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I plan on connecting a BMV-712 to my motorhome's chassis battery. Given that this battery bank has significant draw from the engine and generator starter and the batteries are typically rated at upto 1000 CCA, I'm wondering if I need a shunt larger than the standard 500A. If so, how do I determine what size is needed?
@snellings, ideally you would use a Hall Effect meter capable of measuring inrush current to determine how many amps are actually drawn when starting your motorhome, but as those are generally expensive, the simplest solution is probably to just figure your max cranking amps and then get the next-highest-rated shunt. In your case, since you mention 1kCCA, you could get the 1kA shunt (article no. SHU102050200) or, to be on the ultra-safe side, the 2kA shunt (article no. SHU202050200).
Thank you. If I have two 12V batteries connected in parallel, would that double the size requirement or does the two batteries merely provide additional capacity (Ah) without added amp draw?
