Suspected Converter Problem

BFL13 wrote:
Mex often reminds us about Lifeline AGM spec that they want 20% minimum of the AH rating as a bulk charging rate, so you do need to produce that much current, but can't in some RV set-ups.

Other AGM types/brands may or may not require that minimum in their specs, but Mex says to pretend they do and do it anyway.

As to voltage, that is again a spec thing, where some AGMs want 14.4 and others 14.8 or whatever. If yours want 14.8 and your converter does 14.4, too bad. If your wires are too thin, so the converter does 14.8 but the batts only see 14.6 too bad. Especially if the 20% current is high enough for that wire gauge to cause that much voltage drop. By the time amps taper later on and voltage drop goes away, it is too late.

With the 28" wire if it is say #6 in good condition, and 55 amps on 210 AH =26%, you should be ok for all that except if the batts want 14.8

If the batts only ever see 14.4 instead of 14.8 (if needed) then how many years off their life will that cause? One? Anyway you have that other charger you can use for some of the recharges, so that would help (if needed)