Times are changing and obviously so is Technology.

20 yrs ago when I had a 28 ft. Chris Craft Cavalier, I had 4-8D's for
all accessories, and a cheap car battery for starting, down in the
belly of the beast., I made my own battery isolator, adn the starting
bat. was independant. the 4 Cat 8D's did all the acessory power. We
spent weekends on the boat without firing up for recharge.

I didn't have any complaints with the system, and would do it again if
I had a similar craft. BUT, your situation is obviously different.

I wasn't aware that some companies made individual cell batteries, but
that makes sense, and is good to know that you can make your own custom
charging system to fit your needs, PLUS, be able to stuff individual
cells in empty space.

Good idea.


Chuck Gould wrote:
Jim wrote:
wrote:
Whats the matter with going back to 8-D's?

Golf cart batteries should/might be cheaper, easier to handle, take less
room, have more amps, and be better suited to the task.

That's why.





That's why....Rolls offers the single cell configuration. You bolt 6
(nominally) 2-volt
batteries (cells) together in an 8D case. Each cell weighs something
around 30 pounds, so that's all you need to handle at a any one time.
If the battery appears to fail, it will very likely be just a single
cell that has gone bad so instead of buying a whole new battery you
only have to buy one cell. Of course you won't have to buy anything for
7 years, as the first 7 years of the 10-year warranty are full
replacement coverage without any pro-rated adjustments.

Have you checked the ratings of a Rolls 8D vs. a pair of Walmart golf
cart batteries?
You might be surprised.

We have four battery systems on our boat, and one of them powers an AC
inverter. We do use golf cart batteries for that application, but only
because of a lack of available space to use an Rolls 8D.

A day of learning:

Two 6 volt, 220 amp batteries joined to make one 12 volt battery has 220
amps. Even though the guy at the battery store told me otherwise.

My old 8Ds had a rating of 215 amps. 220/215, not much gain there.

The cost of the 6 volt batteries is about 1/2 the cost of an 8D. A
little more or a little less. $65 + $65 = $130. 8D, $140. Not much
gain there.

What this means is that there is little gained, initially, by going with
the golf cart batteries. Since I have to buy battery boxes, it will
cost me more.

The golf cart batteries SHOULD be good for many more deep discharges
than the 8D. The golf cart batteries are easier to move around, and
have a smaller foot print. The battery boxes have more options for
dimensions.

I'm buying the golf cart batteries from a battery store. A few dollars
higher than Costco. Five dollars each battery. I get the cables free
from the battery store, so it's actually cheaper than Costco.

I'm upgrading my charger to a Xantrex "True Charge" 40 amp, 3 stage
charger. The "Equalizer" function is an important to maintain the
batteries.

The old battery boiler charger is going in the trash.

In article . net,
says...
A day of learning:

Two 6 volt, 220 amp batteries joined to make one 12 volt battery has 220
amps. Even though the guy at the battery store told me otherwise.

My old 8Ds had a rating of 215 amps. 220/215, not much gain there.

The cost of the 6 volt batteries is about 1/2 the cost of an 8D. A
little more or a little less. $65 + $65 = $130. 8D, $140. Not much
gain there.

What this means is that there is little gained, initially, by going with
the golf cart batteries. Since I have to buy battery boxes, it will
cost me more.

The golf cart batteries SHOULD be good for many more deep discharges
than the 8D. The golf cart batteries are easier to move around, and
have a smaller foot print. The battery boxes have more options for
dimensions.

I'm buying the golf cart batteries from a battery store. A few dollars
higher than Costco. Five dollars each battery. I get the cables free
from the battery store, so it's actually cheaper than Costco.

I'm upgrading my charger to a Xantrex "True Charge" 40 amp, 3 stage
charger. The "Equalizer" function is an important to maintain the
batteries.

The old battery boiler charger is going in the trash.

Did you check out the higher profile tractor batteries? If you've got
enough headroom, they could give you a higher amp-hour capacity in the
same footprint and not a lot more money...

jps

On Sat, 08 Jul 2006 02:26:53 GMT, Jim wrote:

A day of learning:

Two 6 volt, 220 amp batteries joined to make one 12 volt battery has 220
amps. Even though the guy at the battery store told me otherwise.

My old 8Ds had a rating of 215 amps. 220/215, not much gain there.

The cost of the 6 volt batteries is about 1/2 the cost of an 8D. A
little more or a little less. $65 + $65 = $130. 8D, $140. Not much
gain there.

What this means is that there is little gained, initially, by going with
the golf cart batteries. Since I have to buy battery boxes, it will
cost me more.

The golf cart batteries SHOULD be good for many more deep discharges
than the 8D. The golf cart batteries are easier to move around, and
have a smaller foot print. The battery boxes have more options for
dimensions.

I'm buying the golf cart batteries from a battery store. A few dollars
higher than Costco. Five dollars each battery. I get the cables free
from the battery store, so it's actually cheaper than Costco.

I'm upgrading my charger to a Xantrex "True Charge" 40 amp, 3 stage
charger. The "Equalizer" function is an important to maintain the
batteries.

The old battery boiler charger is going in the trash.



Hi Jim,

Not all golf cart batteries are created equal. It is my understanding
that the life cycles for the most popular golf cart batteries are
approximately 733 @50% DoD and 225 @80% DoD; whereas, another popular
brand claims approximately 1200 @50% DoD and 600-1000 at 80% DoD.
Surrette/Rolls publishes approximately 1280 cycles for their 400
series batteries at 50% DoD and 800 cycles at 80% DoD.

The point I would like to make is that the thickness of the plates and
DoD matter assuming that the batteries are properly charged and
maintained and the cost per cycle is something you might want to
consider.

Using a good "smart" temperature compensated four stage charger on wet
batteries is a wise investment.

Kindest regards,

BiLL.......