How many units does a solar system generate per day in Telangana and Andhra Pradesh?

"How many units will it give me?" is the question that matters most when you are deciding on solar. Your bill is counted in units (kilowatt-hours, kWh), so the useful number is not the panel's wattage or efficiency. It is how many units the system puts out each day, month and year on your roof.

Many websites quote national averages or figures from other countries. Here we use figures from our own installations in the Anantapur (APSPDCL) region of Andhra Pradesh, which has a similar climate to much of Telangana and Rayalaseema. We also explain what makes output higher or lower, so you can judge what your own system should produce.

The headline number

From Origian's own installed base in the Anantapur region:

Each kW of rooftop solar produces roughly 1,550 to 1,600 units (kWh) a year.

That works out to about 4.2 to 4.4 units per kW per day on average across the year. In real systems:

• a 3 kW system averages about 400 units a month;
• a 5 kW system averages about 650 units a month.

These are averages across the year. Some months produce more, some less, and your exact figure depends on your roof, as explained below.

Generation by system size

Applying our figure of 1,550 to 1,600 units per kW per year:

1 kW system

• About 1,550 to 1,600 units a year
• About 130 units a month
• About 4.2 to 4.4 units a day

2 kW system

• About 3,100 to 3,200 units a year
• About 260 units a month
• About 8.5 to 8.8 units a day

3 kW system

• About 4,650 to 4,800 units a year
• About 390 to 400 units a month
• About 12.7 to 13.2 units a day

5 kW system

• About 7,750 to 8,000 units a year
• About 650 to 665 units a month
• About 21 to 22 units a day

10 kW system

• About 15,500 to 16,000 units a year
• About 1,300 units a month
• About 42 to 44 units a day

Treat these as planning figures, not guarantees. They come from systems installed with raised structures, good orientation and regular maintenance.

Why output changes through the year

A solar system does not produce the same amount every day. Over a year in Telangana and Andhra Pradesh, you will usually see this pattern.

Strong months

The clear, sunny months, roughly late winter through to before the monsoon, give strong generation, with long sunny days and clear skies. Very hot days in peak summer can trim output a little, because panels lose some performance when they get hot, but the strong sunlight still makes these good months.

Monsoon months

Cloud cover and rain reduce generation. On heavy, overcast days, output can drop well below average. Rain also has an upside: it washes dust off the panels.

Winter

Days are shorter and the sun sits lower in the sky, but skies are often clear and temperatures are cooler, which panels like. Output is usually reasonable.

The annual average of about 4.2 to 4.4 units per kW per day blends all of these.

What makes your system produce more or less

Two 3 kW systems in the same city can produce noticeably different amounts. These are the main reasons.

Shade

Shade is the biggest single cause of underperformance we see. A water tank, parapet wall, neighbouring building or tree that shades panels for part of the day can cut output more than you would expect, because panels wired in a string affect each other. A good installer maps shade at different times of day during the site survey and places panels to avoid it.

Orientation and tilt

Panels facing roughly south, tilted at a suitable angle, catch the most sun over a year in India. Panels facing east or west, or laid completely flat, produce less. On flat roofs we use a 10 to 15 degree tilt. Our guide to solar panel tilt angle and orientation explains the trade-offs.

Dust

In dry months, dust builds up quickly, especially near construction, farmland or busy roads. Uncleaned panels lose output. Regular cleaning keeps generation close to expected levels. See our solar panel cleaning guide.

Heat and airflow

Panels lose some output as they heat up. Raised structures that let air flow underneath keep them cooler. This is one reason our flat-roof installations use elevated frames.

Equipment and installation quality

Undersized cables, poor connectors and badly configured inverters all lose energy. We use correctly sized cable (4 sqmm DC and 4 sqmm 2-core AC) and Stäubli-grade MC4 connectors to keep these losses low.

Panel type

Newer panel types such as TOPCon generally handle heat a little better and degrade more slowly than older types. See our types of solar panels guide.

Age

Panels slowly lose some output over the years. Performance warranties (25 years on the panels we install) guarantee that most of the rated output remains.

Turning units into savings

Units become money through your electricity tariff. For planning, our calculators use a flat assumption of ₹8 per unit for domestic consumers and ₹10 per unit for commercial consumers. Real tariffs vary by DISCOM and slab, but this gives a reasonable estimate.

