[Maine Sail]

Just for grins I wanted to post this comparison.

One flooded 8D battery weighs about 135-145lbs., depending on the manufacturer, and produces between 210 & 225 amp hours using the industry standard 20 hour rating.

Two 6V T105 style or even Sam's Club 6V batteries weigh about 62 lbs each or 124 lbs for two and will deliver between 210 & 225 amp hours using the industry standard 20 hour rating. They will also have thicker plates than a standard 8D deep cycle and should theoretically last substantially longer.

So for the same amount of amp hours one 8D weighs on average slightly MORE than two 6V batteries yet it will break your back getting it on and off the boat!

The clincher is this though one 8D deep cycle battery is on average 21" Long by 11" wide by 10" inches tall for the for it's 225 amp hours of capacity.

So in a foot print of roughly 21 inches long (same length as ONE 8D) by 14 inches wide (only three inches wider than ONE 8D) and 10/3/8 high (only 3/8 of an inch taller than ONE 8D) you can fit FOUR Trojan T105's giving you DOUBLE the capacity at 450 amp hours in a a foot print only 3" X 21" bigger.

One 8D Deep Cycle = 225 AH at 21"L X 11"W X 10"T & weighs 135lbs.

Two 8D Deep Cycle = 450 AH at 21"L X 22"W X 10"T & weighs 270lbs.

Two T105 6V = 225 AH at 21"L X 7"W X 10 3/8"T & weighs 124lbs.

Four T105 6V = 450 AH at 21"L X 14"W X 10 3/8"T & weighs 248lbs.

To achieve an ah rating similar to the 6V's 450ah rating in smaller individual 12v deep cycle flooded batteries you could use four group 31 Trojan's (model SCS225) @ 225 amp hours each. Both the foot print and weight are slightly larger though.

Four Trojan Group 31 12V = 450 AH at 28"L X 13.5"W X 10"T & weigh 264lbs.

They do have thinner plates though and theoretically won't las as long as a comparable 6V.

That being said the Trojan SCS225 is an anomaly in group 31 12v batteries. Most group 31 12v batteries produce about 110 amp hours at the 20 hour rating not 225..




P.S. All measurements were rounded to the nearest..