Battery Size Chart

A short while ago I gave a presentation on marne battery and charging systems to a group at a local marina. One item that we discussed was battery groups and sizes and to that end I compiled a chart of the sizes most common to marine applications. I have since been asked to post that information here.

Batteries Size Codes

Group 24       60-85AH     11X7X10”       50-55 lbs

Group 27     85-100AH     13X7X10”       60-65 lbs

Group 29     100-110AH   13X7X10”       65-70 lbs

Group 31   105-115AH     13X7X10”       70-75 lbs

4D             210-225AH       21X9X9”       135-140lbs

8-D           225-255AH     21X11X10”      160-175 lbs

6 Volt GC   200-240AH   10X7X11.5”      60-70 lbs

I would like to add that this information is averaged and that may be accurate to within about 6mm (1/4″) or so on size and that the capacity may be more or less 10%.

Battery size codes Eg: Group 27, 4D etc. refer to the physical size of the battery only and it is not indicitive of the capacity.

You will also note that Groups 29-31 are all listed at the same size. Again some may be slight larger and some slightly smaller.

At the bottom the 6 volt battery is labelled GC. This stands for Golf Cart and being 6 volt, 2 batteries must be wired together in series in order to produce the 12 volts that is commonly required for marine applications. When you compare a 6 volt battery’s space requirements as apposed to their current capacity the advantage becomes very clear. Another note about 6 volt batteries, that is if you’re considering going this route is that while they have a slightly smaller size foot print and they are taller than their 12 volt counterparts and this needs to be considered in the planning.

By |2019-01-15T13:33:35-05:00January 15th, 2019|Battery and Electrical|Comments Off on Battery Size Chart

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