To choose the type and number of batteries needed for 24 hours of standby power based on the Amp Hours Required calculation, perform the following:
- Select the desired standby hours required from the table below: 24 hours.
- Select the desired battery size: Model 368 (12 VDC 5.0 Ah), Model 369 (12 VDC 7 Ah), Model 365 (12 VDC 9 Ah), Model 366 (12 VDC 18 Ah).
- Select a Max. Ah Available number that is just greater than the number calculated in Amp Hours Required.
- Install the number of batteries shown in the corresponding No. of Batteries required column.
For listed installations, batteries can be installed in a DMP Model 349, 350 or 352S enclosure and all wiring shall run through conduit. The enclosure shall be installed to the left of the XF6 Series enclosure to ensure Battery and Auxiliary wire separation.

If the Amp Hours Required calculation is greater than any Max. Ah Available number shown on a table, then add power supply(s) to power some system devices allowing the Amp Hours Required calculation to be reduced.