Emerald Solar · Kerala & South India

7 kW Solar Power Plant for Large Homes

7 kW rooftop solar power plant in Kerala for ₹3,62,000 after subsidy. 819 units a month, 5.3-year payback. Run two ACs, induction cooking and an electric car on solar.

Calculate Savings
₹3,62,000 price after subsidy
819units a month
₹5,733electricity value a month at ₹7/unit
5.3 yrspayback · 19.0% annual return

Overview

7 kW Solar Power Plant: What You Get

A 7 kW solar power plant suits large homes, villas and joint families with high consumption. Thirteen to fourteen Tier-1 panels on about 700 sq ft of roof generate roughly 819 units a month, worth ₹5,733 at ₹7 a unit or ₹68,796 a year.

After the ₹78,000 PM Surya Ghar subsidy the plant costs about ₹3,62,000, pays back in about 5.3 years and returns around 19% a year. With AC, induction cooking and the rest of the home on solar it still leaves over 340 units a month, enough for an electric car driving 2,000 km.

Best for

  • Homes using 700–900 units a month
  • Bills of ₹5,000–₹6,500 a month
  • Two ACs, an EV and induction cooking
  • Joint families and villas
Emerald technicians installing a 7 kW rooftop solar power plant in Kerala

Price, Subsidy & Savings

7 kW Solar Plant Cost and Payback Calculation

Every figure below is calculated for a 7 kW residential on-grid plant at Kerala’s average 3.9 units per kW per day and ₹7 a unit.

System capacity7 kW on-grid (hybrid option available)
Solar panels13–14 × 540–555 Wp Tier-1 mono PERC (TOPCon optional)
Roof area needed~700 sq ft shadow-free
Generation27.3 units/day · 819 units/month · 9,828 units/year
Electricity value₹5,733 a month · ₹68,796 a year
Price before subsidy₹4,40,000
PM Surya Ghar subsidy₹78,000 (credited to your bank account after commissioning)
Price after subsidy₹3,62,000
Payback period5.3 years
Simple annual return19.0%
5-year electricity value₹3,43,980
25-year electricity value*₹15,82,892
CO₂ avoided~8.4 tonnes a year

* 25-year value assumes a flat ₹7/unit tariff (no increases) and 0.7% yearly panel degradation, so it is conservative. Prices are indicative catalogue figures, confirmed after a free site survey. Subsidy as per prevailing PM Surya Ghar: Muft Bijli Yojana norms. Not a guaranteed return.

Compare Home Solar Plant Sizes

SystemPanelsRoof areaUnits / monthValue / monthSubsidyAfter subsidyPayback
1 kW 2 ~100 sq ft 117 ₹819 ₹30,000 On survey —
2 kW 4 ~200 sq ft 234 ₹1,638 ₹60,000 On survey —
3 kW 6 ~300 sq ft 351 ₹2,457 ₹78,000 ₹1,22,000 4.1 yrs
5 kW 9–10 ~500 sq ft 585 ₹4,095 ₹78,000 ₹2,37,000 4.8 yrs
7 kW 13–14 ~700 sq ft 819 ₹5,733 ₹78,000 ₹3,62,000 5.3 yrs
10 kW 18–20 ~1,000 sq ft 1,170 ₹8,190 ₹78,000 On survey —

Monthly Energy Balance

How Far Do 819 Units Go?

Add an all-electric lifestyle one load at a time and see how much of a 7 kW plant’s monthly output is still left.

+ Lights, fans, fridge, TV, pump (250) 569 spare
+ 1.5 ton AC, 8 hours a day (134) 435 spare
+ All cooking on induction (93) 341 spare
+ Electric scooter, 1,000 km (26) 315 spare
+ Electric car, 1,500 km (250) 65 spare

Monthly energy balance only, in units. Daytime solar used directly or exported is credited through net metering; evening and night use draws from the grid or a battery.

