IMHO, using the vehicle engine to re-charge a 600 amp-hour battery bank (regardless of its chemistry) while PARKED is not a good plan ! If you are charging at capacity divided by 20 (C20), a common rate, would be 30A. For a LiFePO4 600 AH battery bank, which can be discharged to near 0% SOC, that would take 20 hr to recharge. For a lead acid battery bank, which should not be discharged past 50%, it would still take 10 hrs.
First, solar is you friend. Not cheap but silent and it works whenever the sun is shining.
Second, high current (50A ?) fully automatic chargers are not common.
Third, automotive alternators do a poor job of charging deep discharge batteries, irregardless of the chemistry. They are not "smart" enough by themselves. Read this
DC-DC battery chargingForth, if it was me, I would take a multi-prong "attack" at your problem.
• Use a DC-DC battery charger while driving.
•Us e a small (< 3000W) portable gasoline/diesel generator for bulk recharging when no shore power is available.
•Use a 100A 12V power supply and timer for "bulk" recharging (a pair of
MegaWatt S-700 would work. The mechanical timer is very important. If that power is applied for too long you will ruin the battery bank.
• Follow up with a "smart" multi-stage battery charger.
ORUse a CTEK D250SA in combination with a CTEK SMARTPASS 120 from the engine alternator. This of course does mean the vehicle engine will have run for many hours when boondocking.
Regardless of what you decide to do, make sure your battery bank charging system will provide the correct voltages and current to your batteries if you want then to live a long life !
