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 Electrical Wiring		  New Topic  Topic Locked
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Ape-X
Admiral

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USA
662 Posts
Initially Posted - 05/14/2013 :  04:44:26  Show Profile
I am completing wiring tasks (FINALLY) this year. How are you sizing wiring from the battery? I did calculations to find the amp draw with EVERYTHING on. Likely that would never be the scenario, but do you size for that anyway?

Bluesea systems has a nice chart for determining gage wire based on length of run and amp draw for 12VDC systems.
s/v No Worries, O'Day 28
PO Moe'Uhane - C25 SR/FK #1746
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redeye
Master Marine Consultant

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3476 Posts
Response Posted - 05/14/2013 :  05:12:39  Show Profile
http://www.catalina-capri-25s.org/manbro/pictures/owners11.gif

from the manual on this site.. pre 1988 html
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CarbonSink62
Navigator

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USA
208 Posts
Response Posted - 05/14/2013 :  07:25:06  Show Profile
I slowly rewiring and going to LED lights; w/ LEDs the line loss can be as much as the light draws if the system is old and/or compromised.

I tossed the calculations and decided to run 8 gauge from the battery to the panel.

Ken
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Ape-X
Admiral

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USA
662 Posts
Response Posted - 05/14/2013 :  09:39:21  Show Profile
I made a spreadsheet with all circuits, including adding provisions for an automatic bilge pump. It also includes VHF radio, CD stereo, Chartplotter, Auto-Pilot, small DC fan, LED cabin lights, running lights,foredeck (bow) lights, steaming and anchor lights, but the biggest possible usage is whatever gets hooked to the DC cigarette outlet(s). Of which I installed a dual outlet to replace the rusty oem unit. All of that adds up to amost 50a! That would be 6ga.

I've mentioned before about running two separate circuits, the OEM panel and a sub panel. Everything on the sub-panel has it's own on/off switches, so I am employing a low cost solution: fuse distribution panel. The battery selector switch works backwards from a single battery. Since we use very little of what is available, I am still prone to size for worst possible case....
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awetmore
Master Marine Consultant

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USA
1144 Posts
Response Posted - 05/14/2013 :  10:15:35  Show Profile
If you use a smaller wire then just set the fuse size to the wire size, not the load. This way if you have underprovisioned and do turn on everything then you'll be protected by the fuse.

A battery monitor (Xantrex and Victron make nice ones) will give you an idea of real power consumption, not just the maximum listed on the devices.
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Ape-X
Admiral

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USA
662 Posts
Response Posted - 05/14/2013 :  13:08:33  Show Profile
excellent explanation awetmore. I spoke to our electrician at work to make sure I was following a good path. Size to all fuses, and each fuse as general rule of thumb would be approx 125% of full load draw for the equipment.

I am anxious to complete this project!
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.