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Number of Panels

Panel count for a target plant capacity.

Design

Inputs (SI units)

Results

Modules required
10
Installed DC capacity
5.5 kWp
Module area (each)
2.62 m²
Total module area
26.2 m²

Save & Load Project

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Engineering Formula

  • N = ⌈P_plant × 1000 / P_module⌉
  • A_module = P_module / (η_mod × 1000) [m²]
  • A_total = N × A_module

Panels are always rounded up to hit the design kWp. Module area follows from STC irradiance of 1000 W/m² divided by efficiency.

Step-by-step Calculation

  1. 1.Raw countN = P×1000/Pm9.09
  2. 2.Rounded up⌈N⌉10
  3. 3.Module areaA = Pm/(η×1000)2.62 m²

Design Assumptions

  • • Uniform module rating across the array.
  • • STC irradiance 1000 W/m² at AM1.5, 25 °C cell.

Engineering Tips

  • ◆Use one SKU per MPPT for mismatch control.
  • ◆Reserve 2–3% spares for warranty replacement.

Warnings

  • ▲Mixing wattages on a string violates IEC 62548 mismatch limits.

Standards & References

IEC 61215IEC 62548IS 14286

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