3kW Solar System for Home: Price, Output & Subsidy in India (2026)

The Short Answer

A 3kW solar system costs ₹1,50,000–₹1,90,000 before subsidy and ₹72,000–₹1,12,000 after PM Surya Ghar subsidy of ₹78,000. It generates 12–15 units per day — India's most popular residential solar size, ideal for 2–3 BHK homes with monthly bills of ₹2,000–₹3,500. This is also the maximum subsidy-optimised size, as the ₹78,000 cap is reached at 3kW.

3kW Solar System Price Breakdown

ComponentCost Range
Solar panels (6 × 540W mono)₹50,000–₹68,000
On-grid inverter (3kW)₹25,000–₹35,000
Mounting structure₹10,000–₹15,000
Wiring, protection, earthing₹8,000–₹10,000
Installation labour₹6,000–₹10,000
Net metering & DISCOM fees₹2,000–₹5,000
GST (13.8%)₹16,000–₹21,000
Total (before subsidy)₹1,50,000–₹1,90,000
PM Surya Ghar subsidy−₹78,000
Net cost (after subsidy)₹72,000–₹1,12,000

The 3kW size maximises subsidy value: ₹30,000/kW for the first 2kW + ₹18,000/kW for the 3rd kW = ₹78,000 total. Beyond 3kW, no additional subsidy applies.

Complete cost comparison across all sizes →

Daily and Monthly Output

PeriodOutputBill Savings (at ₹6–₹10/unit)
Per day12–15 units₹72–₹150
Per month360–450 units₹2,160–₹4,500
Per year4,380–5,475 units₹26,280–₹54,750

For most 2–3 BHK homes consuming 300–450 units/month, a 3kW system offsets 80–100% of the electricity bill. You may end up paying only the fixed DISCOM charges (₹50–₹200/month).

→ Calculate your exact savings

What Can a 3kW System Run?

A 3kW system handles a typical Indian household comfortably:

ApplianceWattageHours/dayDaily Units
LED lights (10)100W60.6
Ceiling fans (4)280W102.8
Refrigerator (260L)180W81.4
TV (LED 50")100W50.5
Washing machine500W10.5
WiFi + laptop + phones100W80.8
Mixer + iron (alternating)800W0.50.4
Inverter AC (1 ton, limited)900W32.7
Total9.7 units

This leaves 2–5 units of daily surplus for net metering. The 3kW system can handle limited AC usage (3–4 hours/day) alongside other appliances. For heavy AC usage, consider 5kW.

Space and Installation

  • Panels: 6 × 540W monocrystalline panels
  • Roof area: ~300 sq ft (shadow-free)
  • Weight: ~90–120 kg total
  • Installation time: 1–2 days
  • Orientation: South-facing, 10–15° tilt

300 sq ft is achievable on most independent house terraces. For apartments, it requires a cooperative society or individually allocated terrace space. Apartment solar guide →

Subsidy and Payback Period

3kW maximises the PM Surya Ghar subsidy at ₹78,000:

  • First 2kW: ₹30,000/kW = ₹60,000
  • 3rd kW: ₹18,000/kW = ₹18,000
  • Total: ₹78,000 (subsidy cap reached)

Payback calculation:

TariffNet CostAnnual SavingsPayback
₹5/unit₹92,000₹22,500~4.1 years
₹7/unit₹92,000₹31,500~2.9 years
₹10/unit₹92,000₹45,000~2.0 years

Most homes with ₹3,000+ monthly bills recover investment in under 3 years.

Why 3kW Is India's Most Popular Size

Three reasons make 3kW the dominant choice:

  1. Subsidy-optimised — ₹78,000 is the maximum subsidy. Going to 4kW or 5kW adds ₹50,000–₹1,30,000 in cost with zero additional subsidy.
  2. Right-sized for most homes — 12–15 units/day covers 80–100% of a typical 2–3 BHK's consumption, including limited AC.
  3. Best cost-to-benefit ratio — After subsidy, you pay ~₹92,000 for a system that saves ₹25,000–₹45,000 per year. No other home investment matches this return.

If your bill consistently exceeds ₹4,000/month (heavy AC, EV charging), the 5kW system is worth the premium despite no extra subsidy.

3kW vs Other Sizes

2kW3kW5kW
Cost after subsidy₹50K–₹80K₹72K–₹1.12L₹1.72L–₹2.42L
Daily output8–10 units12–15 units20–25 units
Runs AC?NoLimited (3–4 hrs)Yes (6–8 hrs)
Bill range₹1K–₹2K₹2K–₹3.5K₹3.5K–₹6K
Subsidy₹60,000₹78,000₹78,000

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The 3kW system is India's best-selling residential solar size. Compare quotes from verified installers who install 3kW systems daily and know the optimal configuration for your roof.

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Common questions

What is the price of a 3kW solar system in India after subsidy?
A 3kW on-grid system costs ₹1,50,000–₹1,90,000 before subsidy. After PM Surya Ghar subsidy of ₹78,000, your net cost is ₹72,000–₹1,12,000. This is the maximum subsidy amount — going above 3kW does not increase the subsidy.
How many units does a 3kW solar system generate per month?
A 3kW system generates 360–450 units per month (12–15 units/day). This is enough to offset ₹2,000–₹4,500 in monthly electricity bills, covering 80–100% of a typical 2–3 BHK home consumption.
Can a 3kW solar system run AC?
Yes, with limitations. A 3kW system can run a 1-ton inverter AC for 3–4 hours daily alongside other household loads. For 6–8 hours of daily AC or multiple AC units, upgrade to a 5kW system.
How many panels are needed for a 3kW system?
With 540W panels, you need 6 panels (6 × 540W = 3,240W). This requires about 300 sq ft of shadow-free roof space. With older 330W panels, you would need 9–10 panels.
Why is 3kW the most popular solar system size in India?
Three reasons: it maximises the PM Surya Ghar subsidy (₹78,000 cap reached at 3kW), it right-sizes for most Indian homes (12–15 units/day), and it offers the best payback ratio (2–4 years). Going above 3kW costs significantly more with no additional subsidy.
What is the payback period for a 3kW solar system?
2–4 years depending on your electricity tariff. At ₹7/unit average, a 3kW system pays back in about 3 years. After payback, you save ₹25,000–₹45,000 annually for the remaining 22+ years of system life.

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