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A bit OTT tbh unless its fluctuating alot and the existing circuits are hard to identify and trace... a weigh up on of the existing circuits should be enough to guess if your measured reading is reflective of the nature of the design load.
Edit ... the OP already has the equipment so seems the better option - most don't posses this equipment and could be expensive to hire out.... this round to you dave
It depends how big and complex the installation is, and how accurate you want/need to be.
I am used to balancing generator supplies at festivals/events so am very mindful of maintaining good balance at all times, bearing in mind the nature of loads as well as design currents.
And for small installation some home energy monitors work as reasonable data loggers when high accuracy is not key. I've got 3 OWL transmitters with 200A CTs I picked up on eBay for next to nowt along with a USB receiver to download/monitor the data. They work quite well when my proper power quality analyser is already in use.