I’ve got a 5kW array of panels so yea, piddly stuff like charging USB is nothing - it’s more the principal of the thing.

My EV charger is definitely the biggie. The system will dynamically adjust charging current in 1A steps to make use of available excess generation. It works pretty well - 16kWh spinning my meter backwards would earn me a whole $1.50 - instead it added ~20% charge to the car.

Naw, I have a super efficient heat pump and my water heater has been on for about ten minutes today. When high demand stuff kicks in my system kills off discretionary loads until I’m not exceeding my production. And this is in Canada…

The blog post is an incredible read.

I’ll make country a mandatory field. Thanks!

I am more than happy to share the calculations - I’m a firm believer in transparency. I’ll update along with your other suggestions. Thanks for the input!