C - 1
Appendix C
Battery backup is a requirement for the
MXL. To determine the size battery
you must use, follow the procedures
listed below. The MXL can charge a
battery of up to 55 amp hours. A
battery size calculation form is also
provided.
1. Record all the modules required in
the form on the following page.
2. Calculate each row across and place
the total in the right column: Total
Standby 24 VDC Module Current
3. Total the right-hand column and
record it at the bottom of the form
opposite Total System Current.
4. For NFPA 72 Local, 72 Proprietary,
and UL 1076 systems multiply the
total system current by 24 and
record it at that Total AH location.
or
For NFPA 72 Municipal Tie and 72
Remote Station systems multiply
the total system current by 60 and
record it at that Total AH location.
or
For FM Approved Deluge/
PreAction systems multiply the total
MXL Battery Calculations
system current by 90 and record it at
that Total AH location.
5. Multiply the AH Total by 1.3 to
obtain the final battery amp hour
capacity and record it opposite
Battery Size.
Three battery models are UL listed for
use with the MXL:
BP-6124V, 15 AH
BTX-1a set of 12V, 31 AH
BTX-2a set of 12V, 55 AH
Select the battery that meets or
exceeds the final calculated battery
amp hour rating. Use an external
battery box with the BTX-2 model.
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