How to Choose the Right Inverter for Your Home in Nigeria

An undersized inverter may overload, shut down or struggle when appliances start. An excessively large inverter may increase the purchase cost without improving your experience if the battery bank and charging arrangement are not properly matched.

Correct sizing helps you to:

• Power your selected appliances safely and reliably
• Allow for the starting surge of appliances with motors or compressors
• Achieve a realistic battery runtime
• Avoid unnecessary overloads and repeated shutdowns
• Plan for future additions without overspending today
• Protect the long-term performance of the inverter and batteries

Important: inverter capacity and battery capacity are related, but they are not the same thing. The inverter determines how much load the system can carry at a time. The battery bank largely determines how long that load can run, subject to battery condition, allowable depth of discharge and system losses.

Start with your essential appliances rather than every electrical item in the house. The aim is to identify what must remain available during an outage.

A typical essential-load list may include:

• LED lights
• Television and decoder
• Fans
• Wi-Fi router
• Laptop computers and phone chargers
• Refrigerator or freezer, where required
• Selected security or home-office equipment

High-consumption heating appliances, such as electric irons, kettles, water heaters, hot plates, microwaves and some air conditioners, can increase the required inverter capacity quickly. Do not assume they can be added simply because the inverter powers your lights and television comfortably.

Check the wattage label or manual for each appliance and add the wattages of the appliances you expect to use at the same time. This is your estimated simultaneous running load, not the total wattage of everything you own.

For example:

• 2 fans at 70 W each: 140 W
• 1 television: 100 W
• 6 LED bulbs at 10 W each: 60 W
• 1 Wi-Fi router: 15 W
• 1 laptop: 65 W

Estimated running load: 380 W

The figure above is only an illustration. Actual appliance ratings vary, so use the information on your own devices. You should also leave reasonable headroom above the calculated running load rather than operating the inverter continuously at its limit.

For a faster first estimate, use the Hausstrom Inverter Load Calculator. A qualified installer should still confirm the final selection, cable sizes, protections and battery configuration.

Some appliances briefly require more power when they start than they use while running. Refrigerators, freezers, water pumps and other motor-driven appliances are common examples. This temporary demand is called starting or surge power.

An inverter may appear large enough based on running watts but still trip when a motor or compressor starts. If your essential-load list includes these appliances, confirm both the inverter’s continuous output and surge capability. The appliance manufacturer’s rating and an installer’s assessment are safer guides than a general assumption.

Home inverters are commonly labelled in VA or kVA, while many appliances are labelled in watts. These figures are not automatically interchangeable because the usable watt output depends on the inverter’s design and power factor.

For this reason, do not choose an inverter by multiplying or dividing a kVA figure using an unverified internet rule. Check the product’s stated continuous watt output and surge rating, then compare them with your calculated load and required headroom.

As a practical buying sequence:

1. Calculate the appliances that will run together.
2. Add a reasonable allowance for headroom and future needs.
3. Check for appliances with high starting surge.
4. Match the result to the inverter’s verified continuous and surge ratings.

After sizing the inverter for load, determine the runtime you need. Two homes can use the same inverter capacity but require different battery banks because one household needs two hours of power while the other needs eight hours.

Battery runtime is affected by:

• The total load being powered
• Battery voltage, ampere-hour capacity and quantity
• Battery type and recommended depth of discharge
• Battery age, condition and maintenance
• Inverter efficiency and other system losses
• How often the battery is discharged and fully recharged

For homes that require dependable storage for regular power outages, properly selected tubular batteries can form part of a suitable power backup system. The correct choice still depends on the required runtime, system voltage and charging conditions.

A battery bank is useful only when the available charging source can restore the energy used. Before choosing a system, consider how often public power is available, how long it remains available and whether you will also charge with a generator or compatible solar arrangement.

Ask the installer or supplier:

• Can the inverter charge the proposed battery bank within my usual electricity window?
• Is the charging current appropriate for the battery type and capacity?
• How does the system respond to low or unstable input voltage?
• Is generator charging supported, and what generator capacity is required?
• Can a compatible solar charging option be added now or later?

Buying more batteries without confirming the available charging capacity can lead to incomplete charging, poor user experience and reduced battery life.

Where possible, choose a pure sine wave inverter for sensitive electronics and motor-driven appliances. Pure sine wave output is generally more suitable for televisions, audio systems, computers, refrigerators, fans and other equipment that may run noisily, heat up or perform poorly on unsuitable waveforms.

Always check the requirements of the appliances you plan to connect. Certain medical, laboratory or specialised devices may require additional technical assessment and should not be treated as ordinary household loads.

It is sensible to leave room for modest future needs, such as another fan, television or home-office device. However, buying a much larger inverter “for later” can also require a larger battery bank, heavier cables, more protection equipment and a different charging plan.

Tell your installer what you may add within the next one or two years. The system can then be designed with realistic headroom rather than guesswork.

Even a correctly sized inverter can underperform when it is poorly installed. Cable size, cable length, battery connections, ventilation, earthing, changeover arrangement, protective devices and installation location all matter.

Review the Hausstrom installation guide and use a qualified installer. Where required, suitable power distribution and protection products should be incorporated into the installation.

Batteries should be placed in an appropriate, ventilated location and kept away from flames, sparks, excessive heat and areas accessible to children. Follow all manufacturer instructions for the selected battery chemistry and system.

The purchase should not end when the inverter is delivered. Confirm the warranty terms, approved installation requirements, service availability and the process for getting technical support.

Buy through an authorised Hausstrom dealer or recognised sales channel, retain your proof of purchase and complete your warranty registration. Customers can also explore Hausstrom Secure for relevant product guidance and support services.

• Choosing only by kVA: always confirm the continuous watt output and surge capability.
• Ignoring simultaneous use: calculate appliances that will operate at the same time.
• Forgetting starting surge: motor-driven appliances may need much more power briefly at startup.
• Expecting batteries to increase inverter load capacity: more battery capacity generally supports longer runtime; it does not automatically increase the inverter’s maximum output.
• Buying batteries without a charging plan: the system must be able to recharge them properly within the available charging window.
• Adding high-heat appliances casually: kettles, irons, cookers and water heaters can change the required system size significantly.
• Using an unqualified installer: poor wiring and protection can affect safety, performance and warranty compliance.
• Overlooking after-sales support: choose a brand and channel that can provide product guidance, warranty support and technical assistance.

• List the appliances you must use during an outage.
• Record each appliance’s actual wattage.
• Calculate the load that will run simultaneously.
• Identify appliances with motors, compressors or high starting surge.
• Choose an inverter with verified continuous output, surge capacity and suitable headroom.
• Estimate the battery runtime you need.
• Confirm that the available charging source can recharge the proposed battery bank.
• Plan for modest future expansion.
• Use the correct cables, earthing, changeover and electrical protection.
• Confirm warranty, installation requirements and after-sales support before payment.