Cellwatch Frontier System Installation & User Manual
Section II – User Guide-80
configuration. The option to set All Channels will set all ohmic channels available based on the
configuration.
Low Voltage: Alarm will occur when a cell voltage drops below the set value. This is useful to
ensure a proper charge voltage on a cell.
o Recommended 2.16V per cell
o Example: A 12V container would have a low voltage alarm limit of 13V
High Voltage: Alarm will occur when a cell voltage rises above the set value. This is useful to
ensure a proper charge voltage on the cell. Excessive voltage may lead to thermal runaway or
may indicate a weaker cell in the string.
Low Ohmic Value: Alarm will occur when a cell’s ohmic value drops below the set value. Low
ohmic value can indicate a possible short within the cell.
o Recommend 75% of baseline reading
High Ohmic Value: Alarm will occur when a cell’s ohmic value rises above the set value. High
ohmic value typically indicates that the cell is becoming more resistive and is losing capacity. A
boost charge on the individual cell may restore it to normal operation. Many factors can affect
ohmic value.
o Recommend 125% of baseline reading
Low Temperature Limit: Alarm will occur when the temperature on the cell terminal drops
below the set value. The standard operating temperature for a lead acid battery is 25°C (77°F).
Performance measured as a percentage of available capacity falls off rapidly as the temperature
is reduced. At 10°C (50°F), battery performance is down to 85% to 90% compared to that
available at 25°C.
High Temperature Limit: Alarm will occur when the temperature on the cell terminal rises
above the set value. The standard operating temperature for a lead acid battery is 25°C (77°F).
For every 8°C (15°F) increase in temperature, the battery can experience a 50% drop in life
expectancy.
Temperature Probe Alarms
This page contains options for setting string level temperature alarms. These alarm limits are applied to
any assigned temperature probes in the system, not including cell temperature measurements obtained
from DCM hardware. Different alarm limits can be applied to each configured temperature probe if
desired. The recommended ideal battery room temperature is 25°C or 77°F. Alarms are configurable in
Celsius only.
Label: Enter the desired label for the selected temperature probe. Ex. Ambient or Top Right.
Low Temperature: An alarm will occur when temperature reading falls below the low
temperature alarm limit.
High Temperature: An alarm will occur when temperature reading rises above the high
temperature alarm limit.
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