Honeywell MRP-2001E Benutzerhandbuch

Power Supply Calculations

102

MRP-2001 & MRP-2001E   PN 53040:A  4/16/2007

Use Table 5-4  to calculate the total Standby and Alarm load in ampere hours (AH).  This total load 
determines the battery size (in AH), required to support the control panel under the loss of AC 
power.  Complete Table 5-4  as follows:

1. Enter the totals from Table 5-3 on page 101, Calculation Columns 2 and 3 where shown

2. Enter the NFPA Standby and Alarm times (refer to ‘NFPA Requirements’ below)

3. Calculate the ampere hours for Standby and Alarm, then sum the Standby and Alarm 

ampere hours

4. Multiply the sum by the derating factor of 1.2 to calculate the proper battery size (in AH)

5. Write the ampere hour requirements on the Protected Premises label located inside the cabi-

net door 

NFPA 72 Local, Central and Proprietary Fire Alarm Systems require 24 hours of standby power 
followed by 5 minutes in alarm

Select batteries that meet or exceed the total ampere hours calculated in Table 5-4 .  The control 
panel can charge batteries in the 7 AH to 26 AH range.  The control panel cabinet is capable of 
housing batteries up to 18 AH.  Batteries larger than 18 AH require the BB-26, BB-55 or other UL 
listed external battery cabinet.