W1PNS / WAØITP / AB8XA Battery Life Estimator *
Based on Jim Duffy's (KK6MC) Battery and Charging Systems White Paper **
Revised Aug. 10, 2011

Batteries and Charging Systems for QRP - Chocked full of facts and well worth reading.

Mode Duty Cycles
SSB - 20%       CW - 40%       AM/FM - 100%       RTTY/Digital - 100%
       
The entries below are used to calculate the Battery A/H's
needed based on your planned operation.
  The entries below are used to calculate how long
a Battery will deliver the desired A/H's.

 
Duration needed in Hours -   - Battery Amp/Hour Rating
Mode Duty Cycle -   - Depth of Discharge (%)
Operator Duty Cycle (%) -      
Radio's Receive Current in Amps -  
Note - All Percentages must be entered as
whole numbers without a "%" sign
Radio's Transmit Current in Amps -      
         
Average Current Consumed -   - Usable Battery Amp/Hours
A/H Capacity Needed -   - Expected Battery duration in Hours ***
A/H Capacity + Reserve -      
 

* With WAĜITP and AB8XA mods of the original W1PNS Spreadsheet.
** Presented at OzarkCon 2006 and Pacificon 2005.
*** The greater the transmit draw is above the battery Ah Rating divided by 20, the lower the duration will actually be.

  • Modified and Uploaded with KK6MC and W1PNS permission - WAĜITP - 2 June 2011.
  • Corrected and modified - AB8XA - 5 June 2011.
  • Adapted for the "Web" - K5DCM - 13 June 2011.