Originally Posted by Johnsrt
I have (2) AGM Group 24 house batteries and a 50amp multi-stage charger, 1000 watt inverter.
Assuming that you have the original Lifeline AGM batteries and the Magnum MMS-1012 inverter/charger, your battery life will be dependent on the following conditions:
• the average depth of discharge (DOD) that the batteries have experienced. The greater the DOD, the fewer charge cycles and associated battery longevity you can expect.
• amount of time left in a depleted state. The longer any battery is left in a deep DOD state, the more sulfation can form on the plates which will inhibit the batteries from receiving a full and complete charge, effectively decreasing the total capacity of the batteries.
• overall use of the coach. Many folks experience longer battery life when they rarely use their RVs, but keep them connected to shore power which will allow the batteries to be maintained in the float stage for extended periods. Minimal battery use also extends battery life.
The overall health of your batteries is impossible to ascertain without putting them thru a complete test with a conductance meter, as their history of charging and use is a complete unknown.
Once the battery capacity is determined, the number of available amp/hours of capacity can be calculated and they will provide you with up to 50% of their total.
Add up the loads you will be using and you can then determine exactly what your battery life will be for any given situation.