Motorcycle Repair: battery, wattage output, deep cycle battery

Question
Hello.
I have a bike with the following specifications.
bajaj kawasaki indian version.
Electricals of the bike are :

Battery 12V 9Ah
Alternator 3 phase AC
Head lamp 60/55W(Halogen)
Tail lamp 5W
Stop lamp 21W
Turn signal lamp 21W
Fuse 30A


Since i want to add additional 2 headlights and a horn I am planning a "second" battery. It should not to connected to the first battery in any way and must produce current in the same way the original battery does i.e using a seperate alternator and coils and all the things. Is it possible to design such a system and install it on the bike ?

OR

Is it possible to install some kind of small device that will increase the voltage and provide necessary power to light my 2 new 100 w helogen bulbs and a horn ?
Hope you can help
Thank you.
May God Bless You.


Answer
Samir,
  This is not an endevor to be entered lightly.  This will take alot of info from someone well versed in A/C to D/C charging systems, most likely an electrical engineer.  Typically in an auto you would just need to install a higher output altenator and a high capacity deep cycle battery or 2 standard batteries.  However in a bike you have one stator in a limited size housing beside the crankcase.  The stator's rotor would, if possible, have to rewound with more wire to increase it's wattage output.  Right now you are running approximatly 107 watts with your current accessories not counting the draw from the coil which at a charing constant of 14.4 volts should give you about a 7.43 amp draw.  Adding another couple of 60 watt lights and say a 5 watt horn would boost your wattage up to about 232 and draw about 16.1 amps. Two 9 amp batteries should do you ok but the stator needs to be modified or a second one engineered off the end of the first one.  You will have to have a custom voltage regulator and rectifier to replace the originals.

Sorry I can't work out the whole senario for you, not my area of experties.  Try an electrical engineer on Allexperts for a base wiring plan.

Good luck, sounds interesting,
Mike