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How Many Solar Panels Do I Need for My Home in Hyderabad? 2026 Calculator

Q: What if I can't fit enough solar panels on my roof?

If your roof space is limited, you have three options: (1) Use higher-wattage panels — 540W or 580W panels generate more per panel than 375W panels, so fewer panels are needed for the same system size. (2) Use TopCon technology panels, which have higher efficiency (22%+) and fit more watts per square metre. (3) Install a partial system that covers 50–70% of your consumption and reduce the remainder via behaviour changes. Net metering still works — you offset what you can and pay DISCOM for the rest.

Q: Can I get 500W panels for my home in Hyderabad?

Yes. 500W–580W panels are now standard in the residential market in Hyderabad. Common sizes installed are 530W, 540W, 545W, and 560W. Larger wattage panels mean fewer panels for the same system size, which reduces mounting hardware and installation cost. Sri Ishaan Solar installs 540W and 545W panels as default for most residential systems.

Q: What if my roof faces east or west instead of south?

In Hyderabad, south-facing roofs give the maximum annual generation. East-facing roofs generate about 80–85% of south-facing output; west-facing roofs generate about 80–85% as well. If your roof faces east or west, you may need 15–20% more panels to achieve the same monthly generation. A roof facing east is actually excellent for morning generation, which coincides with peak household consumption in many Indian homes.

Q: How much roof space does each solar panel need?

A standard 540W panel measures approximately 2.2m × 1.1m = 2.4 sq.m. However, with mounting frames, inter-panel spacing, edge clearance, and access walkways, you should plan for approximately 8–10 sq.m of usable shadow-free roof per kW of solar installed. A 3 kW system needs roughly 25–30 sq.m of clear south-facing roof area.

Q: How many solar panels does a 3BHK home in Hyderabad need?

A 3BHK home in Hyderabad typically consumes 300–500 units/month depending on whether it has 1–2 ACs, how long they run, and other appliances. A 3 kW system (6 panels of 540W) covers about 360 units/month — adequate for a 3BHK with one 1.5-ton AC used moderately. With 2 ACs running heavily, size up to 4–5 kW (8–10 panels) for full offset. Sri Ishaan Solar can size your system precisely from your last 12 months of bills.

Updated May 2026 | By Sri Ishaan Solar Team

The most common question we get: "How many solar panels do I need?" The answer depends on your electricity consumption, the wattage of the panels you choose, and your available roof space. This guide gives you a simple 3-step formula plus a ready-made table for Hyderabad homes.

The 3-Step Formula for Hyderabad Homes

Step 1 — Find Your Monthly Electricity Consumption

Look at your TSSPDCL electricity bill. The number you need is your monthly consumption in units (kWh). Use an average of your last 3–6 bills for a more accurate figure. Bills peak in April–June (AC season) and dip in November–January.

If you don't have bills handy, use these rough estimates: a 2BHK without AC uses 80–150 units/month; with one 1.5-ton AC running 6–8 hours/day, add 200–250 units/month.

Step 2 — Divide by 120 to Get System Size in kW

In Hyderabad, a 1 kW solar system generates approximately 120 units per month on an annual average (accounting for seasonal variation, monsoon, and panel degradation). This is based on Hyderabad's solar irradiance of ~5.5 peak sun hours/day.

Formula: System size (kW) = Monthly consumption (units) ÷ 120

Step 3 — Divide kW by Panel Wattage to Get Panel Count

Divide your system size in watts by the wattage of the panel you are installing.

Formula: Number of panels = System size (W) ÷ Panel wattage (W)

For example, a 3 kW system using 540W panels: 3,000 ÷ 540 = 5.55 → 6 panels

Quick Reference Table: Bill to Panel Count

Monthly Bill (est.)	Consumption (units)	System Size	Panels (540W)	Roof Area Needed
₹800–1,200	100–150 units	1–1.5 kW	2–3 panels	10–15 sq.m
₹1,500–2,500	200–300 units	2 kW	4 panels	18–20 sq.m
₹2,500–4,000	300–450 units	3 kW	6 panels	25–30 sq.m
₹4,000–6,500	450–650 units	4–5 kW	8–10 panels	35–45 sq.m
₹6,500–10,000	700–1,000 units	6–8 kW	11–15 panels	55–70 sq.m
₹10,000+	1,000+ units	10 kW+	19–20 panels	85–100 sq.m

Roof area is for usable shadow-free space including mounting clearances. Bill estimates assume TSSPDCL LT-1 domestic slab rates. Consumption-to-bill ratios vary by slab; check your actual bill for the units figure.

Panel Count by Home Type — Worked Examples

2BHK Apartment (No AC or 1 AC)

Typical consumption: 180–300 units/month. Recommended system: 2–3 kW = 4–6 panels (540W). Roof space needed: 20–28 sq.m. If the apartment has a dedicated terrace, this is easily achievable. In a flat with only balcony space, you may need to explore a smaller 1–2 kW system.

