Originally Posted by booster
Obviously, very few people drive that long on a regular basis so most batteries don't get full charges from the alternators.
For best battery life, getting to true 100% every 10 cycles or so is needed, but rarely happens in RV use IMO.
Booster is correct.
That has been my experience with lead acid (AGM in my case). Quick bulk charge then takes forever and a day when absorption and float stages kicks in.
High charging rate amps coming in from alternator helps cut time to fully charged state. Maximize the rate if you can without exceeding battery charging capacity.
I had relationship with my local AGM dealer that mainly sold high end AGMs to harbor cruise operators. He did very well for the simple reason that the operators during course of the day did not have time to fully charge their AGMs between excursions. Prematurely replacing very expensive AGMs was cost of doing business. My dealer friend was happy.
As Booster stated, you need to fully charge into float on a regular basis, the more the better for long life.
Never going back to lead acid. With lithium charging is pedal to the metal (all bulk). My campers' alternator charging rate averages 100 amps depending on battery state of charge. No solar installed. On rare occasion will charge on outside power. Inverter set to 100 amp charge rate.