Get Motorrad Elektrik's new Omega 450 system.
You can run a big headlight, heated grips and clothing, and still have ample power to run anything else.
It has saved my tail riding year round. Sure, there are others out there, but this one is da' bomb.
Pastor, Church of the Horizontally Opposed Air Cooled Twin
'66 BMW R60/2, '83 BMW R100RS,
'81 BMW R100RS "Das Beast", '77 Honda XL125