I don't agree. First of all, some household appliances can't use 12v electricity directly, such as electric fans. Of course, this is not the most important thing. The important thing is that solar cells can't spread to families yet. The average person in the United States has a car, which shows that cars are popular in the United States, but solar energy is not popular yet. Of course, it is more difficult to promote solar trams. If solar cells are not popular, what is the use of 12V interface? The inverter is only a few hundred dollars, not as expensive as the landlord said. There is also a refrigerator. It seems uneconomical to add another 12V interface, and the landlord's proposal is unrealistic.