Overview
California will allow up to 1,200W installations, but panels must be certified by an outside safety organization.
California has joined nine other US states in approving plug-in solar installations, more commonly known as balcony solar. The Plug and Play Solar Act was passed with overwhelming bipartisan support and signed into law by governor Gavin Newsom on September 30th. The law goes into force on January 1, 2027.
Hardware and Setup
Balcony solar kits consist of at least one solar panel and a microinverter to convert DC to 120V AC power, along with a battery backup for those who want power in the evening. They are relatively inexpensive compared to regular rooftop installations as they can be self-installed and usually plugged into a standard AC socket.
You won't need to register a plug-in solar system with utilities as is required for rooftop installations. The new process will be relatively simple and free, with immediate approvals.
Safety and Regulations
Installations are limited to 1,200W, which is much less than a rooftop installation. That number is in line with most other states but less than the 1,920 W maximum allowed in Colorado. California's law also requires UL or equivalent certification, and there is just one of those standards for plug-in solar so far.
The defining feature of the UL3700 standard is the requirement for a uniquely configured, non-NEMA plug and receptacle system. This would require the intervention of a certified electrician for many installations and make it impractical for some renters.
Market Availability
There are currently just a handful of products certified under UL3700 from manufacturers like Hoymiles, APsystems and Mango. A nonprofit that sponsored the bill expects approval for two more companies by the end of the year, with products reaching shelves in 2027.
Large state utilities opposed the bill, citing safety concerns and potential price impacts that could pass extra costs onto users without a solar power option.
