Calculate, compare, understand, decide

Home Energy Savings Planner

Combine appliance upgrades and rooftop solar into one plan with baseline cost, savings by improvement, investment and payback, without double-counting overlaps.

This planner reuses TechVodka's Appliance Upgrade and Solar ROI engines. Solar generation per kW is your own figure because no location profile is deployed; no export credit is assumed.

Your home nowCurrent monthly electricity usekWh

From your bill, or the Home Energy Audit total.

Average electricity rate₹/kWh

Optional rooftop solarRooftop solar size (0 for none)kWExpected yearly generation per kW (optional)kWh/kW/year

From an installer estimate or the Monthly Solar Generation calculator.

Solar cost after any confirmed subsidy₹Solar yearly maintenance₹/yearShare of solar that replaces bought units%

Lower this if surplus daytime generation is not credited.

Appliance upgrades

Avoid listing the same appliance twice; overlapping savings are capped at your total use.

Upgrade 1

UpgradeOld powerWNew powerWHow manyHours/dayTotal cost₹

Upgrade 2

UpgradeOld powerWNew powerWHow manyHours/dayTotal cost₹

Smart result

Your estimate will appear here

—based on your details

Change any editable assumption, calculate, then review the steps, assumptions and limitations before deciding.

How this estimate works

Each appliance upgrade is evaluated with the Phase 1 Appliance Upgrade Savings engine. Upgrades are applied first and capped at your total use; solar is then applied only to the units you still buy, and valued with the Phase 1 Solar ROI engine. Surplus solar earns nothing because no export rate is assumed.

Formula

Upgrade saving = (old W − new W) × quantity × hours × 30 ÷ 1,000 kWh/month
Useful solar = min(kW × kWh/kW/year × offset %, (baseline − upgrade saving) × 12)
Payback = investment ÷ first-year net saving

Limitations

A flat average rate is used; slabs, fixed charges and taxes are not modelled.
Rated watts are an imperfect proxy for cycling appliances.
Solar generation per kW is your own figure.

Data used

No official dataset is used. Formulas are reused from the Phase 1 Appliance Upgrade Savings and Solar ROI engines.

Methodology Data sources My Decision Report

Electricity billEstimate your monthly electricity bill from consumption and tariff details.Home energy auditBuild a ranked home appliance inventory to find monthly electricity use, cost contribution and practical savings opportunities.Appliance upgrade savingsCompare an existing and replacement appliance to estimate energy savings, payback and multiyear net savings.Solar system sizeEstimate a suitable rooftop solar capacity from your electricity use.Solar costEstimate the installed cost range for a rooftop solar system.Solar ROIEstimate solar savings, payback period, and long-term return.

Frequently asked questions

Why is the combined saving less than upgrades plus solar separately?+

Once upgrades cut your use, solar has fewer bought units to replace. Counting both in full would save the same unit twice.

Where do I get generation per kW?+

From an installer's estimate or the Monthly Solar Generation calculator using your location's solar hours.

How accurate is this home energy savings plan?+

It will provide an indicative estimate based on your inputs and the stated assumptions. Actual results can vary by location, equipment, tariff, and usage.

Can I use the result to make a purchase?+

Use it as a starting point, then confirm current prices, specifications, eligibility, and site requirements with a qualified provider.