How Many Solar Panels Do I Need in Ghana?

Start with your daily energy consumption, then consider panel wattage, solar resource, system losses, battery requirements and inverter limits. A proper site assessment is recommended before installation.

Estimate array size from energy and sunshine

A useful first estimate is: PV kWp = daily kWh ÷ peak-sun hours ÷ 0.80 × (1 + PV safety margin). The 0.80 planning factor allows for ordinary system losses; the selected safety margin provides room for less favorable conditions. For example, a 10 kWh/day load at 5 peak-sun hours and a 25% margin gives about 3.2 kWp before checking the inverter.

Keep the PV array at least as large as the inverter rating

In the EliteVolt calculator, the energy-based PV estimate is rounded up and compared with the recommended inverter. If that PV estimate is lower, the displayed PV target is raised to the inverter rating so the suggested inverter never exceeds the suggested array in kWp. The two numbers therefore will not always be equal. Before installation, check the inverter's published PV voltage, current, power and string limits; a larger array must still be electrically compatible.

Panel count is based on usable panel watts

Once you have a kWp target, divide it by the panel rating in kW and round up. A 3.2 kWp target with 400 W panels (0.4 kW each) is eight panels as a simple nameplate estimate. Roof orientation, shading, cable runs, mounting space and the inverter's permitted string layout can change the practical design.

What to consider

• Daily kWh use and local peak-sun hours.
• PV safety margin and expected system losses.
• Panel wattage and the number of panels after rounding up.
• Roof shading, orientation and inverter PV string limits.

Get a system assessment

A site assessment and load analysis can produce a more reliable system design than using a generic panel or inverter count. Contact EliteVolt Systems for a project-specific assessment.