Bulk import

Hi

I need to import historic data and is based on kwh usage pr. hour.

How can I import days*hour x days? - and can it be posted in one go, or do I have to post each hours individually?

data:

day/month/year xxx (epocs is fine)

01/01/2020 01 kwh
01/01/2020 02 kwh
01/01/2020 03 kwh



01/01/2020 23 kwh
01/02/2020 01 kwh

and son on

Thanks

Thanks