Battery replacement

While thy may try too, the weight of your 8D is more than two 6V. Tell them I'll buy them else where.

wa8yxm wrote:

mike brez wrote:
Still not shure what way to go. Cost wise the 12v deep cycle is cheaper by $56.00 for the batteries plus I will need to add in two core charges and a few cables to go with the 6v. Also the 12v fits like a glove in my battery compartment. Using the 6v it is perfect fit length wise the width will be 4 inches less. I guess I could put a 2x4 between them. As for the weight I can still pick them up.

Uh, Why would you have to add in two core chargers?

The fact is there are NO SIX VOLT BATTERIES in RVs (oh yes folks I know I have a pair of them myself)

What you have is a 12 volt battery (A 4D if you wish to know the size) that is made up of two Six Volt batteries.. You wire them in series like this

Bat-ery
And you treat them like this
Battery
As though they were a single 4D, one charger, No special anything. they form a big 12 volt battery.

I often see questions like "Can I replace just one" or "Must they be the same size"

Well, would you buy a 4D that was half new, half old, Or half 4D half something smaller?

Thinking of the pair as though it was a single 12 volt battery.. Very simply answers these questions.


HOWEVER: That said: 56 dollars cheaper for the big 12 volt .. now that is a sales point.. I agree with cheaper :) GO FOR IT.

Thanks for the reply. As for the core charges I will onlly have two 8Ds to trade in and will need four 6v golf car batteries. Won't they charge me two core charges?

I did a test of my 11 year old Interstate 27 starting batteries before replacing them . Each by it's self would start my ISL and each load tested at 50% of their 1000+ CCA. Two 8D for starting that small an engine is absurd but it's your money. Because I was able to keep my old batteries I did buy new and put the old in a machine at home to see how much longer they will last.
* I did have some fun. With the Interstate rep when I asked that I needed some helpf deciding to go back with their battery. He asked What's the problem? and I answered they are only 11 years old. :B

mike brez wrote:
Still not shure what way to go. Cost wise the 12v deep cycle is cheaper by $56.00 for the batteries plus I will need to add in two core charges and a few cables to go with the 6v. Also the 12v fits like a glove in my battery compartment. Using the 6v it is perfect fit length wise the width will be 4 inches less. I guess I could put a 2x4 between them. As for the weight I can still pick them up.

Uh, Why would you have to add in two core chargers?

The fact is there are NO SIX VOLT BATTERIES in RVs (oh yes folks I know I have a pair of them myself)

What you have is a 12 volt battery (A 4D if you wish to know the size) that is made up of two Six Volt batteries.. You wire them in series like this

Bat-ery
And you treat them like this
Battery
As though they were a single 4D, one charger, No special anything. they form a big 12 volt battery.

I often see questions like "Can I replace just one" or "Must they be the same size"

Well, would you buy a 4D that was half new, half old, Or half 4D half something smaller?

Thinking of the pair as though it was a single 12 volt battery.. Very simply answers these questions.


HOWEVER: That said: 56 dollars cheaper for the big 12 volt .. now that is a sales point.. I agree with cheaper :) GO FOR IT.

Hi,

Not even close.

Sully2 wrote:


Would two of these be equevellent to two of the 8Ds?

I'm going to keep the 8ds for starting. Just not shure what way to go on the house side.

TWO 8D for Starting!!!!!! WOW That must be one hard to start ride.

Short answer to your question is yes.. Unless that starter draws like a thousand amps (200 perhaps, 1000 never) it should not be a problem at all.

Still not shure what way to go. Cost wise the 12v deep cycle is cheaper by $56.00 for the batteries plus I will need to add in two core charges and a few cables to go with the 6v. Also the 12v fits like a glove in my battery compartment. Using the 6v it is perfect fit length wise the width will be 4 inches less. I guess I could put a 2x4 between them. As for the weight I can still pick them up.

I originally had three Deep Cycle 8D AGMs in my trawler. One for each engine, one for house. As they expire I am replacing them with two sealed deep cycle wet cell batteries that I can handle by myself. An 8D is b++++ to handle. Properly maintained an AGM can last a very long time. I have one left that is about 8 years old and is probably needing to be replaced this spring. It will be my last AGM. For extended dry camping in an RV or long cruises with a boat, the 8D AGMs are hard to beat but for the average RV user probably not worth the cost. And impossible for all but the very physically strong to handle.

Matt_Colie wrote:
Where some of you people get your information is highly suspect, but I did do a whole lot of electrical upgrades to performance cruisers (these are usually retired racing sloops), and ALL 8D are about 170#. A single 4D is only about 130.

While I don't know what you are starting, but if it takes more than one 8D, figure out what you are doing wrong. As a licensed ship's engineer, I know what it takes to start an engine.

Matt

Country Coach installed 2-8D chassis batteries and 2-8D house batteries along with a single 12volt for the generator. The motorhome engine is a detroit series 40