Solar cost in Bengaluru depends more on system size than on any other single factor, and the three sizes that cover almost every home in the city are 3 kW, 5 kW, and 10 kW. In 2026, a 3 kW rooftop system from a BESCOM-empanelled installer costs ₹1.75 to ₹1.95 lakh gross and ₹97,000 to ₹1.17 lakh after the ₹78,000 PM Suryaghar subsidy from MNRE (Ministry of New and Renewable Energy). A 5 kW system nets ₹1.92 to ₹2.17 lakh. A 10 kW system nets ₹3.30 to ₹4.15 lakh. This is the size-by-size companion to our full solar installation cost Bengaluru guide: price tables per size, what each size generates at Bengaluru’s 5.2 to 5.5 peak sun hours, what it saves against BESCOM’s KERC tariff slabs, and how Karnataka’s Gruha Jyothi free-units scheme changes the answer for each size.
Direct answer. In Bengaluru in 2026, a 3 kW solar system costs ₹97,000 to ₹1.17 lakh after the ₹78,000 PM Suryaghar subsidy, a 5 kW costs ₹1.92 to ₹2.17 lakh, and a 10 kW costs ₹3.30 to ₹4.15 lakh. Generation runs about 4,580, 7,635, and 15,270 kWh per year respectively. Payback at BESCOM upper-slab tariffs is 2.8 to 3.3 years for 3 kW, 3.3 to 3.7 years for 5 kW, and 3.5 to 4.5 years for 10 kW. Heaven Green Energy is an MNRE-empanelled installer across all BESCOM districts.
One thing before the tables: the ₹78,000 subsidy is capped at 3 kW for individual homes. Going from 3 kW to 5 kW or 10 kW adds zero extra subsidy. That single fact, plus Gruha Jyothi’s 200 free units, drives most of the sizing math below.
Solar Cost in Bengaluru by Size: The 2026 Overview
Here is the summary table for all three sizes, using Heaven Green Energy installation data for the BESCOM belt in 2026, cross-checked against our Bengaluru Suryaghar guide and the MNRE schedule on pmsuryaghar.gov.in.
| Cost item | 3 kW | 5 kW | 10 kW |
|---|---|---|---|
| Gross turnkey price | ₹1.75 to ₹1.95 lakh | ₹2.70 to ₹2.95 lakh | ₹4.08 to ₹4.93 lakh |
| PM Suryaghar subsidy | ₹78,000 | ₹78,000 | ₹78,000 |
| Net cost after subsidy | ₹97,000 to ₹1.17 lakh | ₹1.92 to ₹2.17 lakh | ₹3.30 to ₹4.15 lakh |
| Annual generation (derated) | 4,580 kWh | 7,635 kWh | 15,270 kWh |
| Annual saving (₹7.80 blended) | ₹35,700 | ₹58,500 | ₹97,000 to ₹1,19,000 |
| Roof needed, shadow-free | 200 to 280 sqft | 400 to 500 sqft | 800 to 1,000 sqft |
| Typical payback | 2.8 to 3.3 years | 3.3 to 3.7 years | 3.5 to 4.5 years |
Assumptions: 5.35 peak sun hours annual average per the MNRE Solar Atlas, a 74 percent performance ratio after monsoon derating, blended tariff of ₹7.80 per kWh for upper-slab consumers, and 0.5 percent annual degradation. The 10 kW savings range reflects self-consumption between 70 and 100 percent; the rest exports at the APPC (Average Power Purchase Cost) of about ₹3.07 per kWh under the KERC 2024 order on kerc.karnataka.gov.in.
Every quote in this guide assumes ALMM-listed Tier-1 panels and a BIS (Bureau of Indian Standards) certified inverter, because BESCOM inspectors check both and a failure forfeits the subsidy. BESCOM’s bidirectional meter and processing charges of ₹3,000 to ₹6,000 sit outside the vendor quote, per our Bengaluru cost guide.
3kW Solar System Cost in Bengaluru
The 3 kW system is Bengaluru’s volume seller. It captures the full ₹78,000 subsidy, fits the typical 3 to 5 kW sanctioned load on most residential connections, and covers 60 to 80 percent of a 3-BHK bill once Gruha Jyothi’s free units are accounted for.
| Cost item | Amount (Bengaluru, 2026) |
|---|---|
| Gross turnkey price | ₹1.75 to ₹1.95 lakh |
| PM Suryaghar subsidy | ₹78,000 |
| Net cost after subsidy | ₹97,000 to ₹1.17 lakh |
| Monthly generation | About 380 kWh (4,580 per year) |
| Annual saving (₹7.80 blended) | ₹35,700 |
| Roof area needed | 200 to 280 sqft shadow-free |
| Typical payback | 2.8 to 3.3 years |
That gross price buys a complete on-grid system: 6 to 8 ALMM-listed mono PERC panels of 450 to 545 Wp, a BIS-certified string inverter, galvanised mounting structure, DC and AC cabling, DCDB and ACDB protection boxes, earthing per IS 3043, and the net metering application. For the item-by-item split, see our solar panel cost breakdown.
