The ohmic wiring resistance induces losses both in DC – between the modules and the inverter – and AC – between the inverter and the step-up transformer.
The wire gauge (AWG) should be selected for an ohmic loss of 1.5% or less.

The formula to calculate the current are:

DC side : I = P / U or I = U / R

Where:
I: Current in Amp
U: Voltage in Volt
P: Power in Watt
R: Wire resistance in Ohm

AC side: I= P / (√3  U cos φ) or I=U / (R cos φ)

Where:
I: Current in Amp
U: Voltage in Volt (Line-to-Line)
P: Power in Watt
R: Wire resistance in Ohm
cos φ: Power factor


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Other performance factors

  1. GHI to POA ratio
  2. Far shading
  3. Inter-shading
  4. IAM
  5. Soiling
  6. Snow
  7. Low irradiance
  8. Temperature
  9. Module quality
  10. Mismatch
  11. Inverter efficiency
  12. Power clipping
  13. Wiring
  14. Transformer
  15. Dispatch
  16. PID
  17. Light soaking
  18. Aging