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Mech Power Engineering · Bangladesh

Solar Sizing & Savings Calculator

সোলারের প্রাথমিক হিসাব করুন

Estimate panel capacity, average generation and energy-charge savings from your own consumption and roof area. No sign-up is needed.

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Solar Sizing & Savings Calculator — illustrative solar installation
Illustrative solar scene. Equipment and layout depend on the project.
A preliminary planning tool, not a quotation or utility approval. Enter your actual energy tariff and consumption. The calculator assigns no cash value to exports.
1. Your electricity use
Use an average from recent bills. For BDT, exclude fixed charges, VAT and arrears.
Use your applicable energy rate. For slab or time-of-use billing, an average is only an approximation.
2. Your usable roof
Exclude obstructions and inaccessible roof areas.
Enter kW, not kVA. Used only for a preliminary grid-connected AC-capacity check.
3. Optional cost & backup inputs
Include storage and all installation costs if applicable.
Review or change assumptions
Utility-published planning baseline. Site-specific yield varies.
Includes layout allowances; not a structural assessment.
MPE starting assumption, editable.
Planning assumption. Adjust for daytime demand and, where relevant, storage losses.
Indicative ratio; equipment design must confirm it.

Your inputs stay in this browser. Choose “Share estimate” only if you want to open WhatsApp with a prepared message.

How the estimate works

Panels are sized to the chosen annual energy target, then limited by usable roof area and the optional sanctioned-load check. Panel kWp and inverter AC kW are displayed separately.

  • Annual generation = panel kWp × annual yield.
  • On-site energy = the smaller of generation × your on-site-use percentage and electricity consumption.
  • Savings = on-site energy × entered energy tariff. Exports are valued at zero.
  • Simple payback = entered project cost ÷ (annual energy savings − entered annual upkeep).
  • Battery energy = critical kW × backup hours ÷ (0.80 × 0.90). This is an energy-only starting estimate.

The model does not simulate hourly loads, seasonal battery autonomy, export-credit settlement, slab billing, financing, tax benefits, degradation or equipment replacement. Obtain a site survey and equipment-specific design before purchasing.

Bangladesh planning references · reviewed 24 October 2026

Final design, eligibility, costs, equipment warranty and availability are confirmed for each project. Consult current utility instructions before applying.