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ITGlossary · Batteries
OPzS / OPzV Tubular Battery
Stationary 2 V lead-acid cells with tubular positive plates, flooded (OPzS) or sealed with gel (OPzV), built for a very long life.
Technical level:Advanced
The letters come from German and describe a stationary battery with a tubular positive plate. The S stands for liquid electrolyte and the V for a sealed cell with gel electrolyte. Each cell has a voltage of 2 V and a capacity from a few hundred to several thousand Ah, and the cells are connected in series to form the battery string.
The tubular plate holds the active material firmly, so the battery withstands many deep cycles and long years on float charge. This is why it is used in telecoms, substations, large UPS systems and off-grid solar installations.
Plan the weight and space in advance: a battery string can weigh hundreds of kilograms or more and needs a suitable floor or stand.
Related terms
- Lithium-ion BatteryA rechargeable lithium-ion battery with high energy density, long life and faster charging than lead-acid batteries.
- Eurobat Design Life ClassesA classification of sealed lead-acid batteries by their design life on float charge at 20 °C.
- Flooded Lead-Acid BatteryA battery with liquid electrolyte and vent caps that needs regular checks and topping up with deionised water.
- GEL BatteryA sealed lead-acid battery with its electrolyte in gel form, well suited to deep and repeated discharges.
- VRLA BatteryA sealed, valve-regulated lead-acid battery that never needs topping up with water and is used in most UPS systems.
- AGM BatteryA sealed VRLA lead-acid battery whose electrolyte is absorbed in glass-fibre mat separators.