Gringo,
you can download an owners manual for the 458 below:
http://www.newellclassic.com/forum/manuals-datasheets/3054-xantrex-458-freedom-series-inverter-charger-owners-manual.html
I just looked at it and the 458 is an inverter with a built in 3 stage charger so I believe the inverter does not have to be on for the charger to operate.
If I'm incorrect please correct me,
Joseph
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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