Forum Discussion
BFL13
Jan 13, 2021Explorer II
"With my current RV the two Lithionics 125AH can be at 50% SOC and brought back to 100% SOC in an hour with the Onan generator running versus 3-4 hours with the lead acid batteries at the same SOC level."
Some numbers to play with! :)
That means you can restore 125AH in an hour which means you have a 125 amp charger. Also that the batts get to 100 with no tapering. The Onan gen can run the 125 amp charger.
You would be charging at a 50% charging rate, per LFP specs.
Actually the lead acid batts would take much longer to reach 100% than 3-4 hours. 250AH bank of FLA batts will take a 30% charging rate, so more like 75 amps. In that case from 50% it would take about 30 minutes to get to 65% SOC at 75 amps when amps would then taper for about a 100 minutes to reach 90% SOC
So call it two hours to restore 100 AH (40% of 250) vs an hour to do 125
( about 2 x not 4 x+ in this case.)
It will take maybe 12 hours more to get the FLAs from 90 to 100% so not done on generator.
The claim that LFP are faster charging is true if you have a charger that can do the high amps and a gen with enough VA to run that big charger.
Some numbers to play with! :)
That means you can restore 125AH in an hour which means you have a 125 amp charger. Also that the batts get to 100 with no tapering. The Onan gen can run the 125 amp charger.
You would be charging at a 50% charging rate, per LFP specs.
Actually the lead acid batts would take much longer to reach 100% than 3-4 hours. 250AH bank of FLA batts will take a 30% charging rate, so more like 75 amps. In that case from 50% it would take about 30 minutes to get to 65% SOC at 75 amps when amps would then taper for about a 100 minutes to reach 90% SOC
So call it two hours to restore 100 AH (40% of 250) vs an hour to do 125
( about 2 x not 4 x+ in this case.)
It will take maybe 12 hours more to get the FLAs from 90 to 100% so not done on generator.
The claim that LFP are faster charging is true if you have a charger that can do the high amps and a gen with enough VA to run that big charger.
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