EXPONENT NRG

Battery Backup Calculator

Replace the illustrative starting values with your site data. Review the assumptions before using a result.

FROM REQUIREMENT TO DELIVERY

Define the business challenge
Compare relevant solutions
Review the technical case
Assess the site and economics
Discuss project delivery

Your operating scenario

Continue with a relevant solution

Start with critical load, outage duration and operating consequences. Select the architecture and battery technology against that duty cycle.

Industrial Backup Power

Separate essential processes from deferrable demand, then coordinate storage, generators and controls to meet the required continuity level.

YOUR NEXT STEP

Turn this requirement into a project brief.

Share your site, operating priorities and available data. Start with an assessment, arrange a survey where needed, then discuss the project scope.

Request an On-Site Energy Assessment Discuss a Project

ENGINEERING SCREENING

Explore a first-pass project estimate

Enter site data and your own commercial assumptions. Outputs update as inputs become valid; use Calculate Estimate for a deliberate refresh.

All calculations are indicative baseline estimates subject to detailed on-site power quality logging and engineering validation.

BESS sizing + diesel displacement

Estimate battery energy, generator fuel displaced, recharge cost and operational emissions for the stated events.

Critical duty and battery design

Battery nameplate sizing includes the entered load factor, efficiency, usable depth of discharge and capacity reserve.

Critical load (kW)Required discharge duration (hours)Equivalent events (events/year)Average load as share of peak (%)Illustrative technical starting value; replace with measured duty data.Discharge-path efficiency (%)Illustrative technical starting value; use the selected system's warranted discharge value for nameplate sizing.Round-trip efficiency (%)Illustrative technical starting value; use the selected system's warranted round-trip value for recharge-energy estimation.Usable depth of discharge (%)Illustrative technical starting value; confirm usable limits with the selected system.Capacity available at design point (%)Illustrative technical starting value representing design reserve/retention; validate for the duty and life target.

Diesel, energy and emissions assumptions

Emissions are operational estimates from the factors you enter; lifecycle, upstream and embodied emissions are excluded.

Generator fuel consumption (L/kWh displaced)Diesel price (BDT/L)Recharge electricity cost (BDT/kWh)Grid emissions factor (kg CO₂e/kWh)Diesel emissions factor (kg CO₂e/L)

User-supplied installed cost and O&M

Use project-specific quotations. PCS sizing uses the entered critical peak kW as the screening power basis.

Battery installed cost — lower (BDT/kWh)Battery installed cost — upper (BDT/kWh)PCS installed cost — lower (BDT/kW)PCS installed cost — upper (BDT/kW)Annual O&M (% of installed CAPEX/year)

Complete the required assumptions to see a screening estimate.

These screens do not include financing, tax, battery or inverter replacements, degradation over time, export revenue, or a bankable forecast. Operational savings and emissions are estimates based only on the assumptions entered. Simple payback is first-year net operating savings against installed cost, held level; it is distinct from a full cash-flow model such as SAM discounted payback (see SAM financial models). Lifecycle value is shown only when period and discount assumptions are supplied; no LCOE is calculated.