If your bike has a small stator like mine there are a few things you can do to allow heated gear to work properly without discharging your battery.
HID headlight saves you 30 watts or so.
LED brake/running light, good for 10 watts.
LED turn signals a few more watts.
Run direct 12 or 14 gauge wire from your reg/inverter straight to battery.
Install voltmeter, worth it's weight in gold you can continually check the charging voltage. Even better get a current meter, a little more involved install (you need a shunt) but it tells you whether your charging or discharging your battery in no uncertain terms.
Turn your heated gear off about 5 minutes before your destination just to top off your battery before shutting down.
If you have a 2 headlight system install a cutoff switch to turn one light off.
Get the kick start option if it's available on your bike