Load calculator
Your home, in watts
Add the appliances you want to keep running when the grid goes off. We work out the inverter, battery, solar and generator size you need, and which package fits.
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How we calculate
The numbers behind the numbers
Inverter
Running load divided by a power factor of 0.8, plus 25 percent headroom, rounded up to a standard size.
Battery
Your daily energy for the backup hours you choose, at 90 percent usable lithium capacity.
Solar
Daily energy divided by 4.5 peak sun hours in Owerri and 78 percent system efficiency.
Surge
Running load plus twice the largest motor, because fridges, ACs and pumps start hard.
Generator
Sized for the surge, not the running load, so it does not stall.
Duty cycle
Fridges and ACs cycle on and off, so we count only the time the compressor runs.
Questions
About sizing
Why is my inverter bigger than my load?
Inverters should not run flat out for hours. Headroom keeps them cool and lets motors start without tripping.
Can I run an AC on an inverter?
Yes, with at least 5 kVA and enough battery or solar. Inverter type ACs are much easier to power.
Do I need solar?
Not always. Without solar, the grid or a generator recharges the battery. Solar means you rely on neither.
What about an electric cooker?
Electric cookers and water heaters need very large systems. We usually advise gas for cooking and heating.
New Owerri, Imo State
Happy with your numbers?
Send them to an engineer for a free survey, or compare our packages.