Solar EV Charging in Nigeria: Sizing, Batteries and the Cost Case
Plan solar charging around daily energy, inverter power, battery storage and real grid tariffs, with clear questions for your system designer.
Tochukwu Nkwocha
Founder
Solar can contribute to EV charging in Nigeria, but a useful design starts with the energy needed for your route and the hours the vehicle is parked near the solar system. The words “solar inverter” do not establish how much vehicle charging a system can support.
Every Sure Imports EV comes with a wall-mountable charger for Nigerian mains electricity. A solar installation must supply that charger correctly through suitable equipment. We have not confirmed that every supplied charger has automatic solar-surplus controls; a designer must verify the actual unit and proposed system.
Three different solar-charging arrangements
- Daytime charging: use available solar output while the vehicle is parked, with the building’s other loads included in the calculation.
- Solar plus grid: solar offsets part of demand and grid electricity supplies any permitted shortfall. The design determines how this behaves during an outage.
- Solar plus storage: a stationary battery stores energy for later charging. Its usable capacity, output limits and reserved energy for the building all matter.
A grid-connected solar system does not necessarily continue supplying the charger when grid power fails. Confirm backup operation explicitly with the system designer instead of inferring it from the presence of panels.
What documented systems show—and what they do not
Victron documents solar-surplus operation for its own EV Charging Station, integrated with supported equipment. That establishes that managed solar charging is technically available; it does not establish that the included Ruichi charger has those same controls or connectors.
Ask whether your proposed installation uses a fixed charging schedule, manually set power, or verified automatic control. If a supplier promises automatic surplus charging, request the supported equipment list and a demonstration of what happens when solar output falls or another major load starts.
Energy and power are separate sizing questions
Assume a route uses 20 kWh in the vehicle battery each day. At an assumed 90% charging efficiency, it needs about 22.22 kWh at the charging supply. The daily PV energy allocated to charging must cover that amount after the relevant upstream losses; do not apply the same loss allowance twice.
As a sizing illustration only, assume a site-specific design yield of 4 kWh per installed kWp per day at the usable AC output. Supplying 22.22 kWh would require about 5.56 kWp allocated to the vehicle on that assumed day, before adding other building demand and planning for poorer days. The 4 kWh/kWp figure is not a Nigeria-wide measured yield. Ask the designer for monthly estimates for your location, shading and array orientation, supported by a resource such as the World Bank-supported Global Solar Atlas and a site survey.
Daily energy alone is insufficient. The inverter must also sustain the charger and simultaneous loads. A system may produce enough total energy over a day while failing to provide the power required at the moment charging starts. This is why an installer needs the charger’s actual rating and control options.
Why a small home battery may not cover an overnight top-up
A stationary battery labelled 10 kWh cannot supply 22.22 kWh in one discharge. Usable capacity and conversion losses reduce what reaches the charger, while household backup reserves reduce what you can allocate to the vehicle. That arithmetic is independent of the brand printed on the battery.
If the vehicle is away all day, evaluate storage cost explicitly. If it is parked at the depot during productive solar hours, daytime charging may reduce the energy that must pass through storage. Neither arrangement is automatically best for every operating schedule.
Value solar electricity using an actual tariff sample
For customers covered by the A–Non-MD sample in NERC’s September 2026 IE Ogun tariff table, the published energy rate is ₦209.50/kWh. If solar genuinely displaces 25 kWh of otherwise purchased grid energy, its avoided energy charge is ₦5,237.50 for that day, or ₦136,175 over 26 such days, before separately applied billing charges.
This is avoided grid expenditure, not net profit or a solar-system quote. At the same order’s B–Non-MD rate of ₦62.48/kWh, 25 kWh displaces only ₦1,562 of energy charges. Your actual account rate and the alternative source being displaced strongly affect the economics.
Ask for a quote you can evaluate
- Installed price itemised into PV, inverter, storage, controls and installation.
- Monthly generation and usable charging-energy estimates, with assumptions.
- Written behaviour during grid failure and low solar output.
- Building-energy reserve and the vehicle’s charging priority.
- Warranty terms, service responsibility and replacement assumptions.
- A commissioning test with the actual supplied charger.
Calculate a lifetime energy cost using capital, maintenance and expected replacements divided by useful energy delivered, with financing and discounting where relevant. Do not call solar charging free or invent an installed-price payback period without a dated supplier quote. For the complete decision, compare it with generator charging and the EV-versus-fuel ownership budget.
