Hello @happyAndrew, I can address your question about our readings.
Net (Usage/Production) – this is what you meter is doing depending on home use and solar production.
Total Usage- this is the total use of the home electricity regardless of source, solar or from the utility.
Balance is the energy reported by the Mains (200A sensors) that is not being monitored by the 50A sensors. Balance is calculated by taking the sum of all the usage reported by the 50A sensors and subtracting that value from the total reported by the Mains during the same period.