From The RadioReference Wiki
UPS & Battery Backup
How to calculate what size battery system is needed for emergency backup
1. Find the current drain in Amps during transmit, receive and stand-by operation for each piece of equpment you will be attaching to the battery backup system. This usually can be found in owners manual specs page or on the internet.
2. Determine the equipment's Duty Cycle.
Duty Cycle is expressed as a series of three percentages:
|0||80||20||for a Scanner (low)|
|5||5||90||For a Transceiver (Medium)|
|100||0||0||For a Transmitter TV broadcast (High)|
3. Use the following formula to calculate the average current required per device.
- Where i is the DC current in Amperes required during transmit (TX), receive (RX), and stand-by (SB)
- Where %Duty is the duty cycle represented as .xx ie. .50 is 50%
Average Current in Amps = (I_TX)(%Duty)+(I_RX)(%Duty)+(I_SB)(%Duty)
4. To determine the battery size required, multiply the average current in Amps by the number of hours of backup power required.
Battery/UPS Size = (Average Current in Amps)x(Number of hours backup power required)
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