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  5. Solar PV Diagnosis & Repair

Solar PV Diagnosis & Repair

Solar array and system faults — yield, strings, shading, soiling and the difference between a real fault and an expectation set against nameplate. Written to establish what output SHOULD be for the conditions first, because without that reference "underperforming" is an opinion rather than a measurement.

Underperformance and yieldloss1 guideSoiling, shading andvegetation1 guideString faults, fuses andconnectors1 guideModule degradation andbypass…1 guideInverter clipping andexport…1 guideDC bus and isolationfaults1 guideCharge controllers andbattery…1 guideSolar PV
Fault domains for Solar PV. Solid outline means a published guide covers that domain; dashed means the guide is not yet written. 7 of 7 covered.

What this covers

  • ▪Underperformance and yield loss — Solar System Producing Less Than Expected
  • ▪Soiling, shading and vegetation — Solar System Producing Less Than Expected
  • ▪String faults, fuses and connectors — Solar String Faults
  • ▪Module degradation and bypass diodes — Module Degradation and Bypass Diode Failure
  • ▪Inverter clipping and export limitation — Solar System Producing Less Than Expected
  • ▪DC bus and isolation faults — Solar Inverter DC Bus Fault
  • ▪Charge controllers and battery charging — Solar Charge Controller Not Charging the Battery

Diagnosis guides

  • Solar System Producing Less Than Expected — Diagnosis

    Grid-tied, hybrid and off-grid PV systems, roof and ground mounted, single- and three-phase

    9 diagnostic steps · intermediate · qualified electrician

  • Solar Charge Controller Not Charging the Battery

    PWM and MPPT charge controllers in off-grid and hybrid systems, lead-acid and lithium banks

    8 diagnostic steps · intermediate · qualified electrician

  • Solar String Faults — Fuses, Connectors and the Dead String

    Grid-tied, hybrid and off-grid PV arrays, roof and ground mounted, single and multiple MPPT inputs, with or without string combiner boxes

    8 diagnostic steps · intermediate · qualified electrician

  • Module Degradation and Bypass Diode Failure — Finding the Weak Panel

    Crystalline silicon modules in grid-tied, hybrid and off-grid arrays, roof and ground mounted, any age

    8 diagnostic steps · intermediate · qualified electrician

Related guides

Filed under another category, but they cover part of the scope above.

  • Solar Inverter DC Bus Fault — Over-Voltage, Under-Voltage and Isolation

    in Inverter Repair & Troubleshooting · 8 diagnostic steps

Want us to do the work?

These guides are written so you can diagnose the fault yourself. If you would rather an engineer handled it, our mobile workshop covers all 47 counties.

Solar PV Diagnosis & Repair servicesTalk to an engineer

Related categories

  • Inverter Repair & Troubleshooting
  • UPS Repair & Troubleshooting
  • Pump Diagnosis & Repair
  • Industrial Electronics & Drives