NAPCO Security Systems
GEM-P816 Installation Instructions
WI994A 10/99
Page 43
Use the procedure given below to determine the required standby battery capacity in Ampere-Hours (AH). NOTE: It is not
totally accurate to merely multiply the combined standby current (in amperes) by the standby time (in hours) to obtain the
battery capacity (in ampere-hours), since other factors (control-panel charging capabilities, temperature, battery condition,
etc.) affect battery operation. The following calculations will yield the theoretical minimum required capacity.
(1)
Backlighting disabled (cut Jumpers W1, W2 & W3).
(2)
Backlighting disabled (cut Jumpers A, B & C).
(3)
Standby Time in Hours.
1. STANDBY CURRENT
X
Amps
=
AH.
STANDBY CURRENT (Amps)
DEVICE
QTY
EACH
TOTAL
GEM-P816
1
X
0.120
=
GM-EZM816
X
0.050
=
GEM-RP1CAe2
X
0.100
=
GEM-RP1CAe2
(1)
X
0.035
=
GEM-RP2ASe2
X
0.065
=
GEM-RP2ASe2
(2)
X
0.020
=
X
=
X
=
X
=
TOTAL STANDBY CURRENT
Amps
(1)
Alarm current drawn in alarm.
(2)
Alarm Time in Hours. Example: For a 15 minute alarm timeout,
Alarm Time = 15/60 = 0.25.
2. ALARM CURRENT
ALARM CURRENT (Amps)
DEVICE
QTY
EACH
TOTAL
TOTAL STANDBY CURRENT
(from Box 1, above)
GEM-P816
(1)
X
0.100
=
0.100
BELLS
X
=
STROBES
X
=
HORNS / STROBES
X
=
X
=
X
=
TOTAL ALARM CURRENT
Amps
(Box 1)
(Standby Time)
(3)
(Box 2)
X
Amps
=
AH.
(Alarm Time)
(2)
(Box 3)
MINIMUM REQUIRED BATTERY CAPACITY = BOX 2 + BOX 3
AH.
Standby
-Batter
y
Cal
c
ul
ati
on Wor
ksheet