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Your solar / battery provider for sure first up.
They are responsible to do the commissioning / set up part of the install correctly, for the individual site, and also all the compliance stuff with SAPN.
Make sure you are on Flexible Exports, and not Fixed Exports . . . even if you think you've been on Flexible Exports, check . . . I was on that, but into Winter 2024, my system failed it's 6 month small embedded generation (SEG) approval 'test', think something to do with backstop / curtailment feature I think, so was put onto fixed exports until I picked it up into spring 2024.
What you are experiencing sounds like a typical set up for curtailment of feed in once the battery is full.
Does it send to the grid WHILE you battery is charging, or is it the same nothing to the grid at all ??
Usually curtailment once a battery is full is good for wholesale models like Amber, where pricing goes negative for feed in more and more in some states, but for most on retailer plans, you want that extra minuscule FIT becoming credits where you can get it.
Most (some ?) apps have a setting that you can set for export or curtailment, but if you aren't familiar with it, or it's not something you can find, it could be something in the back end of the software that the battery / solar people can fix up for you.
I can't imagine you've been curtailed by SAPN through our fairly poor solar weather through winter / spring right through to now.
I'm in SA too, and SAPN told me the other day that I'm in an area where curtailment (by them) has never happened for me (since Nov 2023), loads of feed in capability, but some areas saturated in solar feed in do get curtailed if / when things exceed network capabilities, so your solar / battery people might need to check with SAPN.
I phoned SAPN the other day and found out within 5 mins, a refreshing change to most corporations.
Good luck, let us know what you find out.