Solar + Your Lifestyle

What a 7 kW Solar Plant Can Power

A 7 kW plant generates about 819 units a month. Here is what that energy means for an electric car, an electric scooter, an air conditioner and your kitchen, worked out at ₹7 a unit.

Electric car charging at a Kerala home with rooftop solar

Solar + Electric Car · Example: Tata Punch EV

Drive your EV on your own rooftop solar

Sunshine is the fuel. At 6 km per unit, 7 kW of solar is enough for about 4,914 km of driving a month if all of it went to the car. A typical owner driving 1,500 km a month uses about 250 units, 31% of this plant’s output.

4,914 kmEV driving a month from 7 kW*
₹231full charge of a 30 kWh battery at grid tariff
₹1.17/kmat grid tariff vs ₹7.13/km on petrol
₹1,07,400fuel saved a year driving 1,500 km/month
Solar system3 kW5 kW7 kW
Monthly generation351 units585 units819 units
EV driving per month*2,106 km3,510 km4,914 km
Full charges / month (30 · 40 kWh)10.6 · 8.017.7 · 13.324.8 · 18.6
Investment after subsidy₹1,22,000₹2,37,000₹3,62,000
Annual electricity value₹29,484₹49,140₹68,796
Payback period4.1 years4.8 years5.3 years
Annual return24.2%20.7%19.0%

5 kW is the ideal start for a home with one EV: solar power for the house and the car. With a hybrid system you can also charge at night from the battery.

* Theoretical figure if all solar power goes to the EV. Assumes 3.9 units/kW/day (Kerala average), ₹7/unit, 6 km per metered unit, 10% charging loss, petrol ₹107/litre at 15 km/l. An on-grid system cannot charge the car directly at night; net-metering rules apply. Confirm variant, range and price with the vehicle maker. Not a guaranteed return.

Electric scooter that can be charged from rooftop solar

Solar + Electric Scooter · Example: Ather 450 series

Your daily ride, charged by the sun

Riding 1,000 km a month costs just ₹163–₹183 even at grid tariff. A 7 kW plant could fully charge a 2.9 kWh scooter about 257 times a month, so one scooter uses only 3% of its output.

₹22–₹27per full charge at ₹7/unit
₹0.16approx. cost per km
257full charges a month from 7 kW*
₹26,337saved a year vs a petrol scooter (1,000 km/month)
Model / batteryIDC rangeFull charge1,000 km / monthCharges / month from 7 kW*
Ather 450S · 2.9 kWh 122 km ₹22 ₹183 257
Ather 450S · 3.5 kWh 161 km ₹27 ₹167 213
Ather 450X · 2.9 kWh 126 km ₹22 ₹177 257
Ather 450X · 3.5 kWh 161 km ₹27 ₹167 213
Ather 450 Apex · 3.5 kWh 165 km ₹27 ₹163 213

3 kW of solar is more than enough for one scooter; the rest powers your home and cuts your bill.

* Theoretical figure if all solar power goes to the scooter; excludes household use. Based on the maker’s published IDC range, 10% charging loss, ₹7/unit, petrol scooter at 45 km/l. Real-world range will be lower than IDC. Confirm variant, price and availability with the dealer.

Inverter air conditioner running on rooftop solar power

Solar + Air Conditioner · 1.5 & 2 ton inverter AC

Beat the summer heat without the bill shock

The sun heats, solar cools. Running a 1.5 ton 3-star AC for 8 hours a day costs about ₹941 a month, and needs only 16% of a 7 kW plant’s output.

₹941/mo1.5 ton 3-star AC, 8 hours a day
16%of 7 kW output for one 1.5 ton AC*
₹3,024saved a year with a 2 ton 5-star vs 3-star
61.5 ton ACs this plant can run*
AC (8 hours/day)Units / monthCost / monthCost / yearShare of 7 kW
1.5 ton · 3-star 134 ₹941 ₹11,290 16%
1.5 ton · 5-star 106 ₹739 ₹8,870 13%
2 ton · 3-star 192 ₹1,344 ₹16,128 23%
2 ton · 5-star 156 ₹1,092 ₹13,104 19%

Solar powers the AC directly while it runs in the daytime. A BEE 5-star inverter AC plus solar doubles the savings; set it to 24–26°C to save even more.

