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Battery Sizing Calculator for Pakistan Solar Backup

Calculate the battery capacity, amp-hours and indicative module count needed for essential loads during a power outage. Choose lithium or lead-acid assumptions and match battery voltage to your inverter.

Enter your system information

Use practical site values for a useful first estimate. All calculations run in your browser; no form data is sent from this tool.

01

Backup requirement

Start with the essential loads that must keep running during an outage.

kW

Enter only the loads required during a power outage.

hours

Choose the outage period you want the battery to cover.

02

Battery setup

Match the chemistry and voltage to the inverter and battery system you are considering.

The chemistry changes the usable depth-of-discharge assumption.

Select a voltage supported by the inverter and battery system.

Advanced assumptionsAdjust efficiency, reserve, discharge and module capacity.⌄
%

Use the battery manufacturer’s permitted value.

%

Use the selected inverter’s documented efficiency where available.

%

Capacity held back for load variation and planning uncertainty.

kWh

Replace with the actual usable capacity of your chosen module.

Battery sizing calculator questions

Should I size the battery for the whole house?

Usually, backup sizing starts with essential loads such as lights, fans, networking equipment, refrigeration and selected appliances. Enter only the loads that must run during a power outage, then discuss expansion with the installer.

Why does battery voltage matter?

At the same power, a lower-voltage battery bank requires more current. The battery voltage, continuous current, surge capability, BMS and inverter communication must all be compatible.

Can I use the module count as an order quantity?

No. The module count is an estimate based on the entered module capacity. Confirm usable energy, series/parallel limits, charge and discharge current, communications, enclosure requirements and the manufacturer’s approved configuration before ordering.