Good post. FYI that the Magnum MS2024 is not grid tie, grid tie usually means that the utility power must be available for the inverter to work. You have an 24vdc Inverter/Charger which allows you to have solar and battery backup.
They call it a grid tie because it has a 110 volt AC to DC charger built in so you can plug it in or hook a generator to it to keep batteries charged, yes it has solar and battery input also. For my well I have the MS4024PAE and hook my generator to it with 220 if needed.