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ContinuousWave: Small Boat Electrical
Wiring a Second Battery & Blue Sea ACR
|Author||Topic: Wiring a Second Battery & Blue Sea ACR|
posted 12-10-2007 12:26 AM ET (US)
I am adding a second battery. I purchased a Blue Sea Systems "Add a Battery" system with Dual Battery switch and ACR with starting isolation. This is the diagram I drew up showing wire gauges, approximate lengths, and fuse sizes. Can anyone please tell me if it is OK as is, or can you recommend any changes? Are the wires and fuses sized appropriately?
The accessories I have on the house circuit are GPS/Fishfinder, VHF, stereo, 2 ch amplifier, bilge pump, trim tabs, nav lights.
The Blue Sea diagram shows the ACR connected directly to the battery, but I was planning to wire it to the switch instead to limit the number of wires run to the batteries. It should be the same result, right?
posted 12-10-2007 08:32 AM ET (US)
I use the BEP 716 Battery Distribution Cluster to do the same thing. I have a 210 Ventura powered by 225 Opti. The Opti has a 60 amp changing capacity and requires a 1000 MCA to start. My starting system includes two 1175 MCA rate AGM batteries, one blue sea fuse buss 12 position, and one 50 amp blue sea 50 amp fuse block.
My whaler came from the factory with 4 awg wire from the Opti to the battery switches (about a 16' run) so when I changed to the BEP 716 distribution cluster I stayed with that wire configuration. I use 6 awg from the house battery to the fuse block to the fuse buss. From the the fuse buss to my installed marine electronics I use 18 awg wire. To the AC panels and starting switch I use 14 awg wire.
Guest Battery Charger
I don't think there is any need to use 0 awg wire.
posted 12-10-2007 08:34 AM ET (US)
Here's the corrected link.
posted 02-22-2008 12:31 AM ET (US)
This is my latest drawing, now including an onboard charger and a normally-closed relay to disable the ACR when charging with the onboard charger. This relay is per Blue Sea's recommendation ( http://bluesea.com/viewresource/94 ).
I am not sure if I need a fuse where I have it shown in purple, but I am leaning toward using one.
I would appreciate any feedback, good or bad, before I wire it up... soon.
I had my starting battery tested and it failed. So I took back the flooded deep cycle battery I originally bought as a house battery, and instead bought two Cabela's AGM Group 24 batteries.
posted 02-22-2008 01:03 AM ET (US)
I like your set up with the NC relay and the dual bank charger. I'd include a fuse; it is always a good idea when 120-VAC is involved. Also, carefully isolate that wiring to the relay so there is no risk of grounding or splashing water. I think you have a developed a very nice configuration.
posted 03-04-2008 03:58 PM ET (US)
What is an NC Relay for?
posted 03-04-2008 06:22 PM ET (US)
"This is my latest drawing, now including an onboard charger and a normally-closed relay to disable the ACR when charging with the onboard charger. This relay is per Blue Sea's recommendation ( http://bluesea.com/viewresource/94 )".
sitotis said it in the first line. You must have missed it.
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