CATAPULT: "California Title 24 Advanced Power Utilization Technology"
In 2022 the project validated software functionality, equipment assembly and factory testing is in progress.
BoxPower Inc.
Recipient
Grass Valley, CA
Recipient Location
1st
Senate District
1st
Assembly District
$685,209
Amount Spent
Active
Project Status
Project Update
In 2025, three residential installs associated with the demonstration portfolio were completed. The six completed install sites have been “brought live” in the software tool and have been used to perform initial monitoring and testing. In 2026, BoxPower will complete the installation of the remaining 10 sites and begin the formal 1-year measurement and verification (M&V) period.
The Issue
Title 24 building standards require solar on new residential construction, paving the way for even greater solar deployment in California. At the same time, wildfires and public safety power shutoffs are creating greater interest in residential energy storage systems. There is a need to identify how solar-plus-storage systems can provide value to homeowners and how these systems can also provide grid value. Title 24 Joint Appendix 12 specifies operational modes for solar-plus-storage systems however there is a lack of real word performance data. This project will support commercialization of a compliant solar-plus-storage product, gather data on the best approaches for implementing controls, and may inform future changes to Title 24 standards.
Project Innovation
This project will advance and demonstrate a modular, containerized solar-plus-storage system at fifteen residential customer sites across California. The project will demonstrate the system performance as an integrated hardware and software platform that is Title 24 compliant with the ability to provide behind the meter customer energy cost savings, emissions savings, grid services, and customer resiliency during utility power outages. The data obtained on capital cost, operating cost, performance, and lessons learned will support future commercial deployments.
Project Goals
Project Benefits
This project seeks to benefit customers and California ratepayers by investigating a JA12 compliant hardware and software system that offers greater control, economic, and resiliency benefits to customers investing in residential solar-plus-storage systems. The systems installed can limit export to distribution feeders, increasing available hosting capacity on distribution feeders while coordinating storage charging and discharging to help maximize self-consumption and minimize greenhouse gas emissions. Several of the project demonstration sites are located in tribal communities.
Affordability
This project will demonstrate the solar –plus-storage system and validate customer energy bill cost savings. The cost and performance data collected through this demonstration project will advance the technology readiness and support commercialization.
Reliability
This project will demonstrate solar –plus-storage system in residential behind-the-meter applications that can provide resilience benefits to customers in the event of grid outages while limiting export onto distribution feeders.
Consumer Appeal
The technology demonstrated comes in an integrated package that offers greater control and flexibility to customers beyond other commercially available control options for solar-plus-storage systems.
Key Project Members
