Originally Posted by JCamper
Not trying to cause "ripples" in the water, but here is an article on AGM versus flooded.
Absorbent Glass Mat (AGM) Battery Information - Battery University
I have seen other articles stating the same thing, that an AGM is the best (albeit costly) way to go over a flooded.
In looking at the Trojans I can't fit anything other than their group 24 Gel based on the listed measurments.
I'm not sure what to do now... hang on to my Die Hards?
NO...that is simply a DEAD WRONG analysis of the article. Let's look at the + and minus' of AGM based on the article:
Spill-proof through acid encapsulation in matting technology
High specific power, low internal resistance, responsive to load
Up to 5 times faster charge than with flooded technology
Better cycle life than with flooded systems
Water retention (oxygen and hydrogen combine to produce water)
Vibration resistance due to sandwich construction
Stands up well to cold temperature
Higher manufacturing cost than flooded (but cheaper than gel)
Sensitive to overcharging (gel has tighter tolerances than AGM)
Capacity has gradual decline (gel has a performance dome)
Low specific energy
Must be stored in charged condition (less critical than flooded)
Not environmentally friendly (has less electrolyte, lead that flooded)
Now lets add negatives....2-3 times the price. Doesn't like HEAT. DOESN'T Like to be continuously left on float. MUST be charged to 100% each time or capacity will be lost. FEWER life cycles than the comparable quality wet cell (Trojan will tell you this on their site and they make and sell both!)
Then lets' review the advantages of AGM as it applies to you.
NO WATERING is a nice benefit.
Spill Proof is of no concern in an upright coach.
Low internal resistance...good for charging IF you have a HUGE charger.
High Current power....good IF you have BIG instantaneous amp loads...you don't.
Better life cycle...an outright falsehood not supported by any battery mfr. ...try to find THAT claim on any battery mfr. site compared to their wet cells. Trojan says the opposite.
Cold temperature performance is better. Do you plan to use the coach in below zero F conditions?
Good vibration resistance...true compared to normal batts...but NOT compared to quality deep cycles like Trojan wet cells.
Don't get me wrong. I lived full time off the grid for 6 years and had an 1100 amp hour AGM bank...because I needed it for instant current drains, had a huge charger (130amps) had an 8kw generator to power the charger and batteries in an inaccessible area for watering with no ventilation.
They were the answer for me.
If you want to buy them...help yourself...they will certainly work. I think you will kill them in short order (2 years or less) given your prior posts and inability to monitor usage, charging, state of charge etc.