BFL13 wrote:
time2roll has often suggested swapping your 55 amp for a 35 amp if you have 220AH so the spike will be less, with a chance of getting under the 13.2v trigger on start-up. Or add two more batteries.
Even this is not a slam dunk. I have the 35amp WFCO and 4x GC2 batteries connected with #2 wire.
I don't use the converter much even if plugged in. Solar has been good.
I also recommend going smaller with the PowerMax if you can. PowerMax does not hold absorption voltage very long so an oversize converter will drop down to a trickle at about 75% charged.