Metcalf
Expedition Leader
I have yet to see anyone drain their electrical system using their winch. I'm sure it can happen if you're system is defective (not a winch problem) or if the person using it is a numbskull (again, not a winch problem). If we're talking modern vehicles, most have relatively high output alternators. Load generates larger electrical demand, not speed. It's all kind of irrelevant as the operator can't vary the speed on an electric winch. You get what you get when you buy what ever model you choose.
We had more than one vehicle on last year 2015 Ultimate Adventure trip have issues with keeping the battery charged when winching. They would pull long enough that the voltage would drop low enough that the fuel injection computer/ignition would shut down. I can't say if all the vehicles had perfect charging systems, but most of them where running modern engines and alternators. We winched all 20+ vehicles up this monster of a muddy hill in North Carolina. It was probably 3-4 complete pulls for most of the vehicles. The time re-rigging for the next pull was not enough time to charge the batteries back up. I remember waiting for at least 3-5 of the vehicles to charge the battery enough to work correctly. Most winches have no problem pulling 200-300amps when pulling decently hard, very few vehicles have alternators capable of sustaining that for very long.
If you look at most of the Euro winch comp guys that are running high end electric winches, they have multiple LARGE batteries and it isn't uncommon to see more than one alternator. Beyond that, you start to see PTO and hydraulic drive winches.
I will agree that a modern vehicle with a modern charging system is enough for 99% of the people out there. I think a $500 winch is just fine too.