Starting Batteries (Engine only!)

[Pete Masterson]

Gregg,

I think another answer may have crossed this one. The previous owner installed Deka brand type 31 AGMs for the engine batteries and type 4D (8A4DM is a type 4D) Deka AGMs (probably the same model you list) for the house batteries. Due to a probably too-deep discharge while in various dealer's hands, my house batteries were not holding a reasonable charge. I replaced them with a different brand (best price) but otherwise similar type 4D AGM batteries and now I have no problem with the house batteries.

The original type 31s are still in use and seem to be doing the job. Once or twice, in the winter in Denver, I had to use the switch to join the house and engine batteries to get the DD to start up. (I've since learned to use the engine pre-heat more effectively.)

The key is the total CCA needed. 3 type 31 provide approximately 1000 CCA _each_ so 3 batteries together deliver a total of 3000 CCA. The Type 4D batteries offer about 1100 CCA (each) so it would still take 3 batteries to replace the 3 type 31s. And that's not practical as they won't fit. 

I think the AGMs are probably likely to handle the long sitting period better than regular wet cells, but wet cells, if properly maintained will last a very long time as well.

Pete Masterson

'95 Blue Bird Wanderlodge WBDA 42

El Sobrante CA

"aeonix1@mac.com"

On May 26, 2008, at 7:00 PM, KB9BG wrote:

Pete:

 

Thanks for the reply and you might view my reply to Greg on this issue…

 

I mentioned in my reply all the findings on the Deka SeaMate & RV batteries that I have for the “House” use.  They have a part number of 8A4DM / 1420MCA as listed on each battery with a 1110 CCA and 198AH @ 20HR.  They list on the side of the battery that it is “Good for Engine Starting” and I agree with you of not having to mess with the watch of watering the batteries, etc. this would be the preferred route as an end user….Thus the reason for my poll of GROUP thoughts…..

 

I might have to do more research on the CCA issues, etc. on batteries in this application, but I was thinking in regards to the coach setting with storage, high fuel issues for all of us.