A 4kW solar system is ideal for medium-sized homes (2-4 people) or small businesses, generating 14–20 kWh per day (depending on location). It balances affordability, efficiency, and energy independence.
Best for:
Homes using 3,000–5,000 kWh/year
Reducing electricity bills by 50–70%
Eco-conscious users wanting low-carbon energy
4kW Solar System Specifications
| Feature | Details |
|---|---|
| Solar Panels Needed | 8 (585W panels) |
| Roof Space Required | 20–25 m² (215–270 sq ft) |
| Daily Energy Output | 14–20 kWh (sunny climate) |
| Battery Compatibility | 5–10kWh (for backup) |
| Grid-Tied vs. Off-Grid | Works with both |
4kW Solar System Cost
Average Price (Before Incentives): 350000 – 600000
What Affects Cost?
Panel Type (Mono vs. Poly)
Inverter Type (String vs. Microinverter)
Battery Storage (Add 150000–200000)
Installation Complexity
How Much Can You Save?
Annual Savings: 200000–300000 (depending on electricity rates)
Payback Period: 2–3 years
Example: A 4kW system in Lahore saves 3600 Units per Years.
Should You Add a Battery?
Yes, if: You want blackout protection or live in an area with frequent power cuts.
No, if: You have net metering (sell excess power to the grid).
Recommended Battery Size: 2.5–5kWh (e.g., Tesla Powerwall, Dongjin, Narada, Pylontech)
Best Solar Panels for a 4kW System
| Brand | Efficiency | Warranty |
|---|---|---|
| LONGi | 22.3% | 25-year |
| Jinko Solar | 22.4% | 25-year |
| Canadian Solar | 22.3% | 25-year |
| REC Solar | 22.3% | 25-year |
FAQs About 4kW Solar Systems
1. Is 4kW enough to power a house?
Yes, for 2–4 people (average usage). If you have high AC usage, consider 5–6kW.
2. How long does installation take?
1–3 days (depending on roof type).
3. Can I go off-grid with 4kW?
⚠Possible, but challenging – you’ll need a large battery (10kWh+) and energy-saving habits.