Specific Abilities 

The specific abilities of this type of battery for renewable energy applications are as follows. 

Cycling (one “cycle” consists of a discharge, of any depth, followed by a recharge) 

Overcharge ability 

Cycling in state of discharge 

Low rate of self-discharge 

No addition of water required during service life 

PowerSafe® OPzV are designed for applications where the battery must undergo repeated cycling with daily depths of discharge of up to 35% of capacity C120 (such as rural settlements, communications systems and lighting systems etc.)

Cell design 

The PowerSafe® OPzV cells consist of: 

Tubular positive plates with Lead-Calcium-Tin alloy, diecast to offer longer service life thanks to an extremely cohesive Lead-Calcium alloy grid 

Electrolyte immobilised as a gel 

Pressure Relief Valve - One way valve with integral flame arrestor 

Features & Benefits 

Excellent deep discharge recovery and cyclability 

Up to 5500 cycles to 20% depth of discharge, 1600 cycles to 60% DoD and 1200 cycles to 80% DoD 

Vertical or horizontal installation (see § 1.4 Commissioning (Installation & ventilation)) 

No topping up required 


Capacity is the number of Ah a battery can supply for a well-defined current and an end of discharge voltage. Capacity varies with the discharge time, discharge rate and temperature.

See data sheet for more info.

Discharge Rate: 

Is the ratio of discharge current divided by battery capacity 

Depth of Discharge (DOD): Capacity removed from the battery compared to total capacity. It is expressed as a percentage. The battery will be sized for solar applications with a DOD < 80% for the autonomy required. 

Daily cycle: The battery is normally used with a daily cycle as follows: Charge during the day hours and discharge during night hours. Typically daily use is between 2 to 20% DOD. 

Effect of Temperature 

On capacity: Correction factors of the capacity, according to the temperature are shown in the curve below. If the temperature is other than 25°C, the correction factors must be applied to the installation rating in order to secure an optimum service life. 

On the number of cycles: A rise in temperature brings about a decrease in the number of cycles (see below). 

For general operating instructions, please read the data sheet.

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