What Is a 3-Phase Solar System and Why Does Your Factory Need One?
Industrial and commercial premises in Pakistan receive a 3-phase electricity supply from WAPDA — three separate power lines running at 415V between phases, enabling large motors, compressors, chillers, and high-power machinery to run efficiently. A single-phase solar system (like a typical residential 6–10kW hybrid) cannot export power to or import from a 3-phase grid correctly.
A 3-phase solar system uses 3-phase inverters that output three synchronized AC phases, matching your existing WAPDA supply. This enables seamless integration with your distribution board, full net metering eligibility, and safe export of surplus power back to the grid.
Single-Phase vs 3-Phase Solar — Key Differences
| Feature | Single-Phase Solar | 3-Phase Solar |
|---|---|---|
| Suitable For | Homes, small shops | Factories, commercial buildings |
| Inverter Voltage Output | 230V single phase | 415V 3-phase |
| Typical System Size | 5–20kW | 30kW–multi-MW |
| Net Metering Eligible | Yes | Yes |
| Supports Large Motors | No | Yes |
| Phase Balancing | N/A | Automatic |
3-Phase Solar System Sizes We Install
30–100kW Systems
Ideal for small factories, commercial plazas, schools, hospitals. Typically 1–2 Solis 50kW inverters with 80–250 panels. Net metering eligible and fully grid-tied.
100–500kW Systems
Mid-size industrial installations. Multiple string inverters connected to a common AC busbar. Suitable for spinning units, weaving floors, and cold storage.
500kW–2MW Systems
Large industrial EPC projects for composite textile mills, food processing plants, and manufacturing facilities. Requires switchgear room and dedicated DISCO approval.
Hybrid 3-Phase Systems
For facilities needing backup during load shedding. Uses FoxESS or Solis 3-phase hybrid inverters with battery banks — ideal for hospitals, data centres, and critical manufacturing.
Net Metering for 3-Phase Industrial Connections in Pakistan
Under NEPRA's Net Metering Regulations (SRO 892(I)/2015 and subsequent amendments), commercial and industrial consumers can apply for net metering up to 1MW system capacity. The process involves:
- DG&A application submission with system single-line diagram
- DISCO (FESCO/LESCO/MEPCO) technical evaluation
- Bidirectional smart meter installation by DISCO
- Commissioning inspection and grid synchronisation approval
- Commencement of net metering credits on your WAPDA bill
Saigal Solar handles this entire process on your behalf. We have completed dozens of 3-phase net metering applications with FESCO in Faisalabad.
Recommended 3-Phase Inverters for Pakistan
Solis S6 3-Phase
Available in 15kW, 25kW, 33kW, 40kW, 50kW, 60kW, 75kW, and 110kW. IP66 rated, SolisCloud monitoring, wide MPPT voltage range. Our top recommendation for industrial installations.
FoxESS T Series
Available in 10–80kW. Excellent efficiency and robust build. Particularly suited for hybrid 3-phase configurations with battery backup.
Huawei SUN2000
20kW–100kW per unit. Smart String technology, built-in arc fault protection, and excellent SolarEdge-style optimization. For high-shade-sensitivity rooftops.
Multi-Unit Configuration
For systems above 100kW, we install multiple inverters in parallel — each independently feeding the 3-phase busbar — providing redundancy and simpler maintenance.