Chapter 4 Battery Care and Maintenance
Itron recommends you conduct open circuit voltage audits every six months on batteries
stored at or near 25°C (77°F). Recharge batteries when OCV readings approach 6 volts
(2.00 volts per cell). Increase OCV audits if storage temperatures are significantly higher
than 25°C (77°F)—even for short durations.
It is important to recognize the self-discharge rate of the battery is non-linear. The rate of
self-discharge changes as the battery's state of charge (SOC) changes. The time taken for
a battery to discharge from a 100% SOC to 90% SOC is different from the time it takes to
self-discharge from a 20% SOC to a 10% SOC.
State of Charge
The state of charge (SOC) of the battery can be approximated by using the curve shown in
the following chart. This curve is accurate to within 20% of the true SOC of the cell under
consideration, if it has not been charged or discharged within the past 24 hours. The curve
is accurate to within 5% if the cell has not seen any activity, charge or discharge, for the
past five days.
Charging the Battery
You can charge spare collector and repeater batteries individually, or in groups, to save
time.
54 TDC-0971-011 CCU 100 and Repeater 100 Installation Guide
Proprietary and Confidential
To Next Page
Loading...