plus 3.0 - 6.0 kW – datasheet, EN V04 (June 2025) — Fronius International GmbH · accessed 27 Sept 2026
- X3-IES Series All-in-one Residential ESS Datasheet, V1.8 — SolaX Power · accessed 17 Oct 2026