Check These 5 Reasons Your Inverter Is Not Charging The Battery! (Troubleshooting Guide)

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Your appliances are connected to an inverter charger and everything is running smoothly, then one day the inverter stops charging the battery. What could have happened? Before you call for technical help, we have listed some common causes and how to fix them.
Check These Five Reasons Your Inverter is Not Charging the Battery!
Check These Five Reasons Your Inverter is Not Charging the Battery!
5 Common Inverter Charging Problems & Solutions
ProblemQuick Solution
No Battery Power SupplyCheck your main switch, circuit breakers, and ensure the power source (grid/generator) is active.
Dead or Worn-Out BatteryCheck battery lifespan. If old or failing to hold a charge after maintenance, it's time for a replacement.
Low Battery VoltageManually charge the battery with an AC charger or correctly sized solar panels to raise voltage above the inverter's minimum threshold (e.g., >11.5V for a 12V system).
Loose or Incorrect WiringTurn off the system. Check that all battery terminals are tight and clean. Ensure you are using the correct, thickest possible wire gauge.
Blown FuseIdentify the cause of the overload or short circuit first, then replace the fuse with the correct type as specified in the manual.
Inverter & Battery Sizing Guide
System SizeTypical Battery VoltageRecommended Battery Bank
1kVA System12V1 x 100Ah Lithium Battery
3.5kVA System24V1-2 x 100Ah Lithium Batteries
5kVA System48V2-4 x 100Ah Lithium Batteries
8kVA - 11kVA System48V4-8 x 100Ah Lithium Batteries
Appliance Power Consumption Guide
ApplianceTypical Wattage
Laptops & Chargers65 - 100 Watts
TV & DSTV Decoder150 - 200 Watts
Desktop Computer & Monitor200 Watts
Refrigerator (Medium)Running: 150W | Surge: 1800-2000W
Space Heater1500 Watts

Troubleshooting Inverter Charging Issues

If an inverter fails to charge a battery, the most likely reason is low voltage due to faulty wiring or a dead battery. If replacing the batteries and wires does not resolve the problem, the inverter's internal circuits might be damaged. Let's look at the possible reasons.

A Dead Battery

If your battery is dead, it can no longer hold a charge. Check its lifespan in the manual. If you have been using the same batteries for several years, it might be time for a replacement. If your battery has a long service history or has been repaired multiple times, consider getting a new one. Check if it's still under warranty before attempting any repairs yourself, as this could void it.

Low Battery Voltage

A typical 12V inverter charger requires the voltage to be above 11.5V to initiate a charge. A solution is to charge the battery with solar power from correctly sized solar panels, and once there is enough power, hook it back up to the inverter. Always use compatible batteries for your inverter's voltage (e.g., 12V batteries for a 12V system) to avoid damage.

Loose or Incorrect Wiring

Inverter cables must be the right size and securely fastened. A loose terminal will cause a system failure. The shorter and thicker the wires, the better. This reduces power loss and improves efficiency, so install the inverter as close to the battery bank as possible. This is a key part of any professional solar installation.

Blown Fuse

Fuses can blow due to a short circuit or if the inverter is overloaded. Before replacing a fuse, find the cause. If it was a short circuit, check all wiring to prevent a more serious issue. Always use the correct fuse type specified in the operating manual and contact a professional if you are unsure.

By following the tips in this guide, you should be able to diagnose and resolve most common inverter charging issues. For persistent problems, always consult a qualified technician from Sona Solar Zimbabwe.

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Sona Solar Zimbabwe

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