House batteries not up to ah rating
Bought 2 new Interstate SRM-24 group 24 RV/Marine batteries a few months ago. I have used the MH 4 times on trips lasting from 3-6 days. Never going below 40 amps before recharging. The rating is 85...
Forum Discussion
If you go to Interstates website, you can see the AH capacity depends on the draw.
At 5 Amp draw it is rated 16.4 hours = 82 AH capacity
At 25 Amp draw it is rated 2.3 hours = 57.5 AH capacity
Amp Hour ratings used to usually be the 20 hour rating. BUT now you need to do a lot of reading to see what you are getting, lots of companies are advertising readings on different draws.
I have a pair of no-name 6V GC batteries, rated 300 AH, nowhere can I find at what hour rate that is (I suspect its the 100 hour rating). In real life, I'm sure they are really about 220 AH at the 20 rating.
Doug
At 5 Amp draw it is rated 16.4 hours = 82 AH capacity
At 25 Amp draw it is rated 2.3 hours = 57.5 AH capacity
Amp Hour ratings used to usually be the 20 hour rating. BUT now you need to do a lot of reading to see what you are getting, lots of companies are advertising readings on different draws.
I have a pair of no-name 6V GC batteries, rated 300 AH, nowhere can I find at what hour rate that is (I suspect its the 100 hour rating). In real life, I'm sure they are really about 220 AH at the 20 rating.
Doug
