Originally Posted by herk7769
...Most house batteries being shipped now are 75 amp hour ones. That means that at 20 amps draw; they will last 20 hours to dead...
Lou, I don't believe you have that quite right. A 20 hour Amp Hour Rating is the amps the battery can supply at a continuous rate for a 20 hour period (the battery being dead - not a good thing). So a 75 AH battery can deliver a constant 3.75 amps for 20 hours. In my case, I have a 260 AH rating so they can provide a constant 13 amps for 20 hours.
Reserve capacity is how long a battery will last at a particular amp usage. In my case I have a 450 min capacity @ 25 amps, so drawing 25 amps they would last 450 minutes. Again this is to complete discharge which is not a good thing.
Glenn & Beth (Dad & Mom)
David & Audra (12 year old twins)
2006 Dodge Power Wagon (Adventure & Tow Vehicle)
2006 Rockwood 8281SS (Home away from Home)