Solar Bill Savings Calculator
See month-by-month how much a rooftop solar system cuts your electricity bill, separating self-consumed units from exported ones and their different rates.
ఇక్కడ ప్రారంభించండి
- ఏమి నమోదు చేయాలి
- సిస్టమ్ సామర్థ్యం, సగటు నెలవారీ యూనిట్లు, మీరు చెల్లించే యూనిట్ ధర, ఎగుమతి యూనిట్‌కు డిస్కం ఇచ్చే ధర ఇవ్వండి.
- ఫలితం అర్థం
- ఇంట్లో వాడే యూనిట్లు మీ ధరతో ఆదా చేస్తాయి; మిగిలినవి మాత్రమే ఎగుమతి అవుతాయి, సాధారణంగా తక్కువ ధరకు.
ఉదాహరణ, పరిమితులు చూడండి
- సులభ ఉదాహరణ
- 3 kW సిస్టమ్ నెలకు సుమారు 360 యూనిట్లు ఉత్పత్తి చేస్తుంది; 300 యూనిట్ల వాడకంతో ₹8 ధరకు సుమారు ₹2,880 ఆదా; సుమారు 60 యూనిట్లు తక్కువ ధరకు ఎగుమతి.
- గుర్తుంచుకోండి
- స్థిర ఛార్జీలు, మీటర్ అద్దె, పన్ను చెల్లించాల్సి ఉంటుంది; బిల్లు సున్నా కాదు. ఉత్పత్తి ఒక అంచనా, హామీ కాదు.
మీ ఫలితాన్ని లెక్కించండి
మీ సంఖ్యలు నమోదు చేయండి. మార్చినప్పుడు అంచనా, చార్ట్‌లు నవీకరించబడతాయి.
నెలవారీ బిల్లు పొదుపు
స్వీయ వినియోగ యూనిట్లు మీ స్వంత టారిఫ్ ప్రకారం ఆదా చేస్తాయి; మిగులు మాత్రమే ఎగుమతి అవుతుంది, ఎగుమతులకు సాధారణంగా తక్కువ జమ అవుతుంది. స్థిర ఛార్జీలు చెల్లించాల్సి ఉంటుంది.
- మొదటి సంవత్సరం పొదుపు
- ₹31,469
- మీ యూనిట్ల బిల్లును 109.3% తగ్గిస్తుంది
- ఇంట్లో వాడినవి
- 3,600 units
- మీ టారిఫ్ ప్రకారం ₹28,800 ఆదా
- ఎగుమతి
- 889 units
- ₹2,668 జమ
నెలవారీగా
| నెల | ఉత్పత్తి | వాడినవి | ఎగుమతి | ఆదా |
|---|---|---|---|---|
| జన | 381 | 300 | 81 | ₹2,644 |
| ఫిబ్ర | 344 | 300 | 44 | ₹2,533 |
| మార్చి | 381 | 300 | 81 | ₹2,644 |
| ఏప్రి | 369 | 300 | 69 | ₹2,607 |
| మే | 381 | 300 | 81 | ₹2,644 |
| జూన్ | 369 | 300 | 69 | ₹2,607 |
| జూలై | 381 | 300 | 81 | ₹2,644 |
| ఆగ | 381 | 300 | 81 | ₹2,644 |
| సెప్టెం | 369 | 300 | 69 | ₹2,607 |
| అక్టో | 381 | 300 | 81 | ₹2,644 |
| నవం | 369 | 300 | 69 | ₹2,607 |
| డిసెం | 381 | 300 | 81 | ₹2,644 |
ఎక్కువ ఉత్పత్తి ఇంట్లోనే వినియోగమవుతోంది, కాబట్టి అది మీ సొంత టారిఫ్ వద్ద యూనిట్లను భర్తీ చేస్తుంది — ఇదే అత్యధిక విలువైన ఆదా.
మీ లెక్కను అర్థం చేసుకోండి
Solar savings come from two different things with two different values. Units you use in the house while the sun is shining offset units you would otherwise buy at your own retail tariff, which is the valuable saving. Only the surplus after the house is supplied is exported, and exports are usually credited below that tariff. This calculator builds the saving month by month: it generates the units, allocates them to your own consumption first, and credits the remainder at the export rate you enter. A 3 kW system at the default 4.1 units per kW per day generates about 4,490 units a year, which is close to a 375-unit monthly household.
