AQD3 Series Installation continued
AQD3 Series Instructions: Doc.# 500-33000 Rev A
Page 5 of 15
Battery Selection
The table below shows typical standby time in hours for various loads and batteries. The table works for either 12v
or 24v batteries. The AQD3 has been evaluated by UL with an 18AH sealed lead acid battery for 12v and (2) - 9AH
batteries for 24v to meet the 4 hour stand by requirement.
Note: UL requires a minimum of 4 hours of standby time for Commercial Mercantile Burglar Alarm. The table below
has the required battery size highlighted to provide this 4-hr stand by time under a full rated load.
Approximate Battery Standby Time Table with a reserve of 3 Amps for 5 minutes for Alarm
AH = Amp Hours Capacity at a 20 hour rate - Hrs = Hours
Total Output
Amps
4AH Battery
Standby
7AH Battery
Standby
9AH Battery
Standby
18AH Battery
Standby
24Ah
Standby
1A 2.92 Hrs 5.32 Hrs 7.79 Hrs 15.89 Hrs 23.65 Hrs
1.4A 2.09 Hrs 4.75 Hrs 5.56 Hrs 12.61 Hrs 16.89 Hrs
2A 1.46 Hrs 1.3 Hrs 3.46 Hrs 7.94Hrs 10.64 Hrs
2.8A 1.04 Hrs 1.9 Hrs 2.47 Hrs 5.04 Hrs 7.60 Hrs
4A .73 Hrs 1.33 Hrs 1.70 Hrs 3.53 Hrs 4.73 Hrs
5A N/A N/A .9 Hrs 2.82 Hrs 3.78 Hrs
6A N/A N/A N/A 2.35 Hrs 3.1 Hrs
7A N/A N/A N/A 2 Hrs 2.7 Hrs
8A N/A NA N/A 1.6 Hrs 2.3 Hrs
The Battery recharge time is 2.6 hours for each 1 AH Amp Hour of battery capacity with either 12v or 24v batteries.
The minimum battery capacity is 4AH and the practical limit is 24AH UL evaluated with an 18AH battery on the 12v
configuration and (2) 9AH batteries on the 24v configuration. Please see the Figures for 12v configurations and 24v
configurations below in this document. UL Listed systems require that if standby batteries are to be used they must
have a 4 hour capacity under the full rated load. A small E-89 enclosure would require the batteries to be mounted
externally as shown in the following figures.
Please see the Figures for 12v configurations page 7 and 24v configurations on page 8.
Maintenance
The power supply and stand by battery(s) should be tested at least once a year as follows:
1. Check LED’s for normal state. AC ON Green and DC ON Red.
2. Check output voltage with normal load. With AC ON for 12v setting, DC output voltage should read between
12.83 Vdc-13.69Vdc and 27.1 - 27.4vdc on the 24v setting.
3. Check DC Output Amps to be sure it complies with output rating.
4. Disconnect AC input. AC LED should be off, and the DC LED’s should remain normal.
5. Check DC Output to be above 11.5vdc for 12v setting and 23.0vdc for 24v setting. This checks standby
batteries to be operational. Sealed lead acid batteries have a typical life of 3 to 5 years. Test battery by
itself as outlined in your battery instructions to be sure the Amp hour capacity is within proper range.
6. Re Apply AC and verify AC LED ON.
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