5kW Solar Panel: Units Per Day & Month in Tamil Nadu

Short answer: a 5kW solar system produces about 20 to 25 units a day in Tamil Nadu. That is 600 to 750 units a month and roughly 7,200 to 8,500 units a year. It comfortably runs a home with two ACs, and it qualifies for the full ₹1 lakh subsidy.

5kW Solar Units at a Glance

The math: 5 kW × 5.2 peak sun hours × 0.78 performance ratio ≈ 20.3 units on an average day, rising past 25 in clear summer weather. A clean, shade-free, well-wired system on an elevated structure stays at the top of the range.

Month by Month (Tamil Nadu Seasons)

Summer, when your AC bill is highest, is exactly when 5kW produces the most. Extra units go to the grid through your net meter and are adjusted against your bill.

What a 5kW System Can Run

This is why 5kW is the usual choice for 3BHK and 4BHK homes, two-AC families, joint families and homes planning an EV. If you have only one AC, 3kW is usually enough.

Roof Space and Panels

• Panels: about nine panels of 550-580 watts (older designs used 15-16 panels of 330 watts).
• Shade-free roof area: about 350 to 500 square feet.
• Structure: on Cuddalore's coast we use a raised hot-dip galvanized structure that keeps panels cooler (more units) and lets you use the terrace below. See best solar structure for coastal Tamil Nadu.
• Connection: a 5kW system usually works on single phase, but if your house load is high TNEB may suggest three phase. Read single phase to 3-phase upgrade.

5kW Price After ₹1 Lakh Subsidy (2026)

Market averages as of October 2026; we give your exact written quote after a free site visit. Full cost breakdown: 5kW solar system cost in Tamil Nadu.

Savings

At 650 units a month, a 5kW system can cut a high summer bill of ₹5,000 - ₹7,000 down to a few hundred rupees, depending on your slab. Typical payback after the ₹1 lakh subsidy is around 3 to 4 years, and the panels keep producing for 25 years.

5kW vs 3kW: Which Should You Pick?

Full comparison: 3kW vs 5kW solar in Tamil Nadu. For every size from 1kW up, see the solar units per day table.

How to Check Your 5kW System Is Performing

Most inverters today come with a mobile app or a display showing "Today's generation" and "Total generation". Check it once a week:

• On a clear sunny day a healthy 5kW system should show about 22-27 units by evening.
• On a cloudy monsoon day 12-19 units is normal.
• Monthly total should land roughly in the season range from the table above.

If a clear day gives under 18 units, something is wrong. Compare a few sunny days before you worry, then look at the reasons below.

6 Reasons a 5kW System Gives Fewer Units

1. Dust and salt on panels. On the Cuddalore coast a thin salty film can cut output by 5-15%. A plain-water wash every 2-4 weeks fixes it. See solar maintenance guide.
2. New shade. A coconut tree that grew, a neighbour's new floor or a water tank can shade one panel and pull down the whole string. Read solar shadow analysis.
3. Grid voltage trips. In areas with high grid voltage, on-grid inverters switch off for safety during peak sun, losing your best hours. A hybrid system or a TNEB complaint can solve it.
4. Low panel tilt or wrong direction. Panels should face south with about a 10-15° tilt in Tamil Nadu. Flat-laid panels collect dust and lose output.
5. Undersized or overheating inverter. A 5kW array needs an inverter sized and ventilated correctly; a hot inverter cuts power ("derating").
6. Loose or poor DC connections. Cheap connectors corrode in coastal air and add losses (and fire risk). Read DC cable quality.

On-Grid or Hybrid for a 5kW Home?

For most Cuddalore homes on-grid gives the best return. Choose hybrid only if power cuts really disrupt your life. Compare in detail: on-grid vs hybrid solar in Tamil Nadu.

Get Your 5kW Design and Subsidy Check

We check your roof, shading and last 6 TNEB bills, then tell you whether 5kW (or 3kW) is right and exactly how much subsidy you qualify for. See the 5kW solar system page or WhatsApp +91 7904369094.