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Spockie-Tech
Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
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Dont worry, 4 x 18v drills at 24v will probably be OK.. Especially with a fan..
12v drills at 24v uses much more current than 18v up to 24v will, so you have a fair bit more safety margin there.
It also depends on how beefy your batteries and associated wiring is as well.. most wiring jobs with a connector or two in them and average batteries will voltage sag a bit under load, which helps reduce the stall-power load somewhat as well..
If you have high-current batteries, thick short wires, and good connectors, then in a stall situation, all the power has to go somewhere, and its either the IBC or the motors that have to burn it all up as heat. neither of them is going to like it..
When I say "stall" however, I mean *sustained* stall.. the IBC will cope with *brief* surges over 100amps if its given a chance to cool off in between.. But if you lock up all 4 drive motors, and keep pushing at full power for 30 seconds, thats asking a lot. 4 x 12v drill motors stalled at 24v have a theoretical (ignoring supply voltage drops etc) current consumption of something like 350+ amps.. keep that up on a 50amp controller and something is going to smoke..
If you do use a tornado-producing fan, make sure you put some form of crud-filter on it (I hear a piece of stretched-over womens stockings work well as a fine mesh), otherwise you will suck every piece of metal filings up and blow it all over your PBC. thats guaranteed to produce a boom..
But KO and Rat are both running 4 x 24v drills.. Rat did blow his IBC once, but thats once out of a lot of fights and demo's over 2 years.. _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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