Joshua Weiner, CEO of SepiSolar, provides expert witness and case review services for construction law and civil litigation firms representing plaintiffs and defense. Weiner can support discovery, analysis, and fact-finding for projects that result of a financial loss, technical failure, or contractual claim.
As a solar energy expert witness, Weiner brings knowledge of law, policy, technology, contracts, finance, permits and entitlements, project development and construction, data acquisition and analysis that commonly apply to renewable energy and distributed energy projects.
Specific areas of expertise, listed below, include energy technologies, markets, policy, finance, project development, planning and execution, project management, and codes and standards.
Since 2007, Weiner is a certified member of the North American Board of Certified Energy Practitioners (NABCEP) in good standing. Weiner has also taught advanced solar system design and project management at UC Berkeley.
Josh Weiner, Solar Expert Witness
Areas of Expertise
Batteries & Energy Storage
Commercial & Industrial
Net Energy Metering (NEM)
Incentive Programs & Structures
Financing Programs & Structures
Performance Modeling & Simulation
Project Planning & Execution
Sales Proposals, Pro Formas & Cash Flow Statements
System Design & Architecture
Control Strategies & Microgrid Operations
Technology Due Diligence
Product & Vendor Selection
Product Warranties, Guarantees & Liabilities
Operations & Maintenance
Data Acquisition & Monitoring
Codes & Standards
Health & Safety
National Electrical Code
Industry Codes & Standards
Solar Rights Act
In addition to consulting for NEXTracker, NRG Home Solar, and Green Charge Networks (now, ENGIE Storage), the below is a summary of Weiner’s expert witness experience.
Reviewed disputes and claims between project owners and Engineering, Procurement, and Construction (EPC) design-build companies involving contract, project, and construction documents as well as monitoring and performance data
Performed discovery and analysis (financial, technical, regulatory) to identify complex issues, then translating and articulating them in relatively simple terms
Performed project site visits and inspections to verify and analyze system health, performance, construction defects, regulatory compliance, contractual compliance, and utility interconnection compliance
Weiner’s professional experience includes engineering and design for
1,000+ residential systems (5+ MW overall)
200+ commercial, industrial, agricultural systems (50+ MW overall)
12+ utility-scale systems (70+ MW overall)
15+ utility-interactive energy storage systems (8+ MWh overall)
BA in Astrophysics (minors in Physics & Music),
Awards and Affiliation
certification (2007 – present)
member (2016 – present)
awarded for Load Isolation Consumption Management Systems and Methods (US 20130285446 A1)
To get in touch with our Solar Energy Expert Witness: