🔋 New SGIP Battery Sizing Rules for Standalone Storage: What California Homeowners Need to Know in 2025
California’s Self-Generation Incentive Program (SGIP) continues to be one of the best ways to reduce the cost of installing a home battery. But if you're planning to apply for a rebate in 2025, it’s crucial to understand the new sizing rules introduced by the California Public Utilities Commission (CPUC) under Resolution E-5360.
These changes took effect on December 19, 2024, and they significantly impact how large your battery system can be — especially if you're installing standalone storage (a battery not connected to solar panels).
⚖️ What Changed?
Under the new rules:
SGIP now sizes battery systems based on energy (kWh), not power (kW)
The old 10 kW sizing threshold has been replaced by a 15 kWh threshold
If your system is larger than 15 kWh, you must justify the size with actual energy usage data
There is now a 30 kWh cap for all systems applying through the residential equity budget
📐 How to Justify Standalone Battery Size
If you're installing a standalone battery and want a system larger than 15 kWh, here's what you need:
You must use:
The average daily energy consumption from 4 PM to 9 PM
during a summer calendar month (June, July, or August)
This specific 4–9 PM window aligns with California’s peak demand period, when the grid is most stressed and energy is most expensive. SGIP wants to ensure batteries are used during these hours.
🧠 Example:
Let’s say you're applying in July 2025 and you provide usage data from June 2025.
Your utility data shows that during June, your household used an average of 15.6 kWh per day between 4–9 PM
Based on this, you’re eligible to install a battery up to 15.6 kWh in capacity
If you wanted to install two Tesla Powerwalls (which total 27 kWh), you’d need to prove your average usage during that time window was at least 27 kWh/day
⚠️ If you don’t have enough usage to justify the size, SGIP will not approve your rebate for the full system.
🚫 Residential Cap: 30 kWh Max
Even if your data supports a larger system, SGIP limits residential equity projects to a maximum of 30 kWh.
✅ When No Justification is Needed
If your standalone battery system is 15 kWh or less, you don’t need to submit any usage data at all. This makes one Tesla Powerwall (13.5 kWh) an easy choice for many homeowners who want to skip the paperwork.
🧾 What You’ll Need to Apply
Interval usage data from your utility (typically Green Button format)
A simple calculation of your average daily 4–9 PM energy use during a summer month
A sizing worksheet or justification form (varies by program administrator)
💡 Should You Pair Storage With Solar?
If you're having trouble justifying a larger standalone battery, you might consider pairing it with solar. Paired systems follow different rules — sizing is based on excess solar production, not your load. That can sometimes allow for larger batteries (we'll cover this in a separate post).
🏡 Bottom Line
If you're planning to install a standalone battery system in California and apply for the SGIP rebate, make sure you:
Understand your 4–9 PM summer usage
Stay below the 30 kWh cap
Use June, July, or August data to justify your system if it’s over 15 kWh
Have questions about your usage data or whether your home qualifies for SGIP? We can help you analyze your numbers and design a right-sized system that qualifies for incentives.
Need help with your SGIP application or battery sizing? Reach out to our team — we’re here to make the process simple. CALL US AT 510-559-7700 or email nsaglam@allyelectricandsolar.com
Revolutionizing Home Energy with FranklinWH's Generator Module and V2L Technology
In today's world, ensuring reliable home energy is more crucial than ever. At Ally Electric and Solar, we are dedicated to offering our customers the most innovative and robust energy storage solutions. That's why we're incredibly excited to highlight FranklinWH and their cutting-edge technologies designed to enhance home energy resilience.
FranklinWH is leading the charge in home energy innovation, particularly with their Generator Module and Vehicle-to-Load (V2L) technology. These features are not just add-ons—they represent a fundamental shift in how we think about home energy security. By allowing multiple energy sources to integrate seamlessly into the FranklinWH system, homeowners gain unprecedented flexibility and reliability, especially during power outages.
What Makes FranklinWH Stand Out?
FranklinWH distinguishes itself by focusing on multi-source energy integration. Here's how:
Generator Module: This module enables homeowners to integrate fuel-powered generators and even electric vehicles (EVs) directly into their home energy system. This ensures uninterrupted power, as you can seamlessly switch between grid power, battery storage, and generator power.
Vehicle-to-Load (V2L) Technology: With V2L, your electric vehicle transforms into a mobile power source. During an outage, your EV can provide backup power to your home, effectively extending your energy reserves.
These technologies work together to create a highly resilient energy ecosystem. Instead of relying solely on the grid or a single backup source, FranklinWH's system supports a diversified approach, enhancing reliability and efficiency.
Call us to find out more:
How the Generator Module allows homeowners to integrate fuel-powered generators and EVs for uninterrupted power.