3BHK Home (1–2 ACs)

Typical consumption: 350–550 units/month. Recommended system: 3–5 kW = 6–10 panels (540W). Roof space needed: 28–45 sq.m. With one 1.5-ton AC used 6–8 hours/day, a 3 kW system covers the full bill most months. Add a second AC and go to 4–5 kW.

4BHK Independent House (2–3 ACs)

Typical consumption: 600–900 units/month. Recommended system: 5–8 kW = 10–15 panels (540W). Roof space needed: 45–70 sq.m. Most independent houses in Hyderabad have a terrace of 600–1,200 sq.ft — ample for a 5–8 kW system that fully offsets the bill.

Large Independent House or Villa (3+ ACs, Pool, EV)

Typical consumption: 1,000–1,500 units/month. Recommended system: 10 kW = 19–20 panels (540W). Roof space needed: 85–100 sq.m. With net metering, surplus power in mild months offsets heavier summer bills. Note: For systems above 10 kW, you move out of the PM Surya Ghar residential subsidy bracket and into commercial/industrial territory.

Common Home Appliances and Monthly Consumption

Appliance	Wattage	Hours/Day	Units/Month
1.5 Ton 5-Star AC	1,200–1,500W	8 hrs	~290–360 units
Refrigerator (250L)	150W	24 hrs	~50–55 units
Washing Machine	500W	1 hr/day	~15 units
LED TV 55 inch	100W	5 hrs	~15 units
Water Heater / Geyser	2,000W	0.5 hr/day	~30 units
Ceiling Fans (4 nos.)	70W each	12 hrs	~100 units
Lighting (LED, 10 pts)	10W each	6 hrs	~18 units

Key insight: The air conditioner is by far the biggest load in any Hyderabad home. Size your solar system primarily around your AC usage — everything else is secondary.

How Roof Space Limits Your System

A 540W panel is approximately 2.2m × 1.1m. But with mounting frames, inter-row spacing (needed to avoid self-shading), and a safety margin from the parapet wall, you need roughly 8–10 sq.m of clear south-facing roof per kW of installed capacity.

Practical rule of thumb for Hyderabad rooftops:

500 sq.ft usable roof → ~4 kW system → ~8 panels of 540W
800 sq.ft usable roof → ~6 kW system → ~12 panels of 540W
1,200 sq.ft usable roof → ~10 kW system → ~19–20 panels of 540W

Shading from water tanks, staircases, parapet walls, and nearby buildings significantly reduces usable area. Sri Ishaan Solar does a free roof assessment to identify the exact unshaded area and optimal panel placement before quoting.

Get Your Exact Panel Count — Free Roof Assessment

Send us your last electricity bill and a photo of your roof on WhatsApp. Sri Ishaan Solar will tell you exactly how many panels you need, what system size to install, and what your monthly savings will be — at no charge.

WhatsApp Your Bill for Free Sizing

Frequently Asked Questions

What if I can't fit enough solar panels on my roof?

Three options: (1) Use higher-wattage panels — 580W TopCon panels pack more power per panel than 375W PERC panels, so fewer are needed. (2) Install a partial system that offsets 50–70% of your consumption — net metering still works and you significantly reduce your bill. (3) For apartments, check if the building society allows pooled rooftop use. Sri Ishaan Solar can design a system around whatever space is available.

Can I get 500W panels for my home in Hyderabad?

Yes — 500W to 580W panels are now the standard for residential installations in Hyderabad. Sri Ishaan Solar installs 540W panels as the default for most residential systems. Higher wattage means fewer panels for the same system output and can reduce mounting and installation costs.

What if my roof faces east or west instead of south?

East and west-facing roofs generate approximately 80–85% of what a south-facing roof produces annually. Size your system 15–20% larger to compensate. East-facing roofs generate peak power in the morning (7 AM–12 PM), which is great if your family's peak consumption is in the morning. West-facing roofs peak in the afternoon (12 PM–5 PM), aligning well with AC load in summer. Both orientations are viable with proper system sizing.

How much roof space does each solar panel need?

A 540W panel is approximately 2.2m × 1.1m (2.4 sq.m of panel area). With mounting clearances, inter-row spacing, and edge setback, plan for 8–10 sq.m of shadow-free usable roof per installed kW. A 3 kW system needs roughly 25–30 sq.m of clear south-facing roof.

How many solar panels does a 3BHK home in Hyderabad need?

A 3BHK in Hyderabad typically uses 300–500 units/month. A 3 kW system (6 panels of 540W) covers roughly 360 units/month — adequate for a 3BHK with one AC used moderately. With two ACs running heavily in summer, size up to 4–5 kW (8–10 panels) to fully offset the annual average bill. Sri Ishaan Solar sizes your system from your actual 12-month bill history for a precise recommendation.