Best fit: a household consuming 350 to 550 units a month, one or two air conditioners, and a family of 3 to 5 in areas like Whitefield, Sarjapur, Electronic City, or Yelahanka. After Gruha Jyothi zeroes the first 200 units, a 3 kW system wipes out most of what remains. Homeowners on X in the BESCOM belt report landing at ₹1.5 to ₹1.75 lakh net for 3 kW installs, which tracks the upper half of our range and usually includes premium panels or apartment wiring extras.
Loan route: PM Suryaghar’s collateral-free window lets public sector banks finance up to ₹2 lakh at roughly 6.75 percent. The ₹1.07 lakh midpoint financed over 5 years works out to about ₹2,100 per month EMI, close to the ₹2,975 average monthly saving. The full EMI math per size is in our solar loan EMI guide for 3kW, 5kW and 10kW.
💰 Real numbers
A homeowner in Sarjapur with a 420-unit average monthly consumption installed a 3 kW system through us in early 2026 at ₹1.82 lakh gross. The ₹78,000 subsidy hit his bank account 26 days after BESCOM commissioned the net meter. His post-solar bills carry only fixed charges because Gruha Jyothi covers the residual grid draw under 200 units.
5kW Solar System Cost in Bengaluru
The 5 kW system is the standard upgrade for homes that outgrow the 3 kW ceiling. The subsidy stays capped at ₹78,000, so the extra 2 kW is full retail price, but the generation jump to about 635 kWh a month comfortably handles two or three air conditioners, a geyser, and EV charging on weekends.
| Cost item | Amount (Bengaluru, 2026) |
|---|---|
| Gross turnkey price | ₹2.70 to ₹2.95 lakh |
| PM Suryaghar subsidy | ₹78,000 |
| Net cost after subsidy | ₹1.92 to ₹2.17 lakh |
| Monthly generation | About 635 kWh (7,635 per year) |
| Annual saving (₹7.80 blended) | ₹58,500 |
| Roof area needed | 400 to 500 sqft shadow-free |
| Typical payback | 3.3 to 3.7 years |
The per-kW cost drops at this size: 5 kW works out to roughly ₹54,000 to ₹59,000 per kW gross versus ₹58,000 to ₹65,000 for 3 kW, because the inverter, structure, and labour scale sub-linearly. Inverter sizing matters more at 5 kW in Bengaluru than in drier cities: this inverter sizing guide from Qbits Energy explains why oversizing the inverter hurts low-light monsoon yield, and monsoon is exactly when Bengaluru panels need help.
Best fit: monthly consumption above 550 units, a 4-BHK or a 3-BHK with heavy AC use, and bills that consistently sit in the ₹8.10 slab. At that usage, every solar unit saves the top slab rate, which is why 5 kW payback stays close to 3 kW payback despite the lower subsidy density. If you are planning an EV in the next two years, 5 kW also future-proofs you against crossing the Gruha Jyothi threshold, because the EV alone adds 150 to 250 units a month.
One honest caveat: if your consumption is 450 units or below, a 5 kW system will over-generate. Surplus units settle at ₹3.07 per kWh at the annual March settlement instead of saving you ₹8.10, and that stretches payback by a year or more. Size to your daytime load, not to your roof.
Curious what a 5 kW would save on your exact BESCOM bill? Our free solar calculator takes your bill amount and returns size, subsidy, savings, and payback in 60 seconds.
10kW Solar System Cost in Bengaluru
The 10 kW system is the residential net metering cap in Karnataka and the choice of villas, large independent houses, and small clinics or offices on domestic connections. It is also where Bengaluru buyers most often overspend, because a 10 kW quote sounds impressive and the subsidy framing gets murky.
| Cost item | Amount (Bengaluru, 2026) |
|---|---|
| Gross turnkey price | ₹4.08 to ₹4.93 lakh |
| PM Suryaghar subsidy | ₹78,000 |
| Net cost after subsidy | ₹3.30 to ₹4.15 lakh |
| Monthly generation | About 1,270 kWh (15,270 per year) |
| Annual saving | ₹97,000 to ₹1,19,000 (self-consumption dependent) |
| Roof area needed | 800 to 1,000 sqft shadow-free |
| Typical payback | 3.5 to 4.5 years |
The ₹78,000 subsidy is the same as a 3 kW system gets. It does not scale. Only about 16 to 19 percent of a 10 kW gross cost is subsidised, versus 40 to 45 percent for a 3 kW. The system still pays back because upper-slab BESCOM tariffs are high and per-kW hardware cost falls at this size, but any vendor quoting a “bigger subsidy” at 10 kW is inflating the story.
