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Which Shunt do I need (dummies guide)

hello all,

Spent a lot of time trying to find the answer to what might be a simple question. A buying guide would help iron this out.


I have two engines, one engine goes to an isolator which charges the following


two x XV31MF (aft) for the bow thruster (Total 220ah)
three x XV31MF (stern) for entertainment and engine start.(Total 330ah)


Reading the posts a 500am might be ok? My concern is the engines which are large volvo Penta start from battery bank 2. The batteries are say 1000 cold crank amps that’s 3000 CCA the shunts go up to 2000 amps.


So I am confused what amps I look at for the shunt


CCA is a lot higher than the amps


the above two groups are in parallel



Brand Numax
Range Numax XV
Voltage 12 Volts
Technology Wet
Capacity (C20) 105 Ah
MCA 925 A
CCA (EN) 740 A
BMV Battery MonitorVenus OSbattery chargingamps
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