Inverter battery in Nigeria: which to buy and how many
Most people who search for an inverter battery want to know three things: which one to buy, how many they need, and how long it will run the lights and fridge. This guide answers all three in plain language, with worked sums you can copy for your own home.
Which type to buy
| Type | Strengths | Watch out for |
|---|---|---|
| Tubular lead-acid | The usual choice for home inverters. Built for deep, repeated discharge. Widely sold and serviced. | Needs topping up with distilled water, ventilation and the right charger. Heavy. Should not be drained deeply every day. |
| Gel / AGM (sealed) | No topping up. Cleaner for indoor use. | Usually costs more per unit of storage. Needs the correct charge setting. |
| Lithium (LiFePO4) | Lighter, deeper usable capacity and many more charge cycles. No watering. | Higher price up front. Must suit your inverter's charging and communication. Buy from a seller who can support it. |
Car batteries are not inverter batteries. They are built to give a short burst, not to be drained slowly again and again, and they fail quickly in this job.
How much of the label can you actually use?
A battery's label gives its capacity in amp-hours (Ah) at a voltage. Multiply them for watt-hours: a 12 V 200 Ah battery stores about 2,400 Wh.
Lead-acid batteries last much longer if you use only around half of that each day, so plan on about 1,200 Wh usable from that battery. Lithium can usually be used much deeper. The inverter also loses some power as heat, so allow roughly 10 to 15 percent for that.
How many batteries do you need?
The first answer comes from your inverter's system voltage. Batteries are joined in series to reach it: one 12 V battery for a 12 V system, two for 24 V and four for 48 V. Joining batteries in series adds voltage and keeps the Ah the same. Joining them in parallel adds Ah and keeps the voltage.
| System voltage | Batteries | Stored energy | Usable (about half) |
|---|---|---|---|
| 12 V | 1 | 2,400 Wh | about 1,200 Wh |
| 24 V | 2 in series | 4,800 Wh | about 2,400 Wh |
| 48 V | 4 in series | 9,600 Wh | about 4,800 Wh |
Do not mix old and new batteries, or different makes or sizes, in the same bank. The weakest one drags the rest down and shortens everyone's life.
How long will it run my load?
Example: a 24 V bank of two 200 Ah tubular batteries has about 2,400 Wh usable. After about 15 percent inverter losses that is roughly 2,000 Wh. A 400 W load would run for about 5 hours. Double the load and you halve the time.
Real runtime is shorter in old batteries and when the load includes a fridge compressor that starts and stops. Use our calculator for a fuller estimate.
- Add up the watts of the appliances you will run together, for example lights, TV, fan and fridge.
- Take the usable battery energy from the table above.
- Take off roughly 10 to 15 percent for inverter losses.
- Divide by your load in watts to get hours.
Charging and what shortens battery life
- Use the charge current the maker recommends. For lead-acid it is commonly around a tenth of the Ah rating, so ask for the figure for your model.
- Charging from solar needs a controller that suits the battery type, and the right charge settings on the inverter.
- Draining to empty again and again is the fastest way to ruin lead-acid.
- Heat shortens life. Keep the batteries in a cool, ventilated place, away from direct sun and not in a sealed cupboard.
- Top up flooded tubular batteries with distilled water only, and keep the terminals clean.
What to check before you buy
- Look for the manufacturing date. A battery that has sat in a shop for a year or more has already aged.
- Compare the weight and the Ah rating of different brands. A big Ah number on a light battery is a warning sign.
- Ask for the warranty terms in writing: how many years, what counts as a fault and who replaces it.
- Ask what happens in the warranty if the battery is used with solar.
- For lithium, ask which inverters it is compatible with and whether it has a battery management system with protection.
- Buy from a seller with a shop you can visit, and keep the receipt and serial number.
Before you buy an inverter battery
- Check the inverter's system voltage: 12, 24 or 48 V.
- Choose tubular, gel or lithium for your budget and use.
- Buy matching batteries from the same batch, and never mix old with new.
- Work out usable watt-hours and divide by your load to get hours.
- Check the manufacturing date, weight and warranty terms.
- Make sure the charger settings and ventilation suit the type.
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Frequently asked questions
Which is the best inverter battery in Nigeria?
There is no single best one. Tubular lead-acid is the common, affordable choice for homes, sealed gel or AGM suit indoor use, and lithium costs more but lasts longer and weighs less. Choose by your budget, how often you will drain it and what your inverter supports.
How many batteries do I need for a 5 kVA inverter?
Most 5 kVA inverters run at 48 V, which means four 12 V batteries in series as a minimum. More capacity comes from adding more strings of four. Check your inverter's voltage first.
Can I use a car battery with an inverter?
It will run, but a car battery is built for short bursts and fails fast when it is discharged slowly and repeatedly. Use a battery made for deep cycling.
How long does an inverter battery last?
It depends on type, how deeply you drain it, the heat and the charger. Lead-acid used well often lasts a few years, and lithium usually lasts longer. Look at the warranty and ask how it handles daily use.
Why does my battery drain so fast?
Common causes are an old or weak battery, a load larger than you think, a charger that is not charging fully, or loose and corroded terminals. Our maintenance guide lists what to check.