At ₹8 a unit:

• a 3 kW system producing about 4,650 to 4,800 units a year is worth roughly ₹37,000 to ₹38,000 a year;
• a 5 kW system producing about 7,750 to 8,000 units a year is worth roughly ₹62,000 to ₹64,000 a year.

How much of this you actually save depends on how much of your solar you use and how net metering credits the rest. Our article on what "prosumer" means explains how exported units appear on your bill, and our import and export units guide explains how to read the meter.

For your own numbers, use our solar vs bill calculator or our rooftop solar savings calculator.

Sizing a system from your bill

Work backwards from your use:

1. Look at your electricity bills for the last 12 months and find your average monthly units.
2. Divide by about 130, the average monthly units from 1 kW in our region.

Examples:

• A home using 400 units a month needs about 3 kW (400 ÷ 130 ≈ 3.1).
• A home using 650 units a month needs about 5 kW (650 ÷ 130 = 5).
• A home using 250 units a month needs about 2 kW.

Round to a practical size and adjust for your roof space, shading, sanctioned load and plans (such as adding an AC or an electric vehicle). Our roof area to kW calculator checks whether your roof can fit the size you need.

Do not size from a single bill. Summer bills with heavy AC use and winter bills can be very different.

How to check whether your system is producing what it should

Most inverters have an app or display that shows daily, monthly and lifetime generation. Here is how to judge your system:

1. Use a full year. Compare your annual total with 1,550 to 1,600 units per kW.
2. Compare like with like. Compare a clear summer day with a clear summer day, not with a monsoon day.
3. Watch for sudden drops. A sudden fall in output on clear days usually means dirt, new shade, a tripped breaker, a loose connector or an inverter fault.
4. Compare months year to year. March this year should look like March last year.

If your system is well below these figures over a full year, or drops suddenly, ask your installer to investigate. Our maintenance visits every three months include checking generation against expectations, and we respond within 48 hours to reported issues.

Common questions about generation

Does a 1 kW system really produce 4 units a day every day?

No. 4.2 to 4.4 is the annual average. Clear days in the strong months produce more; cloudy monsoon days produce much less.

Why is my system producing less in summer when it is so sunny?

Two common reasons: heat reduces panel output a little, and dust builds up quickly in dry months. Clean the panels and check the app on a clear day.

Does solar work on cloudy days?

Yes, but at reduced output. On heavily overcast days, generation can fall a long way. It recovers as soon as the sun returns.

Will my system produce power during a power cut?

Not if it is a standard on-grid system. For safety, grid-tied inverters shut down when the grid fails. You need a hybrid system with batteries for backup. See our hybrid inverter guide.

Is Hyderabad generation the same as Anantapur?

The two regions have broadly similar sunshine, and our planning figures are a sound starting point for both. Local factors such as dust, haze and shading matter more than the city itself.

What this means for your decision

• Size from your units, not from a package.
• Plan with 1,550 to 1,600 units per kW per year, or about 130 units per kW per month.
• Protect generation with good design: no shade, the right tilt and good airflow.
• Keep panels clean and the system maintained.
• Track your app so you notice problems early.

How Origian helps you get the expected output

Every system we install is designed for real-world generation:

• shade mapping during the site visit;
• raised, galvanised structures at a 10 to 15 degree tilt on flat roofs;
• panels from Renewsys, Adani, Waaree and Tata, with Growatt, Solis and Goodwe inverters;
• correctly sized cable and quality connectors;
• surge protection and dedicated lightning-arrestor earthing;
• maintenance every three months, with a 48-hour response commitment.

To see how many units a system on your roof could produce, book a free site survey, or see our solar system prices.

Units per day, explained simply

Some people find "units per kW per day" easier to plan with than annual totals. Using our regional figure:

• 1 kW ≈ 4.2 to 4.4 units a day on average.
• Add another kW, add roughly another 4.2 to 4.4 units a day.

So if your family uses about 13 units a day on average (around 400 a month), a 3 kW system broadly covers it. If you use about 20 to 22 units a day (around 600 to 650 a month), 5 kW is the better fit.

On a bright summer day a system will produce above this average; on a heavy monsoon day, well below it. Over a full year, the averages hold for a well-installed, well-maintained system.

What your inverter app shows, and what it means

Most inverter apps show:

• Today's generation (kWh): units produced so far today.
• Current power (kW): what the panels are producing right now. This rises through the morning, peaks around midday and falls in the afternoon.
• Monthly and yearly totals: the figures to compare against your expectations.
• Lifetime generation: total units since commissioning.

