OPzS (Optimale Pflege zyklische Standby) batteries, also known as tubular flooded lead-acid batteries, are widely used in energy storage systems due to their long lifespan and high reliability. However, improper charging and discharging can significantly reduce their performance and lifespan. This article explores best practices for charging and discharging OPzS batteries to ensure optimal operation.
1. Optimal Charging Voltage and Current
To maintain the efficiency and longevity of OPzS batteries, it is essential to follow proper charging parameters:
- Float charge voltage: Typically set at 2.23V–2.27V per cell to maintain the battery at full charge without overcharging.
- Boost charge voltage: Usually in the range of 2.40V–2.45V per cell for deep discharge recovery.
- Equalization charge voltage: Around 2.50V per cell, applied periodically to balance cell voltage and prevent sulfation.
2. Avoiding Deep Discharges
Discharging an OPzS battery below 50% Depth of Discharge (DoD) regularly can shorten its lifespan. Ideally:
- Keep DoD within 30%–50% for longevity.
- Set a low voltage cutoff at 1.80V per cell to prevent excessive depletion.
3. Charge Efficiency and Time Considerations
Charging OPzS batteries should be done in three stages:
- Bulk charge: Supplies maximum current until voltage reaches the boost level.
- Absorption charge: Voltage is held at a constant level while the current gradually decreases.
- Float charge: Maintains full charge and compensates for self-discharge.
Using high-frequency chargers with temperature compensation ensures efficient charging and prevents overcharging, which can lead to water loss and grid corrosion.