Best fit: consumption above 900 units a month, three or more air conditioners, an EV charger, possibly a home theatre or pool pump, and a sanctioned load that supports 10 kW. Check the sanctioned load printed on your BESCOM bill first. If it says 5 kW, you need a load enhancement application (15 to 20 days, separate workflow) before BESCOM will approve the system.
A warning from the field: Bengaluru homeowners on X report that large systems expose billing gaps. One 9.72 kW owner documented 1,400 to 1,500 units of monthly generation but only 500 to 600 units credited by BESCOM for months because the net meter was wired incorrectly. The lesson at 10 kW is to verify your first three to four post-commissioning bills line by line and raise an e-portal ticket immediately if export credits are missing. The subsidy DBT itself is separate and reliable; it is the billing operations that need watching.
⚠️ Watch out
Homeowners on X regularly report being told the subsidy scales with system size, so they upsize expecting proportionally more money back. It does not. The cap is ₹78,000 for any individual residential system of 3 kW or above, per MNRE 2026. Only housing society common-area systems use a different slab of ₹18,000 per kW.
Which Size Should You Pick? The Bengaluru Size-Gate Method
Our proprietary framework for this decision is the Bengaluru Size-Gate Method, built from installations across the BESCOM belt. Definition: the right system size is the smallest size that passes all three gates. If a size fails any gate, drop down or fix the constraint first.
- Gruha Jyothi bill gate. Average your last 12 months of units, subtract the 200 free units, and that is your paid consumption. As a thumb rule, divide paid monthly units by 130 to get bill-implied kW. 400 paid units gives about 3 kW. 620 paid units gives about 5 kW. Below 50 paid units a month, no size passes this gate and we advise waiting.
- Roof gate. Measure your shadow-free terrace in sqft and divide by 100. A 450 sqft clear roof caps you at about 4.5 kW regardless of your bill. Water tanks, lift rooms, and adjacent apartment towers all subtract, and in Bengaluru’s dense layouts shading analysis is not optional.
- Sanctioned-load gate. Your BESCOM sanctioned load caps the system size approved for net metering. Most urban homes carry 3 to 5 kW. Enhancement is possible but adds 15 to 20 days before feasibility approval.
The smallest passing size wins. Here is the decision table we use on site visits:
| Monthly consumption (units) | Paid units after Gruha Jyothi | Recommended size | Net cost after subsidy |
|---|---|---|---|
| Under 250 | Under 50 | Wait, solar not economic yet | Not applicable |
| 350 to 550 | 150 to 350 | 3 kW (full subsidy) | ₹97,000 to ₹1.17 lakh |
| 550 to 900 | 350 to 700 | 5 kW | ₹1.92 to ₹2.17 lakh |
| Above 900 | Above 700 | 10 kW | ₹3.30 to ₹4.15 lakh |
For the national version of this comparison with city-by-city generation, read 3kW vs 5kW vs 10kW home solar. For edge cases like daytime-empty houses and low-consumption households, the home solar system size guide goes deeper.
- ✓ Fastest payback, 2.8 to 3.3 years at BESCOM tariffs
- ✓ Full subsidy density at 3 kW, 40 to 45 percent of gross cost
- ✓ Keeps grid draw under the 200-unit Gruha Jyothi threshold
- ✓ No sanctioned-load enhancement delay at 3 kW for most homes
- ✗ Surplus exports settle at ₹3.07 per kWh APPC, not ₹8.10
- ✗ Zero extra subsidy above 3 kW, extra capacity is full retail
- ✗ Load enhancement adds 15 to 20 days before approval
- ✗ Payback stretches by 0.5 to 1.5 years on wasted export
BESCOM Tariffs, Savings and Payback by Size
Your savings depend on which BESCOM slab your consumption touches, because solar offsets your most expensive units first under net metering. BESCOM (Bangalore Electricity Supply Company) domestic slabs under the KERC 2024 tariff order: ₹4.10 per kWh for the first 50 units, ₹5.55 for 51 to 100, ₹7.10 for 101 to 200, and ₹8.10 above 200 units. Fixed charges, fuel adjustment, and electricity duty are billed separately and survive solar.
