Quote Originally Posted by jff45 View Post
I've been running a Renogy 50 amp DCDC for a while now and they have a quirk that's not in the manual. If you're charging via the alternator and the solar at the same time, each circuit is limited to 25 amps even if the solar is only dribbling say 5 amps in while driving. This restricts the alternator side to 25 amps.
I've fitted a relay that opens the solar feed circuit when engine is running so the DCDC can output 50 amps using the alternator.
Thanks John, thats interesting for sure, the system always worked fine with the AGM setup. I have bought the new units that will ensure I get the full 100amps now. I have contacted ITECH and they have steered me towards a troubleshooting table before returning the battery that I am sure I will find is faulty - checked just now and the system capacity is sitting at 71% yet float volts still at 13.37 - just dont understand this. Also, this was the first real stationary camping trip where the car sat for 4 days with minimal alternator starts, and the whole Volts V capacity profile was very different to the AGM setup - might just take me a bit to get used to it. Anyway today the bank gets de-coupled into single batteries and the individual charge process begins, with luck the faulty one becomes clear and does not need the entire 4 batteries to travel from Melb/Perth return.