* 8 hours/day, 30 days/month; illustrative average input: 1.5 ton 3-star 0.56 kW, 5-star 0.44 kW; 2 ton 3-star 0.80 kW, 5-star 0.65 kW. Actual use varies with model, room size and temperature setting; check the annual kWh on the BEE label.

Cooking on an induction hob powered by rooftop solar instead of LPG

Solar + Induction Cooking · 14.2 kg LPG at ₹949

Cook with the sun, save on gas cylinders

One 14.2 kg cylinder equals roughly 138 units of induction cooking. Moving all your cooking to induction needs about 93 units a month, only 11% of a 7 kW plant, and avoids about ₹7,697 of LPG a year.

8 → 4cylinders a year when half the cooking moves to induction
₹7,697of LPG a year avoided with full induction
11%of 7 kW output covers all cooking
93 unitsa month for all cooking on induction
Cooking moved to inductionLPG cylinders / yearLPG cost / yearInduction units / month
0% (LPG only) 8.1 ₹7,697 0
25% 6.1 ₹5,773 23
50% 4.1 ₹3,849 47
75% 2.0 ₹1,924 70
100% (all induction) 0.0 ₹0 93

No flame, no gas-leak worry and a cooler kitchen. Keep LPG as backup and every cylinder lasts longer.

One 14.2 kg cylinder every 45 days (₹949, Kottayam, 31.10.2026); 1 cylinder ≈ 138 induction units. On grid power induction costs about the same as LPG; savings come from cooking on daytime solar. Evening cooking on solar needs a hybrid system.

Solar Savings Calculator

Which Solar Plant Size Do You Need?

Tick what you run at home, pick a plant size, and see generation, savings, payback and whether the plant covers your loads. Figures use Kerala averages (3.9 units/kW/day, ₹7/unit).

1. What do you want to run on solar?
0 units
3. Choose a plant size

Your 7 kW solar plant

0 units/month

worth ₹0 a month at ₹7/unit

  • Your selected load0 units
  • PM Surya Ghar subsidy₹0
  • Price after subsidyOn survey
  • Payback periodOn survey
  • Annual savings₹0
  • Roof area needed0 sq ft

Indicative estimates only. Prices are Emerald’s catalogue figures after subsidy for residential on-grid plants; 1, 2 and 10 kW plants are priced after a free site survey. Actual generation varies with location, shading and season; bill savings depend on KSEB tariff slabs and net-metering rules.

Tier-1 monocrystalline half-cut solar panel used by Emerald

Solar PV Modules

Tier-1 Panels Built for Kerala’s Heat and Humidity

Cell technologyMonocrystalline, 144 half-cut cells
Module optionsMono PERC 540–555 Wp · TOPCon bifacial 575–590 Wp
Module efficiency21% – 22.8%
Dimensions2278 × 1134 × 30–35 mm (approx.)
Frame & glassAnodised aluminium, 3.2 mm tempered AR glass
Junction boxIP68, 3 bypass diodes, MC4-compatible
CertificationsBIS / IEC 61215, IEC 61730, ALMM listed
Warranty12-year product · 25–30-year linear performance

Brand and wattage are confirmed at the time of quotation based on availability and site design. See also our solar panel product page.

Emerald solar engineer doing a free rooftop site survey with a Kerala homeowner

How We Work

From Survey to Sunshine in 5 Steps

Complete, ready-to-install systems. We handle the engineering, the KSEB paperwork and the subsidy, so going solar is simple.

