Motorola MOTOTRBO SYSTEM PLANNER Specifications download pdf (Page 87)

Number of Battery Cells

When AC power is interrupted in a battery revert configuration, a typical 12 cell lead-acid

battery (two 6 cell battery packs) will yield approximately 25.2VDC. Notice from Figure 24 that

25.2VDC results in a maximum of 95W output power at the initial moment of the battery

bank’s discharge.

If a 13 cell lead-acid battery is used (13 individual cells) instead, the battery bank will yield

approximately 27.3VDC, which would allow the full maximum output power of 100W to be

achieved. All other things being equal, this will also result in a longer run time in battery revert

mode before 21.6VDC is reached. This configuration can be supported by the charging system

noted in the “Battery Charging System and Wire Gauge Determination” section of this

document.

Battery Charging System and Wire Gauge Determination

The MTR3000 station does not provide an integrated battery charging function. If battery

charging is required for battery revert functionality, then the use of an external Motorola

approved battery reverting charger is required. See

Table 31.

Table 31. MTR3000 J5 System Backplane Connections

• L1884 Battery Reverting 24V DC charger requires, in addition, the following cables:

o CDN6226A CHGR LOAD CABLE MTR2000 ( to connect the Battery

charger with the MTR3000 Base Station Power Supply)

o CDN6227A CHGR BAT CABLE MTR2000 (to connect the Battery charger

to the battery)

Consult the Battery Reverting Charger Detailed Technical Specifications for information regarding

charger specifications, battery selection, wiring gauge determinations, and precautions.

AC Breaker Recommendation

Each MTR3000 should have its own AC supply breaker in order to ensure that a fault which

causes the breaker to open does not result in the loss of multiple transmit channels. However,

multiple MTR3000 stations could be supported on a single circuit (see “Power and Energy

Consumption Curves” section).

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Motorola MOTOTRBO SYSTEM PLANNER Specifications Page 87