This is pretty much how my 3 battery system is wired on my boat. I agree that if you are going from 1 battery to 3 batteries on two banks you may need some advice but this isn't that hard to do.
You don't state if you want 2 separate banks or one bank with 3X capacity. If the latter it may be simpler to just get a much bigger capacity battery.
I have assumed the former.
- The diagram provides positive and negative connections to two "house" distribution buses.
- The diagram provides a separate circuit for the bilge pump
wired to the house so supply is available with the master switch off.
- The diagram provides sense line to the alternator
and output from the alternator
. I have a 60 amp internally regulated alternator
- you need a 3-way isolator switch. I put the start on "1" so I remember it is connected to "1" battery
- I could not fit battery boxes in the space available. I have sealed batteries and they are tied down to the plywood
floor with web straps screwed into the plywood
. Be careful not to have round head
screws under the batteries - eventually they will chafe through the bottom of the battery
- Battery boxes are better if you can fit them. Ideally all my battery positive terminals would have plastic covers to preclude them ever shorting out against something - It's on my to do list (sigh)
- The battery with the green strap is the start battery mounted on the starboard side. You will notice a red and black wire. That is the bilge pump wiring
which in the diagram is depicted on the house bank - (to do list)
- The other photo
shows the two house batteries with the parallel wiring connections. As scratcher suggests the negative cable should be attached to the aft battery and the positive cable is attached to the forward battery. This negative cable runs to the start battery negative and the start battery negative runs to the engine
block. It's less cable and electrically the same.
Batteries have huge potential to injure you and damage your boat. Be very careful when working on electrical
circuits and the secondary (big) circuits especially.
Disconnect ground (negative) cables
first and connect ground (negative cables