Trying to follow the calculation to determine how long my battery will last before it needs recharged. To figure out the solar, generator, etc requirements.
I have a Interstate SRM-24 550 CCA 690 MCA (that's what's on the battery). If i go to the Interstate website it does not give me, or at least I can not find it, how many amp hours this thing holds. I am sure not much, but would like to know.
Depends on the load on the battery... with a 5 amp load, you have 16 hrs, at 15 amp load, you will last 4.6 hrs.
this is from their web-site... see below
2oldman, it did make me think that. But the SRM-24 is listed under the RV Marine batteries on the Interstate website.
JFG, so does that mean that battery only holds 82 amp hours? If that is the case, does that mean if I run the LP Detector (assuming 1amp) it would drain the battery dead in 82 hours? If that's the case, I think I need a better battery, no? This is the battery that came with the trailer.
x5erman - I believe you are right, in that the battery is an 82 amp/hr battery. However, you should "run" your battery between 100% and 50%. This means from full charge (82 amp/hrs of capacity), you have 41 amp/hrs to use, which will get you down to 50%. Then it's time to recharge. You can go lower than the 50% level, but it hurts the battery in the long run.
Like the Holiday Inn Express commercials - I'm no expert, but I did just read "The 12 Volt Side of Life"
Don't fool yourself into thinking you can calculate anything closer than 20% as the temperature, cycle to cycle variances, use profile, age and other factors can influence battery capacity that much.
The only way to really tell if you have enough battery is to experiment and learn through experience.
CVD wrote: You should "run" your battery between 100% and 50%.
Unplugged, it is less efficient to charge a battery all the way up to 100%, as it uses a lot of generator time. So, your ideal operating range is closer to between 50% and somewhere between 80 and 90%.
To add to the cautions, a dual-purpose battery suffers more from deeper discharges than a single-purpose deep-cycle battery.
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