Manipulating variables between BLE advertising?

is it possible to stop sending advertisements? I have solar, so during the day the power use is zero (mostly). But because it is resending the last read value, I am currently just sending a 0 (zero) value for power every 30 seconds just to clear it. It is not energy efficient, as I am just sending zero all the time until the next pulse is read, which may be in the afternoon - hours later.
I would like to be able to check if last power value was zero and if it was, then stop advertising it.

  setInterval(function() {
    power = 0;
    if (sDate.getMinutes()==0) {
      update();
    }
    NRF.setAdvertising({
      0x1809 : [E.getTemperature()],
      0x180f : [Puck.getBatteryPercentage()],
      0x2a03 : [String(power)]
    });
    print("Battery and temp data sent");
  }, 30000);