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Wire size for additional house batteries

Khalid

Jetboaters Lieutenant
Messages
194
Reaction score
203
Points
157
Boat Make
Yamaha
Year
2021
Boat Model
255XE
Boat Length
25
Hi forum,
I’m adding 2 house batteries to my new 255XE.

Due to the lack of space in the back (bc of the ballast tanks),I will need to place the additional batteries under the bow seat which requires 15-20’ cables. What size cables should I use?

Thanks in advance!
 
Last edited:
@RobbieO wasn't discrediting your advice at all, was mentioning the charts. Will be helpful in the future as well.
 
I've mentioned this in other threads, but the charts are misleading. The amperage a wire can carry depends on it's construction. You need to know the wire you are buying and it's current carrying capacity and then size it accordingly. Here's a good example of what I'm saying below with cable from Knukonceptz. As the chart shows their 1/0, 4 and 8 awg cables have 3 different amperage ratings and it's all based on the cable makeup. If you are using the exact wire that's specified on the charts, then you will be fine.
Screenshot_20210501-170610_Chrome.jpg
 
I wouldn’t do anything less than 0 gauge. You spent 100k on a boat, no reason to cheap out now lol.
 
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