Choosing the right solar system size is crucial for maximizing savings on your DEWA bills while ensuring a strong return on investment. Installing a system that is too small won’t cover your needs, while one that is too large may increase your upfront cost unnecessarily.
In this comprehensive guide, we break down the **best solar system size** for a 3BHK apartment, villa, and small office in Dubai and the UAE in 2026.
Before selecting a system, check your DEWA bill for average monthly consumption in kWh. This is the foundation for correct sizing.
Most 3BHK apartments in Dubai consume between 2,500 and 4,500 kWh per month.
Recommended Size: 5 kW to 8 kW
Villas use more power due to larger space, multiple AC units, and additional loads like garden lights or pools.
Recommended Size: 8 kW to 15 kW
Offices benefit greatly from solar because most consumption happens during daytime.
Recommended Size: 8 kW to 15 kW
| Property Type | Monthly Consumption | Recommended Size | Daily Generation | Expected Bill Savings | Approx. Cost (AED) |
|---|---|---|---|---|---|
| 3BHK Apartment | 2,500 – 4,500 kWh | 5 – 8 kW | 27 – 52 kWh | 50 – 85% | 25,000 – 45,000 |
| Medium Villa (3-4BR) | 5,000 – 8,000 kWh | 8 – 12 kW | 44 – 78 kWh | 60 – 80% | 40,000 – 65,000 |
| Large Villa (4-5BR) | 8,000 – 12,000 kWh | 12 – 15 kW | 66 – 97 kWh | 70 – 90%+ | 60,000 – 85,000 |
| Small Office | 3,000 – 8,000 kWh | 8 – 15 kW | 44 – 97 kWh | 65 – 90% | 40,000 – 80,000 |
*Costs are approximate for 2026 grid-tied/hybrid-ready systems. Adding battery storage increases the cost.
After payback, you enjoy nearly free electricity for the remaining 15–20 years of the system’s life.
Grid-Tied: Best for fastest payback and maximum savings. Ideal for apartments and offices.
Hybrid (with Battery): Recommended for villas if you want backup power during outages. It extends payback slightly but offers energy security.
At Watts & Ergon, a DEWA-approved solar and electrical contractor, we provide complete EV charger installation services for villas, apartments, offices, hotels, and commercial properties across Dubai.
At Watts & Ergon, a DEWA-approved and ISO-certified solar EPC contractor, we specialize in designing and installing high-performance rooftop solar systems tailored specifically for warehouses, distribution centers, and industrial facilities across Dubai and the UAE.
At Watts & Ergon, a DEWA-enrolled, ISO-certified solar EPC contractor, we design and install systems specifically engineered for UAE conditions. Here’s what actually works in 2026.