Solar System Troubleshooting Guide

Understanding the basic functions and settings of your solar power system is essential for reliable performance—especially during load shedding.

Solar System Troubleshooting:

Reserve & Grid Charge Your Battery

To ensure you have battery backup for load shedding

Overview

Correct battery charge and discharge settings are critical during extended load shedding periods. By reserving battery capacity and enabling grid charging when needed, you can ensure backup power is available when it matters most.

Reserving Your Battery for Load Shedding

  1. Tap the cog icon (top right)

  2. Select System Work Mode

  3. Choose the relevant time slot

  4. Select the Batt field for that slot

  5. Adjust the reserved battery percentage

  6. Save using the tick icon

Enable Grid Charging

  1. Tap the cog icon

  2. Select Battery Setting

  3. Enable Grid Charge

  4. Save your settings

Low PV Production

What you’ll see

  • PV power lower than expected

  • No error codes

Most common causes

  • Shading (even partial)
  • Dirty panels
  • Incorrect tilt or orientation
  • MPPT misconfiguration
  • Grid export limit active

Quick checks (start here)

  • Inspect for shading at current time
  • Clean panels if visibly dirty
  • Confirm correct MPPT configuration
  • Check export limitation settings

One String Producing Less Than Others

What you’ll see

  • MPPT1 normal, MPPT2 low
  • String currents mismatch

Most common causes

  • Panel mismatch
  • Partial shading
  • Faulty panel
  • Loose MC4 connector

Quick checks (start here)

  • Measure string current and voltage
  • Swap strings between MPPTs
  • Inspect connectors and junction boxes

PV Voltage Too High / Too Low

What you’ll see

  • PV fault or inverter won’t start

  • Fault occurs early morning or cold days

Most common causes

  • Too many panels in series

  • Cold VOC exceeding inverter limit

  • Incorrect panel datasheet used

Quick checks (start here)

  • Calculate cold VOC

  • Compare with inverter max DC voltage

  • Confirm series panel count

PV Detected but Battery Not Charging

What you’ll see

  • PV power visible
  • Battery idle

Most common causes

  • Battery full
  • Charging disabled
  • Grid or load priority override
  • BMS charge limit active

Quick checks (start here)

  • Check battery SOC
  • Confirm charging enabled
  • Review inverter priority settings

Inverter Trips When PV Starts

What you’ll see

  • Inverter restarts when sun increases

  • PV fault or DC fault

Most common causes

  • Earth leakage

  • Insulation resistance too low

  • DC surge damage

  • Incorrect earthing

Quick checks (start here)

  • Perform insulation resistance test

  • Check DC surge arrestors

  • Inspect cable routing

PV Production Drops Intermittently

What you’ll see

  • PV fluctuates without clouds
  • Random drop-outs

Most common causes

  • Loose MC4 connectors
  • Overheating panels
  • MPPT current limit reached

Quick checks (start here)

  • Inspect all connectors
  • Check panel temperature
  • Review inverter logs

Common Installer Mistakes

  • Exceeding cold VOC limits

  • Mixing panel models in same string

  • Incorrect MC4 crimp tools

  • Running DC and AC cables together

  • Connecting unequal string lengths to same MPPT

Related Resources

Panel Datasheets

Fault Codes

Installation Guides