Dawid1
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It may help to ensure that the external charger or MPPT has voltage settings about 0.1 V less than the inverter's bulk/absorb voltage setting. Otherwise, it can get confused and act strangely. i forget the exact scenario, but I found it worked better than way. I ran an external MPPT for several years, until I upgraded to a second inverter in parallel with the first.
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@Dawid1Yes you can add a external charger. You can also add a extra MPPT to the charge the batteries.