Forest wrote: ↑04 Jun 2020 09:09
Hi Peter.
The switch can handle a constant 500A draw through the unit, it does not necessarily need 500A to operate.
So I'm guessing I need to consider the highest amps draw and from auxiliary battery and match cable size for that.
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I fully realize that it doesn't need the full 500A to work. However, in the features it notes that it allows paralleling the batteries when starting or winching. In that situation, it could easily draw the full 500A, without you having any control over it. If it melts those cables, that's a huge fire risk. I guess one doesn't need the high efficiency under those situations, but also I have no idea how small one can go before the whole setup becomes a fire hazard, but my guess is that 25mm^2 is well into the fire risk category.
If the system is such that you can control the paralleling, and decide never to use it, you can probably size the system to about 70A. But that means that, for the price of skimping on some cable, you have no self-recovery options for a flat battery situation...
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