This calculator will help you estimate the expected battery life you will typically get from your speed sign. You will also be able to compare Houston Radar solution to a third party solution. Please enter desired values below and press Calculate button. For help with any input field hover the cursor over the field of interest and a help message will be displayed.

Avg. day time traffic density: vehicles/hour
Avg. night time traffic density: vehicles/hour
Avg. vehicle speed, mph
Battery Voltage: Volts
Battery Capacity: Amp*Hour
Display Max Power:
Display Min Power:
Display Off Power:
Houston Radar Device
Alternate Radar Power:

Battery Life Estimate:


Houston Radar Device: 0%
Alternate Radar: 0%


  • This calculator employs sophisticated statistical model to estimate battery life. However due to variability of traffic patterns, the above should be treated as a rough estimate. Actual battery life will vary based on actual traffic conditions, variations in traffic density and speed during brightness/darkness periods, battery performance and other factors. The above is not a claim or a guarantee.

  • Houston Radar products denoted with "*" in selection box are obsolete products and are here for reference only. You may also use these to determine migration path.
  • Alternate radar power is typical for a competing product. Alternate radar range is automatically adjusted to match Houston Radar range so that we are comparing apples to apples. That is why you see that the alternate radar's run time may change when you compare it to another Houston Radar device.
  • When you select one of the Houston Radar products that includes display pannels (e.g. PNL10, PNL18) we will automatically set display power consumtion. We will also assume that your alternate radar will be connected to similar highly efficient pannels. In order to see how the alternate radar performs with your actual panels please select Houston Radar device that does not contain display panels and enter your panel power consumtion.
  • Calculator assumes 100% discharge cycle for the battery. In case of a lead-acid battery it is prudent to limit the depth of discharge to about 50% to increase battery life. Other technologies such as LiFePO4 may not have this limitation.