Size an Indian rooftop solar kit

On-grid, hybrid, or off-grid — modules, inverter, batteries, BOS, labour, and PM Surya Ghar CFA, with brand shortlists for 2026.

System

Lowest cost. Exports surplus through net metering. Shuts down in a power cut.

Quality tier

Place

City5.4 PSH · ₹9.5/kWh

Tariff overrideleave 0 to use city slab

Energy

Monthly consumption400 kWh

Peak load5.0 kW

Roof

Usable roof area60 m²

Roof type

Orientation

Shading

Supply

PM Surya Ghar subsidy

₹30k / ₹60k / ₹78k CFA for 1 / 2 / 3+ kW residential

System

Lowest cost. Exports surplus through net metering. Shuts down in a power cut.

Quality tier

Place

City5.4 PSH · ₹9.5/kWh

Tariff overrideleave 0 to use city slab

Energy

Monthly consumption400 kWh

Peak load5.0 kW

Roof

Usable roof area60 m²

Roof type

Orientation

Shading

Supply

PM Surya Ghar subsidy

₹30k / ₹60k / ₹78k CFA for 1 / 2 / 3+ kW residential

What you need to know

Walk the roof, read last year’s bills, then decide on-grid vs backup. These twelve parameters size every kit on this desk.

Your DISCOM bill’s kWh is the single most important input. A 3 BHK with one AC typically sits at 350–500 units. Size the array to this — not to sanctioned load — or you will overspend on modules that export at a low tariff.

On-grid rooftop · Indore

3.30 kWp kit

Net cost

₹1.14 L

After ₹78,000 CFA

Payback

2 yr 5 mo

₹47,412 / year

Modules

550 W · 3 kW inverter

CO₂ avoided

4.3 t

vs India grid mix, yearly

Energy path

Array

3.30 kWp

Inverter

3 kW

Home / DISCOM

13.3 kWh/d

Roof layout

6 × 550 W · 30 m²

Cost split

Modules₹66,000
Inverter₹30,000
Structure + BOS₹64,750
Labour₹31,120

Equipment: ₹96,000
BOS: ₹64,750
Labour: ₹31,120
Gross: ₹1,91,870
Subsidy: − ₹78,000
You pay: ₹1,13,870

Yield

Monthly generation vs use

5,203 kWh / yr

Generation Household use

Effective PSH: 5.40 h
System efficiency: 80%
Self-use: 4,867 kWh
Export: 337 kWh
25-yr generation: 119.7 MWh
25-yr savings: ₹18.56 L

Bill of materials

GST-inclusive mid-2026 India

Item	Brand	Qty	Amount
550 W mono module TOPCon DCR, 12-year product / 30-year linear	Waaree / Adani / Tata Power Solar	6 pcs	₹66,000
3 kW string inverter 1-phase · MPPT	Growatt / GoodWe	1 pcs	₹30,000
Elevated HDGI MMS HDGI 80+ micron · 15–25° tilt	Local / Tata BlueScope	3.3 kW	₹21,450
DC solar cable 4 / 6 sq mm UV, XLPO · red + black	Polycab / Havells	3.3 kW	₹3,960
AC cable + conduit Cu, armoured as required	Polycab / KEI	3.3 kW	₹4,950
DCDB with SPD + isolator Type II SPD, DC fuse / MCB	Schneider / ABB / Hensel	1 set	₹4,500
ACDB with SPD + MCB 1P MCB + Type II SPD	Schneider / Legrand	1 set	₹5,500
Earthing + lightning 2 pits min. · Cu bonded · LA	JMV / local	1 set	₹8,640
Civil pedestals + grouting M20 blocks / chemical fastener	Site civil	3.3 kW	₹8,250
Net meter + CT if required DISCOM-approved bidirectional	Secure / L&T / HPL	1 set	₹7,500
Installation, testing, commissioning Module layout, stringing, AC/DC, handover	EPC labour	3.3 kW	₹19,800
Liaisoning + transport Feasibility, net meter, MNRE portal	EPC	1 lot	₹11,320

Brand desk

Modules

shortlist

Waaree / Adani / Tata Power Solar

Vikram Solar · Premier Energies

ALMM-listed DCR modules keep you subsidy-eligible. Match wattage so strings share one MPPT window.

Inverter

shortlist

Growatt / GoodWe

Sofar · Deye · Solis

String inverters with a city service centre. Size DC:AC around 1.1.

BOS / protection

shortlist

Schneider · ABB · Polycab

Legrand · Havells · Hensel

Type II SPD on both DC and AC, two earth pits, UV cable. This is where cheap kits fail first.

On-grid inverters switch off during a DISCOM outage. Add hybrid + battery if you need backup.
Prices are 2026 India GST-inclusive retail mid-points. City freight, terrace waterproofing, and DISCOM charges vary.