My engine Batts were AWOL this spring. Interstate 8D's ...Each had a bad cell. Since I am able to buy from my local distributor at dealer cost and they were only 24 mo. old I took them back. Meanwhile I took the 2 good house batts (also Interstate 8 D's) and installed them into the engine start position. I would like to install AGM's but I'm not ready to spend that much yet. My Interstate distributor had two SRM 4D's ...Deep cycle that will fit into the same space. They made me a deal that I couldn't refuse so now I'm trying to figure out how long they will keep the 120V fridge running. Their specs are:
RC min.=390@25A (Does this rating mean they want at least 25A recharge rate?)
38 hrs @5A
11.5 hrs @15A
6.5 hrs @25A
I'm assuming those ratings are at 12V and would yield 22 hrs@ 7.5A average..
I'm also assuming that the fridge will consume 5 to 10 amp @ 120V so after converting to 120V would net approximately 2 hours. SSSoooooo having two batteries should last approximately 4 hours...???
Somebody please confirm my brilliance or gently point out my folly!!!!
Here's a link to the interstate spec page:
http://www.interstatebatteries.com/c...o/marine_f.asp