When a battery’s voltage drops too low, the Battery Management System (BMS) will enter a protection mode to prevent damage. If your inverter lacks a battery wake-up function, or if the battery voltage is so low that the inverter cannot wake it up, you’ll need to employ specific methods to activate the battery. This document will guide you step-by-step on how to revive a battery with low voltage, ensuring it is safely brought back to operational status.

Required Equipment

To successfully revive a battery with low voltage, you will need the following equipment:

Adjustable Voltage Charger (0-60V): This is essential for carefully controlling the voltage and current supplied to the battery during the revival process. An adjustable charger allows you to start with a low voltage and gradually increase it, which is crucial for safely bringing a low-voltage battery back to life.

Amazon Germany: Laboratory Power Supply DC Adjustable Power Supply (60 V, 5 A)

Amazon USA: DC Power Supply Variable, 0-60V 0-5A

Step 1: Check Battery Power-On Capability

1. Press the ON/OFF Button: Begin by attempting to power on the battery. Press the ON/OFF button on the battery.

2. Observe Display and LED Indicators: Check if the display screen or any LED indicators light up. This will help you determine if the battery has enough charge to power on or if further action is needed. If the battery powers on, go to Step 2. If it doesn’t, go to Step 3.

Step 2: Check Battery Status

1. Establish Connection: Use the appropriate cable and software to connect the battery to a computer. This will allow you to access detailed information about the battery’s condition.

2. Analyze Battery Status: Review the battery status through the software interface.

3. If the status indicates a Fault and shows that the battery cannot be charged, go to Step 3.

4. If the status shows no Faults but indicates that the battery is in a protection mode and can be charged, go to Step 4.

Step 3: Charge the Battery by Outside Terminal

1. Set Initial Voltage: Configure the charger to a low initial voltage setting, typically slightly above battery’s current voltage. This cautious approach prevents damage during the initial charging phase.

2. Connect Charger to Battery: Securely connect the charger’s output to the battery terminals, ensuring correct polarity (positive to positive, negative to negative).

3. Begin Charging: Start the charging process at the initial low voltage. Monitor the battery closely for any signs of distress, such as excessive heat or unusual noises.

4. Incrementally Increase Voltage: Gradually increase the charger’s voltage setting in small increments.

5. Monitor Battery Response: As the battery charges, periodically check if the battery voltage goes up to 45V.

6. Turn to Inverter: When the battery voltage reaches 45V, stop charging. Now, connect the battery to the inverter and continue charging the battery to full using the inverter.