Join Date: Jan 2003
Location: Maine Coast
Thanked 154 Times in 120 Posts
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Re: Updating DC System
Originally Posted by Boomer
Hi Maine Sail,
Thank you for the input. On my question #1 related to battery disconnect switches, I was assuming (I know.. I know...) that I would need to add a new disconnect (on/off) switch for each bank. The marine surveyor wrote "A single wire should lead from each battery bank to disconnect switch. That wire should be fused with slow blow fuse rated for wire gauge. All other wires should come off of buss bar aft of disconnect switch." I assumed he meant a separate disconnect switch for each bank close to the batteries before the busbars, and not the 1/2/Both/Off switch which will disconnect the batteries from the DC distribution panel but not isolate the batteries from the positive busbars and loads / chargers shown in ctj1950's wiring diagram. Am I misreading this requirement? I can add the on/off switches if needed.
Thanks too for the information about the Universal M-18 Alternator bracket. More work to do.
And to ctj1950... thanks for the diagram.. and fyi... my boat is on the hard in Mayo, MD... moving to Deale, MD in the spring. That close to you???
Catalina 27 #5688
PS... I didn't mean to start a grammar war!
You do not need additional ON/OFF switches on top of the 1/2/BOTH.... The only devices before the battery switch are items like the alternator, which should ideally be fused and ideally have it's own "service disconnect", perhaps a VHF, your bilge pump and any ACR or Echo type charger. On bigger boats and inverter may tie in before the batt switch, but should have its own ON/OFF and a windlass or thruster may as well..... Anything tied in before the batts switch should have sufficient over current protection.
Battery fuses should be ANL, MRBF or Class T....
-Maine Sail / CS-36T
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