A few tips:

• Midday peaks below the system's rated kW are normal. Panels rarely reach their full rated output in real conditions, especially when hot.
• A flat line at zero during daylight means the system is not producing. Check the inverter for an error, and contact your installer.
• A day far below similar sunny days often points to dirt, a tripped breaker or a fault.

Generation and net metering on your bill

Your solar system's units appear in two places:

• Used directly: these never pass through the meter as imports, so they reduce what you buy.
• Exported: recorded on your net meter as export, and credited against your imports according to your DISCOM's rules.

Your bill shows import and export, not total generation. To see the whole picture, compare your inverter app's generation with the import and export figures on your bill. Our guide to import and export units explains how to read the meter.

A year in the life of a 5 kW system

Here is what a family with a 5 kW system in our region might see over a year:

• Total generation: about 7,750 to 8,000 units.
• Strongest months: the clear, dry months before the monsoon, with high daily output.
• Weakest months: the heaviest monsoon weeks, when cloud cover cuts daily output.
• Bill effect: in sunny months, exports build up credit; in the monsoon and on evenings, imports draw it down.

The exact pattern depends on your roof and habits, but the annual total is what matters for savings.

How to estimate your own system's yearly generation

You can make a reasonable estimate yourself before you talk to any installer:

1. Start with the system size in kW. For example, 4 kW.
2. Multiply by a regional figure. From Origian's installations in the Anantapur region, each kW produces about 1,550 to 1,600 units a year. For 4 kW, that is about 6,200 to 6,400 units a year.
3. Divide by 12 for a monthly average. About 515 to 535 units a month.
4. Adjust for your roof. If you have partial shade or the panels cannot face south, expect somewhat less.

This is an average. Actual months will be higher in the clear dry season and lower during the monsoon.

Why two neighbours get different numbers

People often compare notes with neighbours and find different results from systems of the same size. Common reasons:

• one roof has more shade from tanks, trees or nearby buildings;
• the panels face different directions or sit at different tilts;
• one system is cleaned more often;
• the equipment, cabling and connectors differ in quality;
• one system was commissioned later, so it is younger;
• they are measuring different things: one reads the inverter app, the other the net meter, which shows only exported units.

Before worrying, compare like with like: the inverter's total generation over the same period, for systems of the same size.

Frequently asked questions

How many units does a 1 kW solar system generate per day? In Telangana and Andhra Pradesh, a 1 kW rooftop solar system generates about 4 to 4.5 units a day on average, or about 1,550 to 1,600 units a year, based on Origian's installations in the Anantapur region. Clear dry days produce more; cloudy monsoon days produce less.

How many units does a 3 kW solar system produce per month? A 3 kW rooftop solar system produces about 400 units a month on average in our region, or about 4,650 to 4,800 units a year. At ₹8 per unit, that is worth roughly ₹3,200 a month. Actual months vary with the season, shade and how often the panels are cleaned.

How many units does a 5 kW solar system generate per day? A 5 kW rooftop solar system generates about 21 to 22 units a day on average in our region, or about 650 units a month. Clear days in the dry season produce more and cloudy monsoon days less, so judge the system on its monthly and yearly totals rather than single days.

How many units does a 10 kW solar system generate? A 10 kW rooftop solar system generates about 15,500 to 16,000 units a year in our region, or roughly 1,300 units a month on average, based on Origian's installations in the Anantapur region. Actual output depends on shade, orientation, tilt, cleaning and the season.

Do solar panels generate electricity on cloudy days? Yes, but less. Solar panels work on diffuse light, so they still generate on cloudy days, though output can fall well below a clear day. That is why monsoon months produce fewer units in Telangana and Andhra Pradesh, and why rooftop solar systems are sized on yearly averages.

How many solar panels do I need for 300 units per month? About 2.3 kW of rooftop solar covers 300 units a month in our region, since each kW produces about 130 units a month on average. In practice that means a 2 to 3 kW system; the panel count depends on the panel wattage. Size from 12 months of bills, not one month.

Why does my net meter show fewer units than my solar inverter? Your solar inverter shows everything the panels generate. The net meter shows only the units exported after your home has used what it needs at that moment. Both are correct; they measure different things. Compare inverter generation with expected output, and the net meter readings with your bill.