I checked my panel box and only saw something that said "Interruption Rating: 10,000A" which I hope means the panel box can take 100 amps. Now how do I figure out what each circuit can take? I've heard both 15A and 20A are popular, which is a pretty big difference.
To be honest if you can run a cooker on your circuit board then I am sure your setup will be just fine. Most household cookers run on a 30 amp fuse the same as a shower unit which by the way are both the biggest power draining appliances in your home. Fans for your setup will run on a small 3 amp fuse and lighting should run on a 13 amp fuse so I should imagine your setup would be just fine. If not try using some CFL lights which will only use a small amount of the power than HID or HPS will use. Hope this helps. Wrams ~