Originally Posted by Sailagain
So the engine batteries negative connection should first be attached to the shunt as well? And then to the boats negative bus? Just like the house bank? . . .
And I am guessing the inverters negative connection (currently attached to 1 house and the engine battery) should just go directly to the boats negative bus. Not sure why they would attach it to the batteries like this. Crazy
NO - The engine battery negative battery cable should be connected to the engine block.
- - Then there should be a separate battery-sized cable that is attached to the engine block and runs to the boat's negative terminal bus bar/terminal.
- - It is important that the Engine Battery be grounded to the Engine - first. The purpose of the Engine battery is to provide power to start the engine and a "good" clean ground connection between the battery and the engine is critical to this purpose.
- - Then from somewhere on the engine, a different battery cable will be attached and connects the Engine to the boat's negative bus bar/terminal blocks.
- - Think of the whole battery systems as 2 totally separate power supplies. The Engine Battery provides power to the Engine Starter to start the engine. So the Engine Battery negative terminal cable goes from the engine battery to the engine block. The Engine battery Positive cable goes to a battery switch and then to the Engine Starter. That is one complete system. **I am going to ignore the battery charging
system for now, it can be discussed after the basics are understood.**
- - The House batteries #1, #2, and #3 make up a separate power supply that feeds 12VDC electrical equipment
you have installed in the boat. The House batteries have all their Negative Terminal battery cables connected together and then connected to the Shunt as in the diagram I posted earlier.
- - In the diagram you will see that the "other" side of the shunt has a cable that goes to the boat's Negative bus bar/terminal.
- - You can disregard the auxillary battery shown in the diagram. Or you can pretend that the auxillary battery shown in the diagram is the wind generator
. In that case the negative cable from the wind generator
is either attached to the "other" side of the shunt or to the boat's negative bus bar/terminal - it does not make any difference which way it is done.