Solar Bill Savings Calculator ను ఎలా ఉపయోగించాలి
- 1
Enter the system size
The capacity in kW, ideally the size confirmed by a site survey rather than the quote headline.
- 2
Enter average monthly units
Average the units from several bills so one summer month does not skew the estimate.
- 3
Enter your effective tariff
Use the energy charge you actually pay per unit. If your bill shows slab rates, divide the total energy charge by the units billed to get the effective rate.
- 4
Enter the export rate
Use the rate your discom credits exported units at. Setting it to zero gives the conservative case where exports earn nothing.
ఉదాహరణ
A 3 kW system against a 300-unit monthly bill
3 kW installed, 300 units consumed a month, an effective tariff of ₹8 a unit and an export rate of ₹3 a unit. A 31-day month generates 3 × 4.1 × 31 = 381 units: 300 are used at home (₹2,400) and 81 are exported (₹243), so that month saves ₹2,643. Over the year, 3,600 units × ₹8 = ₹28,800 plus 889 units × ₹3 = ₹2,668 gives ₹31,469, against a units bill of 3,600 × ₹8 = ₹28,800.
- Annual generation
- 4,490 units
- Units used at home
- 3,600 units at ₹8 = ₹28,800
- Units exported
- 889 units at ₹3 = ₹2,668
- First-year saving
- ₹31,469
- Saving as a share of the units bill
- 109.3% (export credit pushes it past 100%)
- Fixed charges
- unchanged, still payable
The exported units earned ₹3 each while the same units used at home would have saved ₹8. Sizing closer to the household's own consumption raises the value of every unit generated.
ఇది ఎలా లెక్కించబడుతుంది
Each month gets its own generation figure: capacity × units per kW per day × days in the month, using 4.1 units per kW per day by default and the real length of each month. That's why February comes out lower than March even at the same capacity.
Generated units go to the household first, up to that month's consumption. Self-consumed units save money at your own tariff: min(generation, consumption) × tariff per unit.
Only the remainder is exported, and exports are credited separately: max(0, generation − consumption) × export rate. The month's saving is the sum of the two, and the yearly figures add up the unrounded monthly values before rounding to the nearest rupee.
The share of the units bill is first-year saving ÷ (monthly units × 12 × tariff), so it can go above 100% when export credit is counted. Fixed charges, meter rent and electricity duty sit outside this calculation and aren't reduced by solar.
అనుమానాలు మరియు పరిమితులు
- Generation is a planning value of 4.1 units per kW per day, spread over real month lengths with no seasonal shape applied beyond that.
- Degradation is not applied in the first-year view; it is modelled in the payback calculator over the system lifetime.
- The effective tariff is user-supplied. Slab rates, time-of-day tariffs and other charge components are not reconstructed from your bill.
- Export credit is treated as an offset against the electricity account. The settlement frequency, carry-forward rules and caps vary by state.
- Fixed charges, meter rent, electricity duty and taxes are shown separately and are not reduced by solar.
తరచుగా అడిగే ప్రశ్నలు
How much does a 3 kW solar system save per month?
It depends on two prices. A 3 kW system generates roughly 360 units in an average month. At an effective tariff of ₹8 a unit, units used at home save about ₹2,880, while exported units are credited at a lower rate, often ₹2 to ₹3 each.
Are exported units paid at the same rate as the units I buy?
Usually not. Many states credit exports at a rate below the retail tariff, and some have moved to net billing where the import and export prices differ. Enter your discom's export rate to see the difference.
Will my electricity bill become zero?
Almost never. Solar offsets unit charges. Fixed charges, meter rent, electricity duty and other non-unit components stay on the bill, and any consumption above generation is still charged at your slab rate.
What happens in the monsoon?
Generation falls, so a system sized to an annual average will import more units in those months. The monthly table shows where this happens so the annual saving is not mistaken for a steady monthly one.
Does solar save less if I am away during the day?
Yes. Solar saves most when generation and consumption happen at the same time. If the house is empty during daylight hours, more units are exported at the lower rate unless you shift heavy loads or add a battery.
Does the saving increase over the years?
Tariff rises increase the value of self-consumed units, while panel degradation reduces generation slightly each year. The payback calculator models both, along with maintenance and an inverter replacement.
చివరి మాట
The saving is not one number. It is the units you use yourself at your own tariff, plus whatever surplus the discom credits at its export rate. Once those two are separated, the case for a right-sized system becomes obvious: every unit used at home is worth two to four times an exported unit in most states, so consumption should set the size and exports should be treated as a bonus, not the plan.
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