Why 2 Solar Quotes for the Same Required Energy Consumption may Differ by Millions of Naira
Why Two Quotes for the Same Required Energy Consumption Can Differ by Millions of Naira
A homeowner in Lagos asks three installers for a quote on a 5kVA solar system for a three-bedroom flat. The first comes back at N3.5 million. The second at N5.5 million. The third somewhere in between. All three are quoting what appears to be the same system size. None of them is necessarily mispricing the system in the way the buyer assumes. The difference between those numbers shows how each installer interprets load, components, and risk.
Start with the battery, because it carries the largest share of both cost and variation. Battery storage is often the single largest cost component in residential solar systems, but it is also the least standardized. A system described as “5kWh” can be built using either tubular lead-acid batteries or lithium iron phosphate (LiFePO4) batteries. These are not interchangeable products even when labelled under the same capacity. Lithium systems carry a higher upfront cost but typically last longer and require less maintenance than tubular alternatives, which have shorter lifespans and more operational constraints. A quote built around lithium will always sit higher than one built around tubular, even when both are technically capable of powering the same household load.
The inverter introduces a second layer of variation. A 5kVA rating does not describe a single product category. Within that rating, there are differences in surge handling, efficiency, hybrid capability, and build quality. Some systems are designed strictly for current load requirements, while others are sized with headroom for expansion or high-surge appliances. That difference in design philosophy alone can shift total system cost significantly.
Solar panels add a third variable. Monocrystalline panels generally deliver higher efficiency and better performance under high-temperature conditions compared to polycrystalline panels, which still exist in the market as lower-cost alternatives. Over the life of a system, panel choice affects total energy yield, particularly in Nigeria’s high-heat environments where derating becomes a real constraint.
Layered on top of component selection is currency exposure and geopolitics. Because most solar components used in Nigeria are imported, system pricing is indirectly tied to exchange rate movements and change in policies at the point of procurement. A quote is therefore not only a reflection of technical design, but also of timing in relation to foreign exchange conditions and what new bill the exporting country feels like passing into law . This is one of the reasons two identical specifications can still produce different final prices within a short window.
Taken together, these factors explain why two installers can produce widely different quotes for what appears to be the same system. The variation is a reflection of differences in battery chemistry, inverter design choices, panel selection, and procurement timing. Each of those decisions carries cost implications that are not visible when the system is reduced to a single label like “5kVA.”
The practical consequence is that solar quotes are not directly comparable at face value. Meaningful comparison only begins when the underlying components are made explicit: what type of battery is being used, what class of inverter is being installed, and what panel specification is included. Without that breakdown, price becomes a poor proxy for value.
This is the gap the Kilostat is designed to narrow. Instead of asking households to interpret ambiguous kVA ratings, our Solar Sizing Calculator breaks system design into measurable inputs based on actual load requirements and standardised assumptions and we go a step further to provide a free consultation on your system requirements, its financial implication and the best funding options available in the market. The goal is not to determine whether a quote is expensive or cheap, but to make it clear what each quote is actually built to deliver.
Fabian Omini
Energy Analyst
Fabian Omini is an energy analyst with a keen interest in translating complex energy and finance topics into clear, accessible narratives for everyday Africans.
