Load Calculator

Select your actual appliances, quantities and usage hours, choose your required backup duration, and get a detailed inverter, lithium battery and solar-panel recommendation.

1. Select Your Appliances

Fan

~75W each (estimate)

Ceiling or standing fan, average speed.

Bulb

~15W each (estimate)

LED bulb. Older energy-saver bulbs may draw more.

Water Heater

~1500W each (estimate)

Immersion/instant water heater. Resistive load -- no meaningful surge.

Refrigerator

~150W each (estimate)

Medium household fridge. Compressor start-up causes a surge.

Washing Machine

~500W each (estimate)

Motor start-up causes a surge, especially during the spin cycle.

Television

~120W each (estimate)

LED/smart TV, average screen size.

Air Conditioner

Inverter AC estimate -- replace with the wattage on your unit's energy label. Not every AC of the same HP uses exactly the same wattage.

Wi-Fi Modem

~15W each (estimate)

Pressing Iron

~1200W each (estimate)

Resistive heating element -- no meaningful surge.

Phone Charger

~10W each (estimate)

Laptop

~65W each (estimate)

Pressure Pump

~750W each (estimate)

Motor start-up causes a significant surge.

Microwave

~1200W each (estimate)

Water Pump

~750W each (estimate)

1 HP water pump estimate. Motor start-up causes a significant surge.

Freezer

~200W each (estimate)

Compressor start-up causes a surge.

Home Theatre

~100W each (estimate)

Decoder

~20W each (estimate)

Don't see your appliance or device?

2. Your Selected Appliances

No appliances selected yet. Add appliances from the list to build your system.

3. Required Backup Duration

Or enter a custom value (hours)

Calculation Assumptions

Power factor: 0.80
Inverter safety margin: 25%
Inverter efficiency: 90%
Lithium battery depth of discharge: 80%
Solar system losses: 20%
Peak sun hours (Nigeria estimate): 5 hrs/day

Add your appliances and tap Calculate My System to see your personalised inverter, battery and solar recommendation.