Generator or inverter? The decision is a spreadsheet, not a brand

Every power quote you receive is priced by kVA and Ah. What your house actually consumes is measured in watt-hours, and that arithmetic - five minutes with a notebook - decides whether your next power purchase feels like freedom or like a rented disappointment.

Step one: write your real load

For one honest week, list what you actually run during an outage and for how long: fridge (compressor cycles roughly a third of the hour, not full-time), fans, TV and decoder, router, lights, laptops, water pump. Nameplate watts are on each appliance's sticker; multiply by hours and add up - that's your watt-hour demand per outage. Most homes discover their "big generator instinct" is three times the actual need, and their "small inverter shortcut" is half the real one.

Step two: surges, not averages

Motors - fridge compressor, pumping jack, freezer, any borehole pump - pull two to three times their running watts for a few seconds on start. An inverter or generator sized to the sum of running watts will brown out on the evening the pump and fridge decide to wake up together. Sum the running watts, add the largest single motor's surge headroom, and buy against that number. This is the spec salespeople round down.

Step three: the battery rule

If you go inverter: usable capacity is roughly half your nominal kWh for lead-acid chemistry (deep cycling a car battery daily kills it in months - the "tubular" upgrade buys time, not immunity), and lithium tolerates much deeper cycles but still ages by heat. Nigerian roof-space heat is the silent budget-killer: a battery in a hot cupboard in year one is a replacement quote in year three. Ventilate the battery room, keep it off the floor, and ask for the installation's battery temperature story before you ask about warranty paper.

Where each one genuinely wins

• Generator: cheap energy per hour while you burn fuel, tireless through long outages, tolerant of a full house running at once. Its true costs are fuel price volatility, service intervals you must actually keep, and noise your neighbours are pricing into their own patience.
• Inverter + batteries: silent, instant, phone-charging-friendly, and the only option that becomes cheaper over time once solar panels join it. Its true cost is capacity bought upfront: you cannot "borrow" extra stored sunlight on a harmattan week.
• The hybrid answer almost everyone wants: a small generator wired to charge a real battery bank (changeover done by a licensed electrician with a proper changeover switch and earthing - the death-avoidance part of the diagram), so the generator runs at its efficient steady load to fill batteries instead of babysitting every bulb.

The check before you buy anything

Whatever the quote says, make it write: running watts covered, surge watts covered, battery chemistry and usable depth, and - if solar-ready - whether the inverter accepts panels today or needs a replacement later. A vendor who can answer those four questions in writing is selling a system. One who answers "trust me, it'll carry your house" is selling tomorrow's phone call.