At 07:19 AM 9/14/2011, David Beierl wrote... >Two in parallel would give you 150 amps, continuous rating, surely >enough for jump starting just about anything given that the big load >lasts only a few seconds. It doesn't work that way. At those loads, any change in contact resistance is significant. You only get 150 A if the contact resistance is _exactly_ the same between both sets (and it won't/can't be), otherwise one side will end up carrying more current. Peak load when jump starting is more than 150A, that's sounds like the sustained load when turning a small car engine (jump start an American V8 in the winter, and it's going to be more, still). They make bigger Powerpoles (up to 310 A capacity). If more than 75 is needed, just pick a bigger set. PP75=75A PP120=120-230A PP180=180-310A (the PP120 and PP180 have heftier contacts available now than when they were first developed, which is why the max capacity ratings don't match the model #'s) |
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