What are the battery requirements and backup power calculations for the MXL?

Siemens MXLMar 23, 202682 views

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The MXL-IQ can charge batteries with a capacity of up to 55 amp hours (AH) (Page 127) [1].

Listed battery models include the BP-61 (15 AH), BTX-1 (31 AH), and BTX-2 (55 AH); the BTX-2 requires an external battery box (Page 15, 127) [1].

For the System CXL, backup power is provided by a separate Uninterruptible Power System (UPS) (Page 5) [1].

Battery Calculation Procedure

To determine the required battery size for an MXL-IQ, follow these steps (Page 127) [1]:

Total Standby Current: Sum the 24 VDC standby current for all modules in the system.
Determine Standby Hours: Multiply the total system current by the required hours based on the system type:**

24 Hours: NFPA 72 Local, Proprietary, and UL 1076.
60 Hours: NFPA 72 Municipal Tie and Remote Station.
90 Hours: FM Approved Deluge/PreAction.

Apply Reserve Factor: Multiply the calculated AH total by 1.3 to obtain the final required battery amp hour capacity.
Select Battery: Choose a battery model that meets or exceeds the final calculated rating, ensuring it does not exceed the 55 AH charging limit (Page 127, 130) [1].

1siemensMXL-IQInstallationp. 127, 130, 15, 18, 3, 35Open

AI-generated — verify against your panel's documentation and applicable codes (NFPA 72, local AHJ).

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