This seems to be a different issue. If you are not able to charge your battery to full with 4300w PV during a normal day it is time to look into your overall loading situation and possibly examine if there is a battery issue.
Your battery bank is 300ah at 25vDC giving you ~7500wh worth of power of which a usable amount of about 80% => 6,000wh
Your stated load is 500w average (I do not know if you included the AIO's idle draw of ~50w). Over a day that is 12,000wh. Understand that during night you have no PV production so the battery must carry the load.
With 4300w PV and a typical 5 hours of insolation gives 21,500wh/day.
There are some conversion losses to account for but that is the basic picture. Based on this you should have no problem charging your batteries if they are not faulty but you do have a problem with sufficient battery capacity (6000wh). Starting the nighttime at say 7pm and ending it at 8am gives 13 hours at 500w per hour average load or 6500wh. This means you likely are at low voltage cutoff or have transferred to utility bypass (setting #4) on your AIO.