Yes 30 kWh battery is considered large. It takes up a full 6 slot 2u rack in my garage and cost around $8k. In the context of OP's goals it's larger than what 99% of people in the world will ever have.

Approximately 1% of people in the world currently have an EV with a more than 30 kWh battery... and we're very early in the adoption curve of EVs and other large batteries.