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

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.