If you’ve got a 3–4 bedroom house and you’re adding battery storage to solar (or planning to), the “best” battery size usually comes down to one thing: How many kWh you want to cover from late afternoon through the night. Most 3–4 bed homes land in a sweet spot where the battery is big enough to soak up spare solar and run the house in the evening, but not so big that you’ve paid for capacity you rarely fill. Battery unit installed in a residential garage, showing compact design and wiring...