OPzS Batteries
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What are OPzS batteries?
OPzS batteries are stationary accumulators composed of 2 V cells with tubular plate technology and liquid electrolyte (open lead-acid). Their construction is optimized for deep cycle use, offering high robustness, long service life, and very stable performance in off-grid self-consumption installations and professional applications with daily consumption.
Key advantages of OPzS
- Very long service life: high cycle expectations in properly sized daily use.
- Deep cycle stability: excellent tolerance to repeated discharges.
- True modularity: custom configuration by connecting 2 V cells in series (12/24/48 V).
- Cost per cycle is very competitive in long-term projects.
Requirements and considerations
- Maintenance: periodic verification of electrolyte level and cleaning of terminals.
- Ventilation: as open lead-acid, they require a ventilated room and safety measures.
- Proper charging: adjust voltages and stages (absorption/float/equalization) in MPPT charge controllers and inverter chargers compatible with OPzS.
- Temperature: install indoors, avoid extreme temperatures to preserve service life.
Typical applications
- Off-grid homes with daily consumption and several days of autonomy.
- Small businesses and critical systems requiring continuous reliability.
- Telecommunications, signaling, and energy backup with high demands.
General specifications
| Format | Stationary 2 V cells (series 12/24/48 V) |
| Technology | Tubular plates, liquid electrolyte (open lead-acid) |
| Usage profile | Daily deep cycle, high durability |
| Maintenance | Required (electrolyte and terminals), ventilated room |
| Charging | Specific OPzS profiles; periodic equalization possible |
OPzS vs. TOPzS
- OPzS: classic reference among stationary batteries with maintenance and long service life.
- TOPzS: same tubular philosophy, design variants depending on manufacturer/model; check datasheets for maintenance and charging voltages.
Sizing tips
- Calculate the usable capacity (kWh) according to consumption and desired days of autonomy.
- Define the target depth of discharge (DoD) to maximize service life.
- Ensure cable sizes and protections are appropriate for the bank (fuses/DC breakers).
- Plan preventive maintenance and accessibility to the battery room.
If your priority is a robust stationary solution with a very long service life and outstanding deep cycle performance, OPzS batteries are a safe bet. For alternatives within the same tubular family, see TOPzS or return to the overview at Stationary Batteries.
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