SOFAR ESI
The SOFAR ESI is a solar inverter range from SOFAR with 7 models. Rated AC output 3 kW – 6 kW. Listed and verified: CEC Approved Inverter and VDE-AR-N 4105. Sold in Australia and Germany.
Specifications
- Rated AC output
- 3 kW – 6 kW
- Models in this range
- 7
What the SOFAR ESI does
A solar string inverter turns the direct current from a rooftop array into grid-quality alternating current for the home, and feeds what the home does not use into the grid. The SOFAR ESI range spans 3 kW to 6 kW of AC output, suiting arrays of about 3–3.9 kWp at the small end and 6–7.8 kWp at the large end, as installers commonly size the panels up to 30% above the inverter's rating.
In Germany, arrays of the same size produce about 2,700 to 5,400 kWh a year, assuming a conservative 900 kWh per kWp. For the smallest model, that is worth €208 a year fed into the grid at 7.70 ct per kWh, and up to €999 used at home instead of buying power at 37.0 ct.
Estimates. Electricity prices: BDEW Strompreisanalyse, autumn 2026; Bundesnetzagentur, EEG feed-in tariffs from 1 August 2026.
Product details
- Product type
- Solar inverter
- Brand
- SOFAR · China
- Category
- Home Solar & Hybrid Inverters
- Sold in
- Australia, Germany
- Listed in
- Clean Energy Council (Australia) and ZEREZ (FGW, Germany)
Models (7)
| Model | AC output | Listed until |
|---|---|---|
| ESI 3K-S1 | 3 kW | 20 September 2027 |
| ESI 3.68K-S1 | 3.68 kW | 20 September 2027 |
| ESI 4K-S1 | 4 kW | 20 September 2027 |
| ESI 4.6K-S1 | 4.6 kW | 20 September 2027 |
| ESI 5K-S1 | 5 kW | 20 September 2027 |
| ESI 5K-S1-A | 5 kW | 20 September 2027 |
| ESI 6K-S1 | 6 kW | 20 September 2027 |
Certifications
| Certification | Market | Status | Reference | Valid until |
|---|---|---|---|---|
| CEC Approved Inverter | Australia | ✓ Verified 19 October 2026 | 20 September 2027 | |
| VDE-AR-N 4105 | Germany | ✓ Verified 20 October 2026 | CN-PV-220156 |