| System size | Units offset per year | Slab where savings land | Annual saving | Payback (net cost) |
|---|---|---|---|---|
| 3 kW | 4,580 kWh | ₹7.10 to ₹8.10 | ₹35,700 | 2.8 to 3.3 years |
| 5 kW | 7,635 kWh | ₹8.10 | ₹58,500 | 3.3 to 3.7 years |
| 10 kW | 15,270 kWh | ₹8.10, partial APPC export | ₹97,000 to ₹1,19,000 | 3.5 to 4.5 years |
Two nuances the table hides. First, the 5 kW and 10 kW rows assume your consumption absorbs the generation; whatever it cannot absorb settles at ₹3.07 per kWh in March. Second, these figures assume roughly 80 percent self-consumption. Daytime-empty homes self-consume less, and the solar payback period explained guide shows the export-credit adjustment in detail.
The monsoon caveat is specific to this city. June to September output drops 25 to 30 percent below the annual average, which is already priced into the 4,580 and 7,635 kWh annual figures above. Quotes that assume 4,800-plus kWh per year from a 3 kW system in Bengaluru are using Gujarat math. For the engineering view on the interconnection itself, the BESCOM net metering guide from Heaven Designs documents the technical workflow, and our own net metering in India guide compares Karnataka’s rules with other states. KREDL tracks Karnataka’s rooftop targets at kredl.kar.nic.in.
How Gruha Jyothi Changes the Math at Each Size
This is the Bengaluru-specific twist no national guide handles well. Karnataka’s Gruha Jyothi scheme gives domestic consumers free electricity up to 200 units a month (Government of Karnataka, 2023 onwards). Solar only monetises units above that line, so the free scheme hits each size differently.
- 3 kW and Gruha Jyothi. The strongest pairing. Solar covers 350 or so paid units, Gruha Jyothi covers the residual grid draw under 200, and many households end up paying only fixed charges. Payback stays at 2.8 to 3.3 years.
- 5 kW and Gruha Jyothi. Works only for homes genuinely above 550 units. Below that, you are generating power that competes with free units, which destroys the economics.
- 10 kW and Gruha Jyothi. Irrelevant for eligibility (you are far past 200 units) but the free scheme still subsidises whatever grid draw remains, softening your bill during monsoon months when solar dips.
The strategic angle most people miss: Gruha Jyothi eligibility depends on staying under the 200-unit threshold. A household at 180 units that adds an EV or a third AC crosses out of the free scheme entirely. Solar hedges that risk by pulling grid draw down permanently. Homeowners on X are split on this: some report zero bills and question why they would spend ₹1 lakh on solar, while others who crossed the threshold after buying EVs report bills jumping past ₹3,000 and wish they had installed earlier. Our Suryaghar Bengaluru guide covers the full crossover analysis; the short version is that above 350 total units a month, solar wins clearly.
📘 Regulation note
Solar and Gruha Jyothi can coexist on the same connection: net metering applies to your imports and exports, and the 200-unit free allowance applies to your net grid draw. Track both on the BESCOM consumer portal at bescom.karnataka.gov.in after commissioning.
Mistakes Bengaluru Buyers Make, by Size
The failures we see on re-surveys cluster by size. This red-flag list is ordered by how much money each mistake wastes.
-
1
Upsizing for subsidy that does not exist, moving from 3 kW to 5 kW or 10 kW expecting proportionally more money back. The cap is ₹78,000. The extra capacity is full retail.
-
2
Ignoring Gruha Jyothi in the sizing math, buying 5 kW for a 400-unit household where 200 units are already free. The system over-generates and exports at ₹3.07 per kWh.
-
3
Installing 10 kW on a 5 kW sanctioned load, which gets the feasibility application rejected and strands the hardware while the load enhancement crawls through BESCOM.
-
4
Accepting a below-market 3 kW quote under ₹1.65 lakh gross, which almost always means non-ALMM panels (subsidy ineligible) or a missing DCDB, surge protection, or workmanship warranty.
-
5
Skipping the export-credit check after commissioning, assuming the first bills are correct. Verify export credits line by line for the first three to four months.
The thread connecting all five: decisions made without your actual 12-month consumption, your actual roof, and your actual sanctioned load. Run the Size-Gate Method first and three of these five mistakes disappear. For quote-level checks, our how to read a solar quote guide shows what each line item should look like.