The benefits of V2L technology, enabling EVs to serve as a backup power source during outages.
How FranklinWH’s system supports multi-source energy integration for enhanced reliability and efficiency.
At Ally Electric and Solar, we are excited to partner with FranklinWH to bring these innovative energy storage solutions to your home. Whether you're looking to enhance your energy independence or ensure reliable backup power, FranklinWH's technology offers the future of home energy resilience.
Stay connected with us for more updates on FranklinWH and how we can help you power your home's future!
Unlock Your Solar Potential with Certified REC Solar Professional Installers: Choose Ally Electric & Solar
Embrace a brighter, more sustainable future with solar energy. At Ally Electric & Solar, we empower homeowners and businesses to harness the sun's power through expert installation of high-performance REC solar panels. As your trusted local solar installers & electrical contractors, our team of Certified REC Solar Professional installers ensures a seamless transition to clean, cost-effective energy.
Investing in solar is a significant step, and the quality of installation is paramount to maximizing your system's efficiency and longevity. That's why choosing certified professional installers of REC Panels is crucial. REC (Renewable Energy Corporation) is a globally recognized leader in solar technology, known for producing high-quality, durable, and efficient solar panels. Partnering with installers certified by REC guarantees that your system is handled by professionals with specialized knowledge and training.
Why Entrust Your Solar Project to REC Certified Solar Professional Installers?
Opting for REC Certified Solar Installers offers numerous advantages:
Specialized Expertise: Certified professional installers of REC Panels undergo rigorous training specifically on REC's products and installation best practices. This ensures they have the in-depth knowledge required for optimal system performance.
Adherence to Standards: As certified professional installers of REC Panels, we follow REC's strict installation guidelines, guaranteeing the quality and longevity of your solar investment.
Maximized Performance: Correct installation by REC certified solar professional installers ensures your REC panels operate at their peak efficiency, maximizing energy generation and savings.
Warranty Assurance: Proper installation by certified professionals often plays a crucial role in maintaining the validity of the REC panel warranties.
Ally Electric & Solar: Your Local Experts in REC Solar Installation
When you choose Ally Electric & Solar, you're selecting a team of dedicated local solar installers committed to excellence. We are proud to be your certified professional installers of rec panels near me, serving your area. Our comprehensive services and commitment to customer satisfaction set us apart:
Certified Professionals: Our team comprises highly trained REC certified solar professional installers who are passionate about delivering top-notch installations.
Tailored Solutions: As experienced local solar installers, we understand the unique energy needs and environmental conditions of our service area. We design customized solar solutions to maximize your energy savings.
End-to-End Service: From initial consultation and system design to professional installation and ongoing support, we manage every aspect of your solar project seamlessly.
Electrical Expertise: Being both local solar installers & electrical contractors, we possess a comprehensive understanding of electrical systems, ensuring safe and efficient integration of your solar array.
Unwavering Commitment: Your satisfaction is our priority. We are dedicated to providing transparent communication, reliable service, and exceptional workmanship.
If you're searching for "REC certified installer near me" or "Rec certified solar professional installer near me," look no further than Ally Electric & Solar. We are your trusted REC solar panel installers, bringing our expertise directly to your home or business. While you might find broader searches like "Certified professional installers of rec panels california," our local focus ensures personalized service and a deep understanding of your specific needs within our service area. We are the Certified REC Solar Professional installers in your area you can rely on.
Understanding the "Rec certified solar professional installer cost" is a key part of your decision-making process. While costs can vary based on system size and complexity, investing in a certified REC Solar Professional installer like Ally Electric & Solar ensures long-term value and minimizes the risk of costly errors or underperforming systems. Our transparent pricing provides you with a clear understanding of your investment. The "Rec certified solar professional installer training" our team undergoes equips them with the specialized skills to handle REC panels expertly, ensuring a high-quality installation that protects your investment for years to come. Choose Ally Electric & Solar, your reliable REC solar-certified installer.
FAQs About REC Solar and Installation:
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REC is a leading global manufacturer of high-quality solar panels known for their efficiency, durability, and aesthetic design.
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Certified REC Solar Professional installers have specific training on REC panels, ensuring optimal performance and warranty validity.
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Search online or contact REC. Ally Electric & Solar is a certified installer.
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Costs vary; contact Ally Electric & Solar for a personalized quote or fill out this form - Free Quote
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Our installers complete comprehensive REC-recognized training.
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We are both, providing comprehensive solar and electrical services.
Ready to Go Solar with Confidence?
Partner with Ally Electric & Solar, your trusted local solar installers and certified professional installers of REC Panels. Visit our website at www.allyelectricandsolar.com/ or contact us today for a free consultation. Let our team of Certified REC Solar Professional installers guide you.