A "Regular battery charger" will read the lithium battery voltage and think that your battery is fully charged.
After reading your post again, I'm thinking that you may have some grounding issue somewhere in your power center or one of the outlets may have the positive and neutral wires crossed. That "might" explain your brother's GFI tripping.
Not sure why your converter is going to 57A. That might be a wiring issue as well. Do you have the "Charge Wizard" on your converter?
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TrailManor Elkmont
640W solar- 230AH LiFeP04 Battery
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