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Inverter & Battery Backup Calculator

Calculate backup time and find the right inverter and battery bank for your power requirements.

Enter a value between 50W and 10,000W.

Formula

Inverter VA: Load ÷ (0.8 × 0.85) × 1.20
Backup Time: (Battery Ah × System Voltage × 0.75) ÷ Load
Required Battery Ah: (Load × Desired Backup Hours) ÷ (System Voltage × 0.75)
System Voltage: Based on connected load range.

Solar Panel Size Calculator

Calculate the required solar system capacity and number of panels based on your energy consumption.

Enter the average peak sunlight hours available per day.
Enter a panel wattage between 100W and 800W.

Formula

Solar Capacity Needed: Daily Energy Consumption ÷ (Peak Sun Hours × 0.75)
Total Panels: (Solar Capacity × 1000) ÷ Panel Wattage
Installed Capacity: (Total Panels × Panel Wattage) ÷ 1000

Electrical Load Calculator

Calculate your total electrical load in watts, kilowatts, and equivalent horsepower.

Typical AC PF: 0.8 - 1.0

Formula

DC: P = V × I
AC Single Phase: P = V × I × PF
AC Three Phase: P = 1.732 × V × I × PF
Kilowatts: kW = Watts ÷ 1000
Horsepower: HP = Watts ÷ 746

MCB Size Calculator

Estimate the appropriate MCB rating based on your electrical load, system type, and safety margin.

Formula

Single Phase Current: I = P ÷ (230 × PF)
Three Phase Current: I = P ÷ (1.732 × 415 × PF)
Target Current: Operating Current × 1.25
MCB Rating: Next standard MCB rating above target current

Energy Consumption Calculator

Calculate electricity consumption and estimate your electricity bill from appliance usage.

Enter a value between 0 and 24 hours.
Optional. Enter your electricity tariff to estimate cost.

Formula

Energy Consumption: (Appliance Watts × Daily Hours × Billing Days) ÷ 1000
Electricity Cost: Energy Consumption × Tariff Rate
1 Unit: 1 Unit = 1 kWh

House Wire Size mm Calculator

Calculate the required wire size based on electrical load, distance, voltage, and safety requirements.

Enter the surrounding temperature where the cable will be installed.

Formula

Wire Size Formula
Idesign = Iload × (1 + SF / 100)
Irequired = Idesign / Ktotal
Size = Irequired / Density
Symbol Definitions
Iload = Load Current (A)
SF = Safety Factor (%)
Ktotal = Temperature Derating Factor
Density = Allowable Current Density (A/mm²)
V = Supply Voltage (V)
L = Cable Length (m)

Recommended Wire Size

Calculated Wire Size -
Recommended Standard Size -
Design Current -
Temperature Factor -
Cable Length -
This is an estimated wire size based on the supplied load, ambient temperature, and safety factor. Final cable selection should also consider voltage drop, installation method, cable insulation, grouping, and applicable electrical standards.