d-mac1 wrote:
One of my 12V dual purpose batteries has a bad cell and the other is fine. I've read on here that the dual purpose aren't preferred cuz we don't need the CCA for a genny so I'd like to replace the bad one with a pure deep cycle battery, but I don't know if there is a downside to having 2 slightly different batteries hooked up in parallel?
I've currently got two of these Deka DP27 (dual purpose) batteries:
http://www.easternmarine.com/deka-12v-marine-master-dp27-dual-purpose-battery
Walmart has the following Everstart Grp 27 deep cycle batteries which per the Q&A has a 109 amp hour rating:
http://www.walmart.com/ip/EverStart-27DC-6-Marine-Battery/16795212#Specifications
I can't find the amp hour rating of the Deka's but it says 150 min at 25 amps.
What do you think? Can I hook a regular deep cycle with the remaining dual purpose?
Thanks!
Easiest solution is to get 2 6v golf cart batteries from Sam's or Costco and a crossover cable from NAPA, or the like. Unless you get really expensive 12 batteries, there really aren't "deep cycle" 12v batteries. The ones at Sam's or Costco run about 80-100 each. I did the change 2 years ago and love it. I have about 50% more capacity than I did with my 2 12v "marine" batteries. With 12v batteries, the "quantity" of electricity you have (measured in amp hours) is fixed, no matter how many you have; with 6v, the "quantity" is cumulative. My 2 6v batteries are about 110 a/h each, so I have about 220 a/h capacity. My old 12v batteries only gave me about 150 a/h, total. The real off-gridders use 2v batteries, and can last for days and days without charging.
Lyle
