Can An Alternator Draw A Battery Down
- #2
Because alternators are designed to work with lead acid and there are a number of problems when connecting a lithium battery business firm battery directly it seems the best option is instead to utilize a DC to DC charger
A properly set dc to dc charger from the starter battery/alternator to lithium house bombardment volition control the load on the alternator and make sure the lithium house bombardment recieves the correct voltage to fully charge it
boondox
Chief Engineer, RedNeckTech Industries
- #3
Role of this depends on what size alternator you accept. In my van I used a fifty amp DC to DC charger. That limits how much I pull from the alternator. It also depends on your use profile. IN my case I want to exist able to idle some in place and charge. Pulling besides much off an alternator at idle volition overheat information technology for sure. Every bit well, stock alternators do not have the correct charge profile for lithium. So you really demand a charge controller i the eye.
Zil
Just another ass on the web
- #half dozen
As @ianganderton said a dc2dc charger is highly recommended.
The idea that a lifepo4 bombardment is a driblet in replacement isn't absolutely correct.
A lifepo4 bombardment tin draw plenty charge to hurt itself just more likely it volition injure your alternator beginning.
The other important thing to consider is your bms is not intended to be used for accuse termination.
Its to be used equally a "reserve parachute" to continue your lifepo4 bombardment from being harmed.
A typical BMS won't disconnnect from the charge source untils > 3.65 volts per cell.
- #8
Have y'all run across the Victron video where they bear witness the issues with lithium pulling loftier loads on the alternator and causing over heating?
Not certain if battle born take measured that protect against thins in their bms
- #nine
Have you lot run into the Victron video where they show the problems with lithium pulling loftier loads on the alternator and causing over heating?
Not certain if battle born have measured that protect against thins in their bms
Your alternator is not battleborn's business.
- #11
No but Battle Born do seem to exist a good engineering science visitor that would want to provide Problem gratuitous products that customers Are happy with
Client satisfaction is something that battleborn are concerned with and called-for alternators might not be skilful for that 
- #13
Moving to only solar charging is 1 of the best solutions if you are using the system in an surroundings where that'due south possible.
E.g someone using their camper as a base of operations for skiing may struggle with solar merely
The renolgy mppt and dc charger combining solar and alternator charging is a good pick
DCC50S 12V 50A DC-DC On-Board Battery Charger with MPPT
Make sure your service battery has all the juice it needs with Renogy's DCC50S DC-DC MPPT On-Board Battery Charger. Stay fully charged when you're off grid with solar panels connected direct to the unit of measurement, or past attaching it to an alternator. Society yours today.
Kisae have versions too
- #14
No but Boxing Born practise seem to exist a expert engineering science company that would desire to provide Problem complimentary products that customers Are happy with
Customer satisfaction is something that battleborn are concerned with and burning alternators might not be good for that
Let me know how that works out for ya. 
- #15
Let me know how that works out for ya.
Won't affair to me, my arrangement volition never put that trouble in place. 
Plus I'll make my ain batteries for a fraction of the cost of drop ins
boondox
Master Engineer, RedNeckTech Industries
- #16
Greetings and thanks for the useful advice. The ability of a Lithium based replacement for the business firm battery could indeed draw a lot of current if the battery pack is down say 60 amp hours afterwards running the12 volt fridge for say three or 4 cloudy days.
Then far the car is "stock" likely a 50 amp hour alternator. SO... Do y'all have any suggestions for a voltage accuse controller the I might put in the middle.
A programme B for me, could be to just remove the charging wire to the house bombardment, effectively isolating a new Lithium battery for house apply, to the 160 watt moveable solar console on the camper roof. That would leave the alternator circuit to the starter bombardment equally a "stock" manufactory system.
Help with either issue is appreciated.
For starters, replace the 50 amp alt with as big a one equally you can fit. In my case I have 150 amp alt so I figured 50 amps of charge would be OK. Never forget that there are vehicle loads and that you want a practiced corporeality of margin in your alt rating. I figured 50 amps for the house batts, l amps for the vehicle and 50 for overhead. Once you accept decided what you think the charge rate should be, And then look around at the various chargers and find one that will suit your needs.
While you can do some solar as you lot outline, you accept to take a way to charge when the sunday don't polish.
grizzzman
Some say "Why" and some say "Why not?"
- #17
There are other ways that are cheaper/constructive. Look into a Hybrid system. Wait below.
- #18
I regularly install lithium batteries for my customers and am a Battleborn dealer. I will not practice a straight pb acid to lithium swap out with an alternator tie in anymore. There is a high probability of called-for upwardly your battery isolation device and/or alternator. DC-DC chargers are the way to go.
- #20
For trailers I run a dissever power and ground line and effort to use Victron products. Anderson powerpole connectors are very nice for this application. The Victron products have adjustable turn on/off voltage set-points. This avoids running a split up ignition wire to plow on/off the DC-DC charger or installing an automatic charging relay.
I typically only utilize the Renogy products in vans and motorhomes because the ignition wire point is easily accessible.
Source: https://diysolarforum.com/threads/lifepo4-and-auto-alternator-concerns.9521/
Posted by: daviswallard1976.blogspot.com
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