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10/23/3035
How to Prepare Your Home Electrical System for an EV Charger
Electric vehicles (EVs) are no longer the future — they’re the present. Whether you drive a Tesla, Rivian, or Chevy Bolt, charging your car at home is the most convenient and cost-effective way to stay powered.
But before you schedule an installation, it’s important to make sure your home’s electrical system can safely handle the extra load. Installing a Level 2 charger (the most common residential choice) requires more than just an outlet — it often needs a dedicated circuit, permit approval, and sometimes a main panel upgrade.
Here’s what every Bay Area homeowner should know before adding an EV charger.
Step 1: Check Your Electrical Panel Capacity
Your electrical panel — also called your main service panel — is the control center for your home’s power. It distributes electricity to all your appliances, outlets, and lighting circuits.
Most modern EV chargers draw between 30 and 50 amps of continuous power. If your home has a 100-amp panel, that’s often not enough to safely support an additional circuit for a Level 2 charger.
Look inside your panel:
If it’s labeled 100A, you may need a 200A main panel upgrade.
If you see an older brand like Federal Pacific or Zinsco, it’s likely time for replacement regardless of charger installation.
At Ally Electric & Solar, our licensed electricians perform a load calculation to determine if your home’s system can handle the added demand.
Step 2: Choose the Right Charger Type
There are two primary residential charger types:
Charger LevelVoltageTypical Charging SpeedCircuit RequiredLevel 1 120V (standard outlet)3–5 miles of range per hourNone (uses standard plug)Level 2 240V (dedicated circuit)25–40 miles of range per hour40A–60A breaker
For daily convenience and faster charging, most homeowners opt for Level 2 chargers — such as the Tesla Wall Connector, ChargePoint Home Flex, or Emporia EV Charger.
These require professional installation and a dedicated 240V circuit, which must comply with California Electrical Code and PG&E interconnection standards.
Step 3: Verify Permitting and Utility Requirements
Installing an EV charger isn’t just about plugging in — it’s an electrical upgrade that requires city permitting and sometimes coordination with PG&E.
Your installer will handle the permit application, inspection scheduling, and PG&E notification (if applicable).
At Ally, we include these services in every installation — ensuring your system passes inspection and qualifies for rebates such as:
PG&E EV Charge Rebate
California Clean Vehicle Rebate (CVRP)
These incentives can help offset installation costs for qualified homeowners.
Step 4: Plan for Future Energy Upgrades
If you’re considering solar panels or a home battery system in the future, it’s smart to plan your EV charger installation with expansion in mind.
A properly sized 200-amp main service panel not only supports your EV charger but also prepares your home for:
Solar PV system integration
Battery backup (e.g., Tesla Powerwall, Enphase IQ Battery, FranklinWH)
Heat pump or induction appliances
By upgrading once, you avoid costly rework later — making your home fully “electrification-ready.”
Step 5: Schedule a Professional Inspection
Before installation, a licensed electrician should evaluate:
Your panel’s amperage rating and available breaker space
Wiring condition and grounding
Distance between the panel and the parking area
Site feasibility for conduit and charger placement
Ally Electric & Solar provides a home inspection to assess all of the above. Once your system is approved, we handle the installation, permitting, and setup — so you can start charging confidently.
Power Your Drive with Ally Electric & Solar
Installing an EV charger is one of the best upgrades you can make for convenience, sustainability, and long-term savings.
At Ally Electric & Solar, we specialize in EV charger installations, main panel upgrades, and solar + battery systems across the Bay Area. Our team handles every step — design, permitting, installation, and PG&E coordination — ensuring your home is safe, efficient, and ready for the road ahead.
Schedule Your Free EV Charger Consultation
Ally Electric & Solar, Inc.
California Licensed Electrical Contractor — License #806465
Serving the Greater San Francisco Bay Area
info@allyelectricandsolar.com
(510) 559-7990
www.allyelectricandsolar.com
Book your free EV charger inspection today and we’ll help you choose the right charger, verify your electrical capacity, and provide a no-obligation quote.
10/02/2025
PG&E NEM 3.0 and Solar Batteries: How California Homeowners Can Maximize Savings in 2025
If you live in Northern California, you’ve probably heard of PG&E’s NEM 3.0 program and the changes it brought to solar customers in 2023. Many homeowners are now asking the same question: Is solar still worth it in 2025?
The short answer is yes — but the way you design your system matters more than ever. Under NEM 3.0, solar plus a battery is the winning combination for lowering bills, improving energy independence, and protecting your home during outages.
In this guide, we’ll break down what changed, how it affects your PG&E bill, and why batteries like the Tesla Powerwall 3, Enphase IQ 10C, and FranklinWH aPower are becoming essential for California homeowners.
What Changed Under PG&E’s NEM 3.0?
Under the previous program (NEM 2.0), homeowners earned near-retail credit for each kilowatt-hour they exported back to the grid. That meant solar panels alone could dramatically cut electricity bills — even without a battery.
With NEM 3.0, the value of exported electricity has been reduced by roughly 75% on average. Instead of being credited at close to the retail rate, exported power is compensated at the “avoided cost” rate, which is based on wholesale electricity prices.
Daytime exports (midday) are worth much less.
Evening energy (4 p.m. – 9 p.m.) is expensive, and that’s when solar panels aren’t producing.
This shift makes it harder to save money with solar panels alone, because you’re sending energy to the grid when it’s cheap and buying energy back when it’s expensive.
Why Batteries Are the Key to Savings
The new rules change the math — but they also highlight the value of solar battery storage. A battery allows you to:
Store excess solar power during the day.
Use it in the evening when PG&E’s rates are highest.
Reduce exports at low daytime rates.
Cut peak demand charges.
In other words, batteries help you keep more of the energy you generate, shifting your savings from export value to self-consumption value.
Even better: batteries provide backup power during blackouts — something many Bay Area homeowners worry about, especially after recent wildfire seasons and earthquakes.
Incentives in 2025: ITC + SGIP
The cost of adding a battery has dropped significantly thanks to federal and state incentives.
Federal Tax Credit (ITC):
The 30% credit applies to solar and batteries through at least 2032.
Stand-alone batteries also qualify (even if you already have solar).
California SGIP (Self-Generation Incentive Program):
Rebates are still available in 2025, especially for homes in fire-threat or outage-prone areas.
Typical savings: $2,000–$5,000 per battery.
Together, these incentives can cut the upfront price of a battery system by 30–40%, making it a financially smart move under NEM 3.0.
Real-World Example: Bay Area Home
Let’s look at a simple case study.
System size: 7 kW solar + 10 kWh battery
Without battery: Home exports most power at midday when rates are low. Monthly bill reduction: ~40%.
With battery: Stored energy offsets evening rates (often $0.40–$0.50/kWh). Monthly bill reduction: ~65–70%.
Over a 10-year span, the homeowner saves thousands more by adding a battery. And during PG&E outages, the battery provides reliable backup for lights, refrigeration, internet, and even essential medical devices.
Choosing the Right Battery: Tesla, