Step 1: Inspect & Clean the Battery
✅ Check for cracks, bulges, or leaks—replace damaged batteries immediately.
✅ Ensure waterproof seals (rubber gaskets) are intact to block rain/dust.
✅ Wipe away moisture with a dry cloth; use alcohol to clean oxidized electrode contacts (improves conductivity).
Step 2: Test Voltage & Balance Cells (Crucial!)1
🔌 Use a multimeter or BMS to measure each cell’s voltage:
LiFePO₄ cells: Normal = 3.2V; ideal storage voltage = 3.0 -3.3V.
If a cell is < 2.5V (deep discharge) or cells vary by > 0.1V:
👉 Charge slowly with your PV system’s repair mode (1C rate max) until voltages stabilize (3.0V+ per cell).
Take a Deye 12kW hybrid inverter as an example:
- Click the screen and select Lithium Battery on the Battery Setting page; choose the correct battery capacity/ Max A Charge/ Max A Discharge. They tell Deye hybrid inverter to know your battery bank size.
- Click the next step and choose the charging method you need:
🔋Grid charge: utilize grid to charge the battery in a time period.
🔋Gen charge: utilize diesel generator to charge the battery in a time period.
🔋System charge: On the System Work Mode page, click the BattFirst option. Then, PV power will firstly used to charge the battery and then used to power the load.
👉 For very low voltage (can’t start the system), pre-charge with a dedicated lithium charger first.
Step 3: Safely Reconnect to Your PV System
Turn off all power sources (solar panels, grid, load), ensure the battery’s total voltage matches the requirements of your PV system.
Safety & Quick Tips
❗ Avoid high currents or generic chargers—they damage cells.
❗ Replace gaskets if cracked to prevent water damage.
💡 A well-balanced battery lasts 20% longer!
DM us to learn more battery information!