Inverter Eskom consumption vs pre- paid meter

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Raffs

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Hi guys,
A little help or understanding please , based on my limited tech knowledge on solar and such , it is my understanding that on the Sunsync inverter the “Buy” column on the screen indicates how much Eskom was consumed , and by my reasoning the usage on the prepaid meter should correlate, is that correct ? Example At midnight I check Eskom usage ,indicates 0 kWh , the pre paid indicates say 100 units when I check the following evening inverter indicates 2 kWh (Eskom) used yet the prepaid meter indicates 89 units availability implying I used 11 kWh for the day , the discrepancy is 9 kWh … am I missing something here….before I call the installer in to check
Thanks guys
 
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