Cycle life

(1). GB / T19064-2003) solar photovoltaic power system technical conditions and test methods

    Suitable for photovoltaic systems using the type of batteries including deep cycle lead-acid batteries, sealed lead-acid batteries, ordinary open lead-acid batteries and alkaline nickel-cadmium batteries. The design discharge depth (DOD) of the deep cycle lead-acid battery is 80%, and the design discharge depth (DOD) of the shallow cycle lead-acid battery is 50%. At 25 ° C, the cycle life of a shallow cycle battery must exceed 200 (mean discharge depth 50%) and the cycle life of a deep cycle battery must exceed 600 (average discharge depth 80%).
    Because of the technical conditions and test methods of solar photovoltaic power system (GB / T19064-2003) is applicable to domestic solar photovoltaic power system, so the operating temperature of the battery and the use of the controller should be the same: the normal conditions of use Ambient temperature: 5 ℃ ~ +40 ℃; Relative humidity: ≤ 93%, no condensation;? Altitude: ≤ 1 000m;
(GB / T19064-2003) also stipulates: When the sealed lead-acid battery at an altitude of 2500m above the conditions of use, must be battery manufacturers to confirm that the battery is suitable for use in such conditions.

(2). The latest national standards: GB / T 22473-2008 storage of lead-acid batteries

     Basic equivalent IEC 61427: 2005, "Batteries and accumulators for solar photovoltaic energy systems: General requirements and test methods":
     Scope of application: solar power and wind power generators and other renewable energy sources 2V, 6V, 12V energy storage with lead-acid batteries. Including lead-acid batteries for exhaust energy storage; VRLA batteries for VRLA.
     Battery operating environment: the battery must be able to -30 ℃ ~ 50 ℃, less than 90% humidity, the highest altitude of 4,500 meters in the environment smooth operation. But the assessment of lead-acid storage battery low-temperature performance is -10 ℃ should be released under the rated capacity of more than 80%.

Cycle Durability Test (Cycle Life):

    The fully charged battery placed in the ambient temperature of 40 ℃ ± 3 ℃ environment to maintain 16h, and then test the entire test process to maintain the battery around the temperature between 40 ℃ ± 3 ℃.
    The first stage (low charge, shallow cycle) to I10 (A) current discharge 9h (battery voltage below 1.75V, stop the discharge);
    (A) current charge for 3h, discharge current at I10 (A) for 3h, press charge and discharge for 49 times, then fully charge, and enter the second stage.
    The second stage (high charge, shallow cycle) to 1.25I10 (A) current discharge 2h; to I10 (A) current charge 6h (limit charge voltage 2.4V / monomer), then charge and discharge 99 times fully charged, The third phase.
    The third stage (10h rate capacity check discharge) battery from the first stage and second stage test cycle 150 times a cycle, and then at room temperature for 10h rate discharge current to 1.8V, if the capacity is greater than 80% of the rated capacity into the next One cycle test, otherwise the cycle endurance test is terminated.
    The national standard GB / T 22473-2008 "storage of lead-acid batteries" provides: valve-regulated battery cycle 3 times (450 times), exhaust-type battery cycle 4 times (600 times) qualified.
    National standard GB / T 22473-2008 also provides for energy storage lead-acid battery charge acceptance and water loss and other technical standards.