Originally Posted by Phil57
I think you just left FR when I got there last Oct 28. Andy and Warren were telling me about the AGM batteries. I almost went for them but didn't. We had the old controller boil the old batteries twice and had to paint the compartment. Hopefully the new Magnum controller will help avoid that mess. It will be interesting to see how the AGM hold up. Do you have the new or old controller?
I ask your patience on this request for comments and/or info; it sounds to me like you have studied this topic to the nth degree, and might be able to help me.
I was out to visit Randy and Mitch for minor warranty issues earlier last fall, and asked why my house batteries discharged while going down the road with the inverter turned on and no load (but not when the inverter was off).
Their highly capable inverter tech/electrician gave me a rundown on the operation and design of the inverter, and I learned that:
• The inverter with no load will draw power from the batteries
• The alternator charges the chassis batteries first, then the house batteries second while driving
• The reverse is true when not driving, and hooked to shore power
• Holding the spring loaded "alt start" switch down will reverse this order
• Confirmed that the inverter will provide AC power to only the non-GFCI outlets
The tech didn't address the advanced issues/settings mentioned elsewhere in this thread. I have the house batteries on charge full time, and they don't boil over, but they do need a little distilled water once every couple of months.
Do you have any specs and mfg/model info for the AGM batteries Randy has? I assume they are 6V and hook up in the same fashion as the ones that come out (two in series, and the two pairs in parallel).
What is the difference between the "old" and "new" Magnum Inverters? How/where do I change the inverter settings for the new AGMs?