How the tools work

Methodology

Every result follows a visible path from your inputs, through a stated formula or model, to an estimate you can inspect.

Electricity bills

Inputs: Monthly units, rate or verified tariff details
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Logic: Apply the selected rate structure, fixed charges and additions
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Result: Monthly bill, annual cost and effective rate

Appliance consumption

Inputs: Wattage, quantity, daily hours, days and electricity rate
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Logic: Watts × hours ÷ 1,000, adjusted for quantity, load factor and standby use
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Result: Daily, monthly and annual kWh and cost

AC usage

Inputs: Rated input, daily use, days, tariff and editable load factor
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Logic: Rated power is reduced by the runtime/load factor before energy is calculated
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Result: Units, cost per hour and monthly/annual cost

Inverter sizing

Inputs: Connected load and safety margin
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Logic: Add the chosen headroom to the total running load
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Result: Planning inverter capacity; motor surge still needs checking

Battery backup

Inputs: Load, backup duration and battery-bank voltage
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Logic: Convert required usable energy to amp-hours using editable efficiency and usable-depth assumptions
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Result: Estimated battery-bank capacity

Solar sizing

Inputs: Monthly units or bill and rate, generation factor, losses and roof area
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Logic: Divide annual demand by expected annual generation per kW after losses
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Result: Capacity, annual generation, offset and roof requirement

Solar cost

Inputs: System size and a user cost range or installer quote
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Logic: Add system, battery and installation costs, then deduct only a user-entered subsidy
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Result: Gross and net project-cost range

Solar ROI

Inputs: Investment, generation, tariff, self-use, maintenance and projection assumptions
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Logic: Project each year with tariff escalation, degradation and maintenance
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Result: First-year saving, cumulative saving, payback and return

Solar subsidy

Inputs: Capacity, customer type, state or UT, and optional manual override
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Logic: Apply the verified PM Surya Ghar central CFA tier for the selected state category; keep separate state benefits outside the estimate
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Result: Central CFA estimate and optional net cost, with source and verification date

EV charging

Inputs: Distance or battery SOC, efficiency, tariffs and charging mix
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Logic: Convert driving to battery energy, adjust for charging loss, then split home/public cost
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Result: Grid units, charging loss, cost per km and annual cost

EV vs Petrol/Diesel

Inputs: Vehicle prices, efficiency, mileage, energy prices and ownership costs
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Logic: Accumulate purchase and yearly operating costs, including optional escalation and battery replacement
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Result: Total ownership difference and estimated break-even

Solar + EV

Inputs: Home use, EV distance and efficiency, existing solar and solar assumptions
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Logic: Add EV grid energy to home demand before applying the solar generation model
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Result: Home, EV and combined solar capacity plus roof area

All results are informational estimates. Verify important technical, financial, tariff, price and eligibility decisions with the relevant qualified provider or official source.