Electrical Question

IN BULK mode with AGM batteries the answer is "It depends" and frankly on too many things to list.. It might,, I do it in fact. Or it might not. One thing is WILL NOT do is LENGTHEN the recharge time. So your risk factor is zero. Worst case is "no difference"

Absorption mode it should not affet at all.

Thanks for everyone's response. Since everything is working great now, I think I will leave the converter off for now and charge with the inverter/charger. I am looking at adding zamp solar 200 watt portable solar for the summer to compliment the charger.
If the inverter/charger fails, I can always turn on the converter as backup.

I have had good results with using a car charger in addition to the built in charger (which in my case is a rather useless one that will be replaced in the spring), but only to the point where the voltage increases to max when the current limiting is no longer an issue, after that of course there is no benefit and that is a fair portion of the time. You have a fairly large battery, so you may save a worthwhile amount of generator time if your two units can work with each other.
That said both units will not power up at exactly the same time, so unless you are very heavily discharged the battery will appear to be at a higher stage of charge than it is and the voltage setting may be set lower than it should be if the unit senses that higher voltage. Some units can have the voltage forced higher for a period of time, in which case make sure you do that.

Xantrex 1055 manual

Assuming you are on AGM battery charge setting with 14.3 charging and 13.4 float. This seems low but I don't have the specs for Full River AGM. Probably 14.6 to 14.8 volts would be better and can be set using the custom battery option. I might go .1 high on the charge and .1 low on the float (vs spec) while off grid. Then the 9245 when plugged in.

Otherwise yes the 9245 converter together with the 1055 will charge faster.


on edit:
fullriver specs
Looks like 14.7 & 13.7 so I would set the 1055 to 14.8 and 13.6 for off grid.

I am out camping now. The inverter charger is a Xantrex hfs 1055. The converter is a pdi 9245. The batteries are full river 6v 250 amps at 20 hr rate. Thinking about portable solar because mounting solar on roof is not feasible in Texas since we try to always park in the shade.

If you are looking for tip-top 100% charge then yes it takes an extended period from 50%. Although 90% can be usually reached in 2 to 4 hours. You need max on both amps and voltage to win the race. List the specs for all three for best answers.

And since you are in TX have you considered solar? 200 to 500+ watts all day would take care of the long absorption and possibly the bulk.

What are the charging specifications for your AGMs? Some have a 20% charging rate limit so 250AH would be about a 50 amp limit anyway.

If they are Lifeline type you can use more charging amps. In that case your two chargers will add their amps if they are nearly the same voltage getting the batts to their similar Absorption voltage.

Then it is up to their charging "profiles" if they hold that Vabs or drop to a lower voltage right away or after a certain time, which will leave the one doing it all. (but that one might be all the batteries will accept by then anyway.)

So to help with the estimating WAGS, what exactly is this inverter charger you have (link the specs) and what is the converter model?

Of course the generator has to be able to handle the power for both chargers. Can it?

My understanding is that the absorption phase takes what it takes...lots of time...regardless of how much juice you are stuffing into the charger.

You can try it but sometimes they interfere with each other and act oddly.
That's a lot of current though and would really be charging the bank too hard IMHO.