User Manual

Gateway - QSG

Sealed Lead-Acid Backup Battery

The Gateway is designed to continue operating during power

outages. A 6v 4.5AH sealed lead-acid (SLA) battery (7)

provides full power for 12-24 hours during power outages.

Blackouts longer than this are very rare in the United States.

The Gateway automatically charges and conditions the SLA

battery whenever external power is present using an

intelligent switching charger that adjusts charging voltage

according to ambient temperature; this is essential for long

service life in outdoor applications. The charger also

automatically detects battery faults such as failure to charge

or internal short circuits and stops charging the battery.

Although SLA batteries do not normally vent, in the event of a

catastrophic failure, if venting occurs, the Gateway includes a

Gore-Tex vent that prevents gas pressure from building

within the Gateway chassis while maintaining a tight seal

against liquid water.

The Gateway monitors the SLA voltage

and status and displays them on the LED

status panel. When the SLA is fully

charged, the 4 green SLA LEDs will be

illuminated. When the SLA is charging,

the LEDs will walk from left to right

indicating charging; when the SLA is

discharging, the LEDs will indicate the remaining capacity of the battery; when

no LEDs are lit, the battery is fully discharged. Any error conditions such as a

missing or failed battery will result in the red SLA LED being illuminated. More

detailed information can be found using the System Manager graphical user

interface software including the battery installation date, current voltage,

number of full battery cycles, and the nature

of any failure.

The SLA battery connector is keyed to

prevent reverse insertion and locks in place

to prevent disconnection due to vibration.

The Gateway is also protected against

battery reverse-polarity if the wiring harness is installed

incorrectly on a new battery. If a reverse polarity battery is

installed, it is automatically disconnected electrically by the

Gateway and a red polarity LED next to the battery connector illuminates.

SLA batteries have a typical service life of 4-5 years; service life is affected by factors including

number of charge/discharge cycles, ambient temperature, and usage patterns. The Gateway

protects the SLA against damage from deep discharge by automatically disconnecting the battery

when it discharges to 5.5vdc. The Gateway also automatically tracks the SLA battery installation

date and number of charge/discharge cycles to aid in battery maintenance.

SLA batteries can supply power for the Gateway from -20C to +65C; recommended replacement

batteries include: GH Prism GH645 and Powersonic PS640 F1.