Marine battery group size chart and guide.
Boat battery cable size chart.
Single engine 1 starting and 1 house battery.
Actually for my current installation i ve sized all of my dc cables to meet the 175 amp worst case scenario.
This technical brief distills the information on these charts to a more manageable size for installers and boatowners alike.
Quality marine wire as specified by abyc standards will always be stranded rather than solid and always tin plated copper.
Deep cycle battery capable of deep discharge without harm.
The following maximum amps versus cable size awg come from the nec version 2011.
The two setups we most often run into is.
We ve included copper wire specifications which comply with the awg standards at the bottom.
Most of the cost is the ends and labor.
Additional space box or cables may be required.
Replacement of tray hold down or battery box may be required.
Starting battery has high current rush capacity.
In larger sizes each cable has matching terminals.
Most importantly sae wire is up to 12 percent smaller than american wire gauge awg boat cable which means that in many applications larger gauge wire must be used to stay within the voltage drop limits recommended by experts see our west advisor on marine wire size and ampacity.
Greatly generalizing the topic here but you usually run into two types of batteries in the size of boat we deal with.
As far as i know these values are valid as of today.
Cable size ampacity chart.
Boats come in various sizes and they also come with different accessories then.
Terminals need to be matched to their cables.
For very long cables for example 15 foot long battery cables to relocate your battery go one size larger.
Find the length of the circuit on the vertical axis of the chart noting that the length is the round trip distance from the panel or battery to the load and back.
In addition the dc wire selection chart shown below assumes a wire insulation rating of 105 c.
However the same sized terminals are sometimes used for more than one cable size.
The manufacturers make stock battery cables as small as possible but still get the job done.
For safety use only wire that is marked with size and type.
216 requires 2 batteries in parallel to meet oe specifications.
I recommend building cables larger than stock.
Marine outboard motor application guide.
Red terminals fit 22 to 18 gauge cables blue terminals 16 to 14 gauge cables and yellow terminals 12 to 10 gauge cables.
The wire size listed in the graph at the intersection denotes the gauge of wire to use.
A 16 gauge cable needs a 16 gauge terminal.
As we mentioned earlier picking the right size of the marine battery is crucial for your boat.
In summary when selecting the correct size of battery cable you need to take into account the total maximum amperage your electrical system requires the voltage of your system usually 12 volts the total length that your cables need to be and the amount of voltage drop you are willing to accept versus the amount you want to spend.
141 replacement battery may be longer taller and or wider than o e.
