If your solar panels are generating power but your batteries aren’t charging, it’s usually due to system settings, battery status, or hardware configuration. In many cases, the system is working correctly but prioritizing supplying power to loads—or the batteries may already be full.
Possible Causes
-
Battery Full – If your battery’s State of Charge (SOC) is at 100%, it will stop accepting more charge.
-
Inverter or Charger Settings – Some hybrid inverters are programmed to charge batteries only during certain conditions (e.g., grid outage, off-peak hours).
-
Battery Protection Mode – The Battery Management System (BMS) may prevent charging due to temperature, voltage imbalance, or internal safety protocols.
-
PV Production Priority – Your system may be configured to power loads first and only charge batteries with any remaining power. If all solar power is going to your loads, there may be none left for charging.
-
Voltage Mismatch or Communication Loss – Incompatible voltage settings or a lost connection between the inverter and battery can block charging.
What to Check
-
Battery SOC on your inverter screen or monitoring app.
-
PV input vs. load demand—are loads consuming all available power?
-
Inverter/charger settings, including charging mode and time-of-use schedules.
-
Any active alarms or fault codes on your inverter or BMS.
Tip:
To troubleshoot, try disconnecting all loads while ensuring full sunlight on your solar panels. If the battery still doesn’t charge, this may indicate an issue in the charging circuit or system settings.
💡 Still have questions? Call us at 1-888-421-5354 or email hello@solarpowerstore.ca. To submit a support request, please use the form located below this article. If you'd like to speak with our team directly, you can also book a meeting here.