Upgrading converter
Hey folks! I am looking at the BD 1255 MBA 55 Amp 4-Stage Main Board Replacement. I have a WFCO 8955 PEC. I am looking to upgrade to a couple Golf Cart batteries this year and we do a lot of boon ...
Forum Discussion
BFL13 wrote:
When off grid using generator recharge, you do 50-80s or maybe 50-90s with FLA. So it can be that there is little time advantage with LFP---very scenario dependent.
My ugly graph has 55 amps on a 220 AH bank doing a 50-80 reach 72% SOC before amps taper. So most of the 50-80 is at constant 55 amps anyway and would take the same time with LFP--except a small diff in time where the LFP does not take as much heat loss. That heat loss only gets going with the FLA above 80% SOC as noted in the Trimetric's manual wrt charging efficiency assumptions for that monitor's AH counter.
The LFP advantage in time for the same amps is in the zone above 75% say, but the gen will not be running by then anyway. Itinerant1 does more like 35-75s with his LFPs so not much time saving there over FLA times, but he uses his LFPs for other advantages mainly.
3tons hates it when I doubt he saves much time on solar recharging like he claims he gets from no heat loss on recharging. Since solar is such a low charging rate in amps per battery bank capacity, that means the FLA will get to 90% or so before amps taper and gassing starts. If the LFPs are only going to 90% too on solar as is common it seems, they have almost the same times on low amp solar as FLAs
The LFPs can be charged way faster, but "they" forget to mention that means using way more amps and that means you need more of a generator to run the bigger amps charger--not always possible to carry in an RV.
Lots of good reasons for some to choose LFPs but recharging times are not made clear how that works in different scenarios
actualy the LFP advantage is throughout the entire range. its the fact that LFP batteries have less internal resistance than flooded batteries that makes the difference, well there is more to it than just that but that keeps it simple. it may make more difference the fuller the batteries get or the warmer they get but it does make a difference everywhere in the range. I have already noticed a faster charging time from 40% to 70-80% by a significant amount.
