Support Articles
Troubleshooting Checklist: System Not Charging from PV or Grid
Step-by-step items to check, practical for solar/battery inverter energy storage systems.
1. Basic Power & Visual Checks
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AC grid power is present, voltage/frequency within normal range.
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PV array DC voltage is sufficient (no low voltage at sunrise/cloudy days).
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All breakers, PV DC switches, AC input switches are ON.
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No blown fuses, tripped residual current devices.
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No loose, burnt, or overheated wiring/terminals.
2. Inverter / Hybrid System Settings, especially the custom schedule correct.
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Confirm charging enable in custom schedule.
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Check time schedule / charging time slots are correctly set.
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Working mode correct.
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Grid charge function is enabled as well as the grid charge schedule enable (many systems let you disable grid charging separately).
3. Battery & BMS Status
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Battery voltage, temperature, and SOC are normal.
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BMS is not in protection mode: over-temperature, under-voltage, over-current.
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BMS communication to inverter is normal (no CAN offline fault).
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Battery not full; if already at max SOC, system will stop charging automatically.
4. PV Side Checks
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PV modules not shaded, dirty, or damaged.
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PV string polarity not reversed.
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Open-circuit voltage matches inverter input specification
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No faulty PV optimizer or micro-inverter causing string shutdown.
5. Grid Side Checks
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Grid voltage too high/low → inverter locks out charging.
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Grid frequency out of allowed range.
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Grid permission/anti-island protection active, blocking charging.
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CT current sensor installed correctly (reverse CT direction stops charging).
6. Communication & Wiring
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CAN wiring between inverter and battery correct.
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Terminal resistance correct (120Ω at bus ends).
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No loose communication wires causing intermittent offline.
7. Fault Codes & Logs
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Check inverter error logs: PV fault, grid fault, battery communication fault, over-temperature.
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If error codes exist, resolve the fault first — system will block charging until cleared.
Quick Summary
Check switches/fuses → system charging settings → battery BMS protection → PV/grid voltage limits → communication wiring → fault codes.
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