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.
For monthly and annual unit generation figures, see our Solar Panel Unit Generation Guide
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.
