All you guys with the "get a bigger alternator" recommendations are completely ignoring the fact that his Honda's ELD circuit will work against him. If the ELD circuit detects no load on the electrical system from the vehicle's fusebox, it generally reduces alternator output back to 12.5 or so volts in order to "save energy". Granted, running the AC or Parking lights should get the voltage back up, but I've seen the ELD kick in while sitting at a stop light with the AC and headlights on.
Also, don't go thinking that you can just pull the ELD out of your fusebox because it will throw a CEL and possibly put your car in limp mode.