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)
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.)
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.
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.