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I have an auxiliary battery that runs everything but the wheels, so even if I've run my traction battery pack down all the way I still have head lights at full brightness, I can run my head lights for about 3 times as long as my traction battery, or charge it only every 3rd time that I drive it at night.
alot of people run a dc-dc converter that drops the traction battery voltage down to 12 volts, but often keep a small 12 volt battery in there anyway as a fail safe as dc-dc converters sometimes over heat or fail if they are useing close to their rated output for very long and the larger ones cost alot more then a small 12v battery.
so I've never had a problem driving in the rain at night with my electric car, but that's just me.
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