Measurement Computing DBK34A - Manual (Page 4)

Indicators
Three front-panel LED indicators provide power and charging status information.
LED Indicators & Descriptions
MAIN POWER Lights when the DBK34A power input is connected to a source of at least 12.25 VDC
CHARGING Lights when the internal batteries are being fast-charged at a rate of 0.1 amp/cell or greater.
DISCHARGING Lights when internal batteries (or auxiliary batteries) are discharging at a rate of 0.25A or greater.
Runtime
For trouble-free operation, you must fully charge the batteries before use.
Charged battery runtime depends on the load and on the mode of operation.
Approximate runtime under various loads can be computed from the storage capacity (5 A-hr in 12 V
mode; 2.5 A-hr in 24 V mode) and the load (main unit and other DBKs). See Power Requirements in the
DBK Basics section.
The following Load Wattage vs. Hours graph is for a typical new battery that is fully charged.
Charging
In general, lead-acid batteries [and related Gel-Packs] require charging at 120% of drain energy (e.g.,
the 5 A-hr DBK34A requires a charge equal to or greater than 6 A-hr). Charging times vary; but
4 to 5 hours at 14 V is typical for a completely discharged battery; after which, charging may continue
indefinitely.
Note that 16 to 18 VDC at the power input is required for optimal charging.
CAUTION
Voltage applied to a DBK34A must not exceed 30 VDC.
DBK34A, pg. 4 879795 DBK Option Cards and Modules