  • Tier-1 ALMM-listed solar modules
  • Grid-tie / hybrid inverter with app monitoring
  • Hot-dip galvanised mounting structure
  • Earthing & lightning arrester
  • ACDB / DCDB with surge protection
  • UV-resistant DC & AC cabling
  • KSEB feasibility & net-meter paperwork
  • PM Surya Ghar subsidy application support
  • Installation, commissioning & handover
  1. 1Free site surveyRoof, shading and load assessment by our engineers.
  2. 2Design & quoteRight-sized system, transparent pricing and a savings estimate.
  3. 3ApprovalsKSEB feasibility, net-metering and subsidy paperwork.
  4. 4InstallationNeat, safe installation by trained technicians.
  5. 5CommissioningNet meter live, handover and app-based monitoring.
Technician cleaning rooftop solar panels under the Emerald Care maintenance plan

Emerald Care

After-Sales Support That Keeps Output at Its Peak

  • Performance monitoring: remote tracking of generation through the inverter app.
  • Preventive maintenance: scheduled health checks of modules, wiring and earthing.
  • Panel cleaning: professional cleaning on request or under AMC.
  • Warranty support: we handle manufacturer claims on your behalf.

Solar Power Plant FAQs

7 kW Solar Plant FAQs

All FAQs
01.

What is the price of a 7 kW solar system in Kerala?

About ₹4,40,000 before subsidy and about ₹3,62,000 after the ₹78,000 PM Surya Ghar subsidy for a residential on-grid plant, confirmed after a free site survey.
No. The PM Surya Ghar subsidy for a single home is capped at ₹78,000, which is reached at 3 kW. Larger systems still get ₹78,000, so the cost per kW after subsidy rises, which is why the payback of a 7 kW plant (about 5.3 years) is slightly longer than a 3 kW plant.
Indicative Emerald prices for residential on-grid plants after the ₹78,000 PM Surya Ghar subsidy are about ₹1,22,000 for 3 kW, ₹2,37,000 for 5 kW and ₹3,62,000 for 7 kW. Prices include panels, inverter, galvanised structure, earthing, lightning arrester, ACDB/DCDB, cabling, net-meter liaison and commissioning. Hybrid and off-grid systems cost more because of the battery. The final price is confirmed after a free site survey.
Check the units on your last few KSEB bills and divide the monthly average by about 117 (what 1 kW generates in a month in Kerala). A home using 350 units a month needs about 3 kW; 585 units needs 5 kW. Add about 2 kW if you plan to buy an electric car. Use the calculator on this page or book a free site survey for an exact size.
On-grid is the cheapest, pays back fastest and gets the subsidy, but it switches off during power cuts. Off-grid runs entirely on batteries and suits sites without a reliable grid. Hybrid combines net metering with a battery, so it saves money and keeps your home running through outages. Most Kerala homes with a stable supply choose on-grid; homes with frequent outages or an EV choose hybrid.
Around 27 units a day, 819 units a month and roughly 9,800 units a year in Kerala.
Two 1.5 ton 3-star ACs used 8 hours a day need about 269 units a month, about a third of a 7 kW plant's output, leaving plenty for the rest of the home and an EV.
For residential grid-connected rooftop solar, the PM Surya Ghar: Muft Bijli Yojana gives ₹30,000 per kW for the first 2 kW and ₹18,000 for the third kW, capped at ₹78,000. So 1 kW gets ₹30,000, 2 kW gets ₹60,000 and 3 kW or more gets ₹78,000. The subsidy is credited to your bank account after commissioning and inspection, as per prevailing government norms.
About 3.9–4 units a day on average, or roughly 117–120 units a month and 1,400 units a year. Generation is highest from January to May and lower during the monsoon; the annual average already accounts for cloudy and rainy days.
At ₹7 a unit, residential plants pay back in about 4.1 years (3 kW), 4.8 years (5 kW) and 5.3 years (7 kW), equal to a simple annual return of 19–24%. Panels carry a 25–30-year performance warranty, so you enjoy 20 or more years of near-free power after payback. Commercial plants typically pay back in 3–5 years with accelerated depreciation.

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Get a free site visit & estimate for your 7 kW solar plant

Call or WhatsApp +91 87147 04086. Our engineers check your roof, shading and load, then give you a transparent quote and savings estimate.

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