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6. Discharge Rate

The discharge rate of the battery in Amps are is calculated in I10.

I10 = current for 10hr discharge to 100% DOD. This will be the basis 
for all discharge rates across this brochure. For example:

Let’s take the Eternity OPZV 10 OPzV 1000 
C10 capacity = 1185Ah to an end of discharge voltage of 1.80V @ 
20°C
1 x I10 = 1 x (10hr discharge)
1 x I10 = 1 x 118.5 = 118.5A
5 x I10 = 5 x 118.5 = 592.5A

End of Discharge Voltage

Discharging too much capacity from the battery will lead to early 
failure so the user must ensure that measures are in place to prevent 
this. The recommended low voltage disconnect settings are 
mentioned below:

g) IUI Charging Profile

The IUI charging method is perceived as the best method of charging 
for a lead acid batteries and will increase the cycle life of the cell. The 
charging method is similar to the above but an additional constant 
current phase is added after the Constant voltage phase. The final 
constant current phase equalises the charge over the individual cells 
to ensure even finishing. This will help improve the battery efficiency 
and ultimately increase the cycle life.

Bulk Charge / Phase 1 
The charging current is set to a limit between 2-5 x I10 until it reaches 
a maximum voltage of 2.35V / cell.

Constant Voltage / Phase 2
Here the voltage is set to 2.35V / cell. During this phase the absorbed 
current will start to decrease and finally reach a value of 0.005A / Ah. 
At this point the battery is considered fully charged and the rectifier / 
charger system should be switched back to the relevant float voltage. 
The constant Voltage phase of the charge should be limited to a 
maximum of 10hrs with maximum current of <1.2A/100Ah.

I Phase / Phase 3
No voltage limits, but maximum current of <1.2A/100Ah for a duration 
of maximum 4 hours. 

The float voltage value requires a thermal compensation of -3.5mV/
cell/°C for temperature increases. For temperature decreases in the 
cell the voltage should be increased by 3.5mV/Cell/°C. See graph 
below. Failure to change these values will lead to capacity problems 
and reduction in operational life. 

c) Equalizing / Boost charge 2.35 – 2.4V

Chargers usually have two adjustable charging voltages: one for the 
“floating” charge and one for the “equalizing” charge (also known as 
“boost”, “high rate” or “recharge”).

The equalizing charge is generally required:

-  when the total voltage spread between the cells is greater than 0.04 
V under float charging conditions
-  after exhaustive discharges
-  for fast recharging after a discharge
-  when charging cells in standby applications with frequent power 
outages
-  for float charge using voltages below 2.23 Vpc 

Boost charge voltage is 2.35 – 2.4V per cells for a maximum duration 
of 48 hours. It can be turned off earlier though if the current has 
decreased to a value lower than  0.05 x I10.

d) Charge current limit

The limit for the charging current using the float charge voltage after a 
discharge is limited to 5 x I10

e) Charging Time

Use the graph below for to estimate typical charging times:

f) IU Charging Profile

The IU charge is the most common method for fast recharging or 
when batteries are charged in cyclic applications. It consists of two 
phases:

Bulk Charge / Phase 1
The charging current is set to a limit between 2-5 x I10 until it reaches 
a maximum voltage of 2.35V / cell.

Constant Voltage / Phase 2
Here the voltage is set to 2.35V / cell. During this phase the absorbed 
current will start to decrease and finally reach a value of 0.05A / Ah. 
At this point the battery is considered fully charged and the rectifier / 
charger system should be switched back to the relevant float voltage. 
The constant Voltage phase of the charge should be limited to a 
maximum of 10hrs with maximum current of 5A/100Ah.

Back up time (h)

U (V) per cell 

0,5-1,5 

1,70

1,5-3

1,75

>3-24

1,80

24-240

1,85

Содержание OPzV Series

Страница 1: ...dby Solar Batteries are designed to be used as back up power to support users that need reliable service continuity in case of power blackouts and outages of the electricity distribution network They can also be used in off grid and hybrid installations Installation Operation and Maintenance Solar Batteries ET IOM005 0520 ...

Страница 2: ...nel Observe the following precautions at all times Observe the operating instructions work on the battery should be carried out by qualified personnel only Exposed metal parts of the battery carry a voltage and are electrically live with the risk of short circuits Avoid any electrostatic charge before starting work on the battery first discharge any possible electricity from yourself by touching a...

Страница 3: ... and performance 3 Delivery Unpacking and storage Unpack the batteries as soon as they are delivered Verify that the equipment has been delivered in good condition Any damage must be reported immediately to the carrier and the damaged items retained for inspection by the carrier s representative The details on the label should be read carefully and the following points to be observed Cell Type Cel...

Страница 4: ...ernity Technologies When storing horizontally ensure that the internal plates are vertical to check this is the correct the positive and negative terminals should be above or below each other ie not on the same level as per the diagram below 5 Charging a Commissioning Charge Batteries lose charge while in transit or during storage For this reason a refresh charge should be given before putting the...

Страница 5: ...age value requires a thermal compensation of 3 5mV cell C for temperature increases For temperature decreases in the cell the voltage should be increased by 3 5mV Cell C See graph below Failure to change these values will lead to capacity problems and reduction in operational life c Equalizing Boost charge 2 35 2 4V Chargers usually have two adjustable charging voltages one for the floating charge...

Страница 6: ...ifferent number of cycles 9 Hybrid Applications Eternity Technologies Solar OPzV batteries can be used in a hybrid system alongside a diesel generator where the batteries are used to decrease the run time of the generator Charging is critical in this application and the user must ensure that the charging time is sufficient to fully charge the battery between cycles Failure to do this will result i...

Страница 7: ...l battery float voltage the voltage on pilot cells and temperature Once a year Check and record individual cell voltages Perform a discharge test according to IEC 60896 21 standard until the battery shows signs of degradation and then every six months thereafter Keep a log book to record all maintenance and inspection operations which will be helpful to monitor long term changes of the battery con...

Страница 8: ...tytechnologies com The Eternity Technologies range is built using only the highest quality and most efficient production processes at our state of the art manufacturing centre in the UAE It is this innovation modern design criteria and industry leading machinery that allows Eternity Technologies to not only meet the needs of the global industrial market with increased reliability but define it for...

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