The answer to 'what size electrical meter do I need' is that the size of the electrical meter you need depends on the electrical service to your home. Most single-family homes in the U.S. have a 200-amp electrical service, which requires a 200-amp electric meter. However, some older homes or larger properties may have 100-amp or 400-amp service, which would need a meter sized accordingly.
The electrical meter is the device that measures the electricity usage in your home and is connected to your home's main electrical panel. It's important to ensure you have the right size meter to handle the electrical load of your property. If you're unsure of your home's electrical service size, you can check your main electrical panel or consult with a licensed electrician who can assess your needs.