Figuring Battery Amp Hours
Please check my numbers and thought process and let me know if I'm okay or need to re-figure.
Is the industry's 20-Hour discharge rate for rating batteries figured at a constant 5 amps?
If so, 5 amps x 20 Hours = 100 amp hours ... To me, that means you can draw 5 amps for 10 hours and be at 50% depth-of-discharge.
My Interstate SRM-24 battery is listed as 76 amp hours on the manufacturer's website using the 20-hour rate. Using that same formula, I could draw 5 amps for 15.2 hours, or about 7 1/2 hours to 50% DOD. Considering all the variables in an electrical system, is that about right?