I just looked up the LifeBlue website and they claim they are one of the only LiFePo batteries that don't need a DC-DC charger and don't require solar and converters set to a "Lithium" setting as they are a "true" drop in replacement.Yes, i went through this exact conundrum on my 2020 Ram5500 project.
I special ordered my truck with the Dual Alternators for 440amp total thinking i would separate them, one for truck bats, one for house bats.
I quickly learned this is WAYYYY more complicated than it seems, on the newer trucks.
DISCLAIMER: I am NOT an expert in this field, and wont claim to be. Also, everything i have found out is based on the Ram 6.7 cummins, i have no idea if the Ford alts are setup the same way.
However, i have some friends that are, do this for a living, and even spent a couple hours at my local dealer talking with an OG guy there that loves my project, so gives me a bit more love than the usual customer.
Bottom Line i found out: The dual alternators are controlled by the computer to work together and split the charging (somewhat) and disperse the duties to cut down on heat and other things. If one fails, the other one can pick up the slack as needed until repaired/replaced.
There is a process to electronically remove the second alternator from the computer by deleting the sales code and that essentially has the truck setup as if it came with just a single one from the factory.
Electronically anyway... You still have a complicated array of wiring in the loom for alt 2, and redoing it all to serve a different purpose on a brand new truck just seemed like way too much headache and unnecessary work that may possibly effect warranty.
After lots of research, and going back and forth, i settled on a Sterling 60amp B2B and so far, it has been working flawlessly throughout all the crazy tests i've been putting it through. My Victron smart shunt, shows the Sterling is actually charging at the 60amps it claims as well.
This is all for a 300ah lithium LifeBlue battery. So far, its been great for all my needs (my entire truck is setup for everything electric and no propane). But now that summer is coming, and i will be running the AC a bit more, i will be keeping an eye on the usage and determine if i need more battery.
A friend of a friend runs a residential Solar company and builds his version of Tesla Walls and he's been yapping about building me a big silly battery bank for the camper. If i end up doing that, i will likely switch to the Sterling 120b2b and then i'd basically be setup for whatever i could possibly throw at it.
End of the day, B2B are simple to install, setup, and work great
Careful with the Victron and RedArc versions folks are using, for what they cost they arent available in higher outputs.
There is absolutely no reason you shouldnt put the biggest one you can fit on your setup. I believe the Victron and RedArc max out at 30 or 40amps or so.
Sterlings are available up to 120amps, its kind of a no brainer (i went with their 60amp at the time of my build because the 120amp version was on backorder forever, its available now)
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I've used Sterling B2B chargers with another brand of Lithium battery and it worked great. However, LifeBlue doesn't require them and allows direct alternator charging that worth considering. Maybe this is only in their current BMS versions. I don't think it would hurt if the Sterling was installed too, but it may be unnecessary. Do you have any insights?