Frequently asked questions.

System size depends on two things: how much energy you use in a day (kWh) and how much power you draw at the same time (kW). Our online calculator gives a preliminary estimate from your appliance list. A final design is only produced after an engineer completes a load survey at your property, because actual usage patterns, appliance condition and cabling all affect the result.

kVA and kW describe power — how much load can run at one moment (inverter rating). kWh describes energy — how much electricity is used or stored over time (battery capacity and daily consumption). A 5 kVA inverter can run roughly 4 kW of load at once; a 10 kWh battery stores enough energy to run a 1 kW load for around 8–9 hours after allowing for usable capacity and losses.

Yes, when the system is designed for them. Inverter-type air conditioners are significantly more efficient than conventional units. Motors such as pumps and compressors draw a surge current at start-up, so the inverter must be sized for that surge. Very heavy loads such as electric cookers, water heaters and some industrial machines may be better served by the grid or generator, or by a larger engineered system.

Backup time equals usable battery energy divided by the load you run. For example, a 10 kWh lithium battery with about 8 kWh usable could run an 800 W average load for roughly 10 hours. Running more appliances shortens backup time. We always state the load assumption behind any backup figure — no system can guarantee uninterrupted power under every condition.

Lithium iron phosphate (LiFePO4) batteries cost more upfront but typically offer deeper usable capacity, many more charge cycles, faster charging and no routine maintenance. Lead-acid batteries are cheaper initially but have shorter lifespans and lower usable capacity. Over the life of a system, lithium usually provides a lower cost per kWh delivered. The right choice depends on budget, usage and space.

Often yes, if the inverter and battery system are compatible and the original design allowed for expansion. Mixing old and new batteries, or different brands, is generally not recommended. Tell us about future plans during your assessment so the design can accommodate them.

A hybrid inverter combines a solar charge controller, battery charger and inverter in one unit. It can draw on solar, battery, grid and generator supply and prioritise them according to settings — for example, using solar first, then battery, and grid or generator only when needed.

Three-phase systems are typically required where the building has a three-phase supply and significant three-phase loads such as large motors, lifts or industrial equipment. Many homes and small businesses operate on single phase. An engineer confirms this during the site assessment.

Yes, but output is lower. Panels generate electricity from daylight, not heat, so cloudy days reduce production rather than stopping it. A good design accounts for seasonal variation, and batteries, grid or generator supply cover shortfalls.

Most roofs can host panels, but orientation, shading, available area and structural condition all matter. Aluminium, long-span and concrete roofs are common in Nigeria and each requires an appropriate mounting system. Where the roof is unsuitable, ground or carport mounting may be an option.

Most residential systems are installed in one to three days after design approval and equipment delivery. SME systems commonly take several days, while commercial and industrial projects follow a project schedule agreed during design.

An engineer inspects your distribution board, wiring, earthing, roof or mounting area and existing generator or grid connection, and reviews which loads you want to support. This information produces a final system design and a formal quotation.

Cost depends mainly on inverter capacity, solar array size, battery storage and installation complexity, and is affected by exchange rates and equipment availability. Our calculators show an indicative range based on our current unit rates and published assumptions. A formal quotation is provided after a site assessment.

Low quotes often reflect undersized batteries, unbranded or refurbished components, missing protection devices (fuses, surge protection, isolators, earthing), or minimal installation workmanship. Compare quotes on usable battery capacity, equipment specifications, protection scope, warranty terms and after-sales support — not just headline price.

Yes. MBB FlexiPower lets you pay a 40% deposit and spread the balance over 3, 6, 9 or 12 monthly payments. Our financing calculator shows illustrative repayments at an example 18% annual reducing-balance rate; your actual terms are confirmed in writing before installation. Bank and partner financing is not currently available.

For MBB FlexiPower we ask for valid identification, proof of address, proof of income or six months’ bank statements (CAC documents and business statements for companies), and a formal MBB quotation following a site assessment.

Solar systems need relatively little maintenance. Panels benefit from periodic cleaning, especially in dusty Harmattan months. Connections, protection devices and battery health should be inspected periodically by a qualified technician. Lithium batteries do not need water top-ups.

Yes. Essential Care (₦75,000 per year) covers an annual inspection and cleaning; Premium Care (₦150,000 per year) adds a second visit, proactive monitoring and priority response; Commercial Care (from ₦350,000 per year) provides quarterly maintenance and performance reporting for commercial and industrial systems.

Equipment warranties are provided by manufacturers and vary by product — panels often carry separate product and performance warranties, while inverters and batteries have their own terms. Installers usually provide a separate workmanship warranty. MBB Energy systems carry: solar panels 12 years product and 25 years performance; inverters 5 years; lithium batteries 5 years; and a 2-year MBB workmanship warranty. We register manufacturer warranties at handover and manage claims for you.

Yes. Hybrid systems integrate solar, batteries, grid and generator supply. The system can charge batteries from the grid when available and start the generator only when necessary, reducing runtime and fuel costs. Generator integration requires correct changeover design to protect equipment.

Net metering is not generally available to residential customers in Nigeria at present. Systems are therefore designed to use solar energy on-site and store surplus in batteries. Check with your distribution company for any current schemes.