Okay thanks everyone. So basically I need to connect the negative post of the starter battery to the negative bus, then move the ground wire from the engine block to the negative bus.
Let me make sure I understand this correctly.
This means the starting current will pass from the positive terminal of the start battery, through the starter motor, then to the engine block, then through a wire to the negative bus and finally from the negative bus through a wire back to the negative terminal of the start battery. The starting current never passes through the shunt? If so then the wire from the shunt to the house battery need not be sized to pass starting current, just 50A max house current.
The echo charger negative goes on the negative bus.
The alternator line goes on the house bank, so that it can charge both the house bank/devices and charge the starter battery via the echo charger.
Scampi 30 MK-IV
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