Run the numbers

The storage calculator

Does your battery investment add up?

Your bill. Your backup needs. A transparent 10-year view.
Start with your project or explore a worked example.

Last reviewed

Start with your electricity bill.

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Your project
01

Your business

Outage inputs are specific to your site.
Use your actual category’s applicable rates.
kWh
Imported energy shown on your bill.
%
25 means 25% of grid energy.
PKR/kWh
NEPRA 2026-02-11 reference; check your bill and edit for applicable adjustments.
PKR/kWh
NEPRA 2026-02-11 reference; check your bill. Flat tariff: use the charging rate.
02

Your backup needs

hours/day
Use your own records, not a city-wide guess.
kW
Average load you want the battery to cover.
%
100 = all; 0 = no existing diesel supply.
PKR/L
OGRA reference 2026-10-21; excludes secondary freight.
Check the published diesel price
03

Your battery plan

We size capacity and power from your backup needs, with charging power equal to discharge power. See the maximum installed price for a 3, 5 or 7 year payback. No market equipment price is assumed.

Fine-tune the assumptions

Editable scenario assumptions, not market forecasts. Demand-charge savings and solar surplus are excluded until they can be verified.

Usable AC is not derated twice.
days
365 assumes year-round use.
hours
 
hours
 
%
 
%
 
%
Default 95% is an assumption; verify your system.
L/kWh
0.30 is an editable assumption, not a measured default.
PKR/kWh
0 excludes maintenance savings; enter your estimate.
PKR
0 excludes this cost; replace with your service quote.
%
2.5 means 2.5% per year.
%
12 means 12%; not a financing offer.
%
0 assumes no price growth.
%
 
%
 
year
0 means no replacement assumed.
PKR
A year is required if greater than zero.
PKR/hour
Shown separately; excluded from financial returns.
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A clear answer starts here

Your inputs.
The full picture.

Add your bill and backup needs to see an installed price ceiling, or enter a quote to calculate payback.

  • Diesel savings after charging costs
  • Simple payback, NPV and IRR
  • 10-year costs and sensitivity
No verified installed-price average or city-wide outage default is used.