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ContinuousWave: Small Boat Electrical
Battery Cable: Size Needed
|Author||Topic: Battery Cable: Size Needed|
posted 11-17-2006 04:29 AM ET (US)
I need some information on moving my battery from the bilge compartment to under the center console on my 19-foot center console. It looks like I need 18-feet of battery cable. Will 2-AWG work? Or do I need 1-AWG? Thanks.
posted 11-17-2006 08:09 AM ET (US)
The owner's manual for your outboard motor will have information on the necessary size of the cable to use between the outboard motor and the battery. If you follow the recommendations for the outboard motor starting current you should be fine with all other loads.
You can calculate the voltage drop using
posted 11-17-2006 10:51 AM ET (US)
its says under specifications in the owners manual (alternator 35 amps), im not sure if that's the draw on a 2000 Johnson 150 HP engine
posted 11-19-2006 11:02 PM ET (US)
If you go with the larger cable the electric current flows easier and is probably better for the starter and battery.
posted 11-20-2006 12:07 AM ET (US)
Villagerecorders - AWG-2 should work fine - as the recommended allowable current is 95 amp - which will certainly cover the current draw of your starter. Consider getting the marine grade cable which is somewhat more expensive, but it eliminates the corrosion problem. --- Jerry/Idaho
posted 11-20-2006 04:34 PM ET (US)
35 amps is what the alternator puts out. The starter will
probably draw more, possibly a LOT more in cold weather.
I've got a service manual for roughly that motor, but I
won't be home to check the spec until Tu. night. If nobody
posts an answer before then, I'll get it for you.
The starter on my truck is speced at 90A with NO load, and
posted 11-20-2006 08:25 PM ET (US)
You may have to consult the rigging manual for your motor. It will provide information about the size of wire needed versus lenght.
posted 11-21-2006 02:30 AM ET (US)
FYI, I replaced the old battery cables on my 70hp Johnson with AWG#2. Charging battery is one thing, but the starter asks for a big power (lot of amperes).
posted 11-21-2006 05:48 PM ET (US)
Service manual says 30 A at no load for the starter.
Net: 1 ga.
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