Pick the appliances you want to power, and get an instant inverter, battery and solar panel size — with full cost.
With 12hrs of grid power, you have about 12hrs of outage per day. Suggested backup: 0.5 days.
Suggested voltage for your load: 12V
Nigeria averages 5–6 peak sun hours/day; coastal/southern areas trend lower, northern areas trend higher.
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Each appliance you select contributes its running watts (quantity × watts × hours/day) to your daily energy use, which drives battery and panel sizing. For the inverter, we don't simply multiply every appliance by its starting-surge factor — fridges, ACs, freezers and pumps all have inductive motors that draw 2–3× their running watts for a moment at start-up, but they rarely all start at exactly the same instant. Instead, we size the inverter for your total running load plus the single largest individual surge, which reflects the realistic worst case. Battery capacity is calculated from your daily energy use, backup days, and your battery type's usable depth-of-discharge — lithium batteries can be discharged much further than lead-acid before damage, so a lithium bank needs less rated capacity for the same usable energy. Panel count comes from your daily energy use divided by your location's peak sun hours and a system derating factor that accounts for cabling losses, inverter efficiency, and panel soiling.
Use our complete Estimator for a full building cost breakdown and itemised Bill of Quantities.