How Heaven Green Energy Helps
Heaven Green Energy is an MNRE-empanelled installer with 10,000-plus installations across India and dedicated teams covering Bengaluru Urban, Bengaluru Rural, Tumakuru, and Kolar. For size decisions we apply the Bengaluru Size-Gate Method on a free physical site survey: 12-month bill analysis against the Gruha Jyothi threshold, shadow analysis, roof measurement, and a sanctioned-load check against your actual BESCOM bill. Subsidy filing on the national portal, BESCOM net meter coordination, and 25-year performance support are included in every turnkey price quoted in this guide.
- Residential Solar: 1 to 10 kW rooftop systems with PM Suryaghar subsidy handled end to end, the exact service behind every price in this guide.
- Commercial Solar: above 10 kW for offices, clinics, and societies with custom ROI modelling.
- Solar Calculator: your size, subsidy, and payback from your BESCOM bill in 60 seconds.
- Contact Us: free site visit within 48 hours, itemised proposal shortly after.
Ready to lock your size with real numbers? Get a free site assessment and our Bengaluru engineer will run all three gates on your roof and bill, then send a fixed quote within 48 hours.
Frequently Asked Questions
How much does a 3kW solar system cost in Bengaluru after subsidy?
A 3 kW system costs ₹1.75 to ₹1.95 lakh gross from a BESCOM-empanelled installer with ALMM-listed panels and a BIS-certified inverter. After the ₹78,000 PM Suryaghar subsidy, net cost is ₹97,000 to ₹1.17 lakh. It generates about 4,580 kWh per year after monsoon derating and pays back in 2.8 to 3.3 years at upper-slab BESCOM tariffs, per Heaven Green Energy 2026 installation data.
How much does a 5kW solar system cost in Bengaluru after subsidy?
A 5 kW system costs ₹2.70 to ₹2.95 lakh gross and ₹1.92 to ₹2.17 lakh after the ₹78,000 subsidy. It generates about 7,635 kWh per year, saving roughly ₹58,500 annually at the ₹8.10 top slab. Payback runs 3.3 to 3.7 years, provided your monthly consumption exceeds 550 units so the generation is actually self-consumed rather than exported at ₹3.07 per kWh.
Is a 10kW solar system worth it in Bengaluru?
Only if your monthly consumption exceeds 900 units and you have 800 to 1,000 sqft of shadow-free roof. Net cost is ₹3.30 to ₹4.15 lakh after the same ₹78,000 subsidy a 3 kW gets. Generation of about 15,270 kWh per year saves ₹97,000 to ₹1,19,000 annually depending on self-consumption, paying back in 3.5 to 4.5 years. Below that consumption, exports at the ₹3.07 APPC rate erode returns.
Does the PM Suryaghar subsidy increase for 5kW or 10kW systems?
No. The subsidy caps at ₹78,000 for any individual residential system of 3 kW or above, per the MNRE 2026 schedule: ₹30,000 for the first kW, ₹30,000 for the second, and ₹18,000 for the third. A 5 kW and a 10 kW system receive the same ₹78,000 as a 3 kW. Housing society common-area systems use a separate ₹18,000 per kW slab.
Is solar worth it in Bengaluru if I already get Gruha Jyothi free units?
It depends on consumption. Gruha Jyothi covers up to 200 units a month, so solar only monetises units above that line. Under 250 total units a month, payback stretches past 7 years and we advise waiting. Above 350 units, a 3 kW system pays back in 2.8 to 3.3 years. Solar also keeps you eligible for the free scheme by holding your grid draw under 200 units as your load grows.
Which is better for a 3 BHK in Bengaluru, 3kW or 5kW?
For a 3 BHK with one or two ACs and 350 to 550 monthly units, 3 kW is the better buy: full ₹78,000 subsidy, ₹97,000 to ₹1.17 lakh net, and 2.8 to 3.3 year payback. Choose 5 kW only if consumption consistently exceeds 550 units or you plan an EV within two years. Oversizing a lower-consumption home stretches payback because surplus units export at ₹3.07 per kWh instead of saving ₹8.10.
How long does the whole process take in Bengaluru?
From portal registration to subsidy in your bank account, expect 55 to 85 days with clean documents: 8 to 15 working days for BESCOM feasibility approval, 3 to 5 days for installation, 7 to 12 working days for net meter inspection, and up to 30 days for the DBT credit. Load enhancement for 5 kW or 10 kW systems adds 15 to 20 days before the feasibility step. BESCOM meter charges of ₹3,000 to ₹6,000 are separate from the vendor quote.
