The output of a 1kW solar power plant is 4 to 5 units per day in India. The output from one 400W solar power plant is about 1.6 to 2.0 units per day.
What Is a “Unit” of Solar Energy?
One unit = One kilowatt-hour (kWh) = the energy used by a 1,000-watt appliance running for one hour.
- 1 unit powers a 100W LED bulb for 10 hours
- 1 unit runs a ceiling fan for 6–7 hours
- 10 units/day = typical medium Indian household consumption
How Many Units Does a Solar Panel Produce Per Day?
The Simple Formula
Daily Output (kWh) = Panel Capacity (kW) × Peak Sun Hours × 0.80
For most Indian locations (4.5–5.5 peak sun hours): 1 kW × 5.0 hrs × 0.80 = 4.0 units/day
Solar Output by System Size – India Reference Table
| System Size | Daily Output | Monthly | Annual | Panels (400W) |
|---|---|---|---|---|
| 1 kW | 4.0–5.0 units | 120–150 | 1,460–1,825 | 2–3 panels |
| 3 kW | 12–15 units | 360–450 | 4,380–5,475 | 7–8 panels |
| 5 kW | 20–25 units | 600–750 | 7,300–9,125 | 12–13 panels |
| 10 kW | 40–50 units | 1,200–1,500 | 14,600–18,250 | 25 panels |
| 50 kW | 200–250 units | 6,000–7,500 | 73,000–91,250 | 125 panels |
| 100 kW | 400–500 units | 12,000–15,000 | 1,46,000–1,82,500 | 250 panels |
City-Wise Solar Output in India
| City | Peak Sun Hrs | Units/kW/Day | Annual Units/kW |
|---|---|---|---|
| Jodhpur, Rajasthan | 6.2 | 5.0 units | 1,825 |
| Ahmedabad, Gujarat | 5.8 | 4.6 units | 1,679 |
| Chennai, Tamil Nadu | 5.5 | 4.4 units | 1,606 |
| Delhi NCR | 5.5 | 4.4 units | 1,606 |
| Hyderabad, Telangana | 5.5 | 4.4 units | 1,606 |
| Bengaluru, Karnataka | 5.0 | 4.0 units | 1,460 |
| Mumbai, Maharashtra | 5.0 | 4.0 units | 1,460 |
| Kolkata, West Bengal | 4.5 | 3.6 units | 1,314 |
| Kochi, Kerala | 4.5 | 3.6 units | 1,314 |
Real Calculation: Suryatop 635W Panel – Daily Units in Chennai
0.635 kW × 5.5 peak sun hours × 0.80 = 2.79 units/panel/day
20-panel commercial rooftop system (12.7 kW) in Chennai:
| Output Period | Suryatop 635W (23.51%) | Standard 400W PERC (21%) | Suryatop Advantage |
|---|---|---|---|
| Per day | 55.8 units | 35.2 units | +20.6 units/day |
| Per month | 1,695 units | 1,070 units | +625 units/month |
| Per year | 20,367 units | 12,848 units | +7,519 units/year |
At ₹8/unit commercial tariff: Suryatop system generates ₹60,152 more electricity value per year from the same 20 panels.
Looking for Solar Panels That Generate More Units Per Day?
Powersphere’s Suryatop (23.51%) and Agnitop (23.60%) N-Type TOPCon bifacial panels generate 10–15% more units than standard PERC from the same installation. Salem, Tamil Nadu. 800 MW/year. 30-year warranty. → Enquire
Frequently Asked Questions
Approximately 4–5 units/day. High irradiation locations (Rajasthan, Tamil Nadu) → 4.4–5.0 units. Lower irradiation (Kerala, West Bengal) → 3.6 units.
Approximately 1.6–2.0 units/day. Formula: 0.40 kW × 5.0 hours × 0.80 = 1.60 units in average Indian conditions.
With 400W PERC: 30–35 panels. With Suryatop 635W TOPCon: only 18–20 panels — saving roof space and installation cost.
Agnitop (23.60% efficiency) and Suryatop (23.51%) from Powersphere. In a 20-panel system in Chennai, Suryatop generates ~7,500 more annual units than an equivalent 400W PERC system.
Yes — 5–25% more units depending on ground surface. On light gravel ground-mount in South India, Suryatop/Agnitop’s 80% bifaciality delivers 15–20% additional unit generation.
1,460–1,825 units/year depending on location. National average: ~1,500–1,600 units/year/kW.
