AGM vs Flooded Bulk Times
PT keeps asking whether AGMs will spend more time in Bulk at the same charging rate. I found a good example where that can be measured, using ah64id's test with his PD4655 on his pair of Lifeline...
Forum Discussion
"Oops here's that nasty 50 mph speed limit again. Maybe we can fudge with the clock (?)"
That's just it. Most RVers have chargers that are rated to a certain amps and go to a certain high voltage like 14.6v. Many (most?) are in the 55-60 amps range. Solar with AGMs is even worse for that--solar is low amps, so well below the AGM acceptance right up to high SOCs.
For those RVers, there would be no real AGM speed advantage and generator gas saving doing 50-80s. Their 60a converter size AGM advantage is mostly from say 75-100% SOC where you only do that on shore power or solar, and nobody cares about fast charging for that anyway.
You really have to go out of your way getting very high amp chargers and a big gen to run them to get an AGM speed advantage doing 50-80s.
Even then, to get that high charging rate, you might not have enough battery bank for your daily AH use. Say two AGM 6s. If you get another two so you have enough of a bank, that just cut your charging rate in half--same amps charger-- so now you need more of a charger and a bigger gen to keep your AGM speed advantage.
And how many of those 50-80s do you do in a year, saving an hour of gen time each 50-80, so how much gasoline is that for what cost?
IMO, those who make blanket claims about how much faster AGMs recharge should greatly qualify those claims based on what we seem to have learned here.
There are other good reasons to get AGMs like being able to keep them inside, that have nothing to do with faster charging.
That's just it. Most RVers have chargers that are rated to a certain amps and go to a certain high voltage like 14.6v. Many (most?) are in the 55-60 amps range. Solar with AGMs is even worse for that--solar is low amps, so well below the AGM acceptance right up to high SOCs.
For those RVers, there would be no real AGM speed advantage and generator gas saving doing 50-80s. Their 60a converter size AGM advantage is mostly from say 75-100% SOC where you only do that on shore power or solar, and nobody cares about fast charging for that anyway.
You really have to go out of your way getting very high amp chargers and a big gen to run them to get an AGM speed advantage doing 50-80s.
Even then, to get that high charging rate, you might not have enough battery bank for your daily AH use. Say two AGM 6s. If you get another two so you have enough of a bank, that just cut your charging rate in half--same amps charger-- so now you need more of a charger and a bigger gen to keep your AGM speed advantage.
And how many of those 50-80s do you do in a year, saving an hour of gen time each 50-80, so how much gasoline is that for what cost?
IMO, those who make blanket claims about how much faster AGMs recharge should greatly qualify those claims based on what we seem to have learned here.
There are other good reasons to get AGMs like being able to keep them inside, that have nothing to do with faster charging.
