You have to install the bus bar where the converter is, which is also where all the wires are too. It wouldn't make sense to splice extensions on all your wires to have the bus bar anywhere else.
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I would install the bus bars at the same time as you install bigger battery wires.? The bigger battery wires will require you to get bus bars that handle a wider range of wire sizes.? You don't want to do the whole bus bar thing over again to accommodate bigger battery wires installed later.
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And as I said before, if you don't have room for bus bars, go with split bolts.? That's not as good as bus bars, but it solves the problem of cracking multistrand wires.? I have about 40 wires that come up in a 5" x 5" area, so no bus bars would fit there.
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