Common Solar Inverter Problems (Pakistan) — Troubleshooting Guide
This page covers the most searched solar inverter problems in Pakistan with quick checks, probable causes, and fixes. For calculations, use our Panel Count, Net-Metering, and Inverter ROI tools.
Common Inverter Problems
Most frequently encountered solar inverter issues in Pakistan and their solutions
Grid voltage out of range (high/low)
Symptoms: Error messages like 'Grid Over/Undervoltage', 'VAC out of range', 'Error 102' (brand dependent).
- Measure AC at inverter terminals
- Confirm country/grid profile
- Tighten AC breakers/neutral/earthing
- Verify cable size for run length
- Ask DISCO to correct tap settings if consistently high
- Consider a suitably rated stabilizer for sensitive loads
Low solar output at noon
When your system isn't producing expected power during peak sun hours.
- Compare expected vs actual: PSH × kWp × PR
- Use the Panel Count tool
- Inspect for dust/shading
- Check MPPT voltage window
- Verify strings are balanced
- Clean panels and re-test on a clear day
Net meter shows zero export
When your net meter isn't recording exported energy to the grid.
- Net metering approval in place
- Export limit not set to 0%
- CT polarity correct
- Day-time grid present
- Meter programmed for bidirectional energy
- Cross-check with Net-Metering tool
Battery not charging
When your hybrid or off-grid system's batteries aren't charging properly.
- Battery chemistry profile
- BMS comms (CAN/RS485)
- Charge current/voltage limits
- PV array voltage > MPPT min
- Blown fuses/isolator
- Firmware up to date
Inverter trips/shuts down at night
When your inverter unexpectedly turns off during nighttime hours.
- Backup mode thresholds
- Battery SOC cutoff
- Surge loads at night
- Grid outages
- For grid-tie only, shutdown at night is normal
Error codes (brand-specific)
When your inverter displays specific error codes that need interpretation.
- Enphase
- Fronius
- GoodWe
- Solis
- Growatt
- (Create these pages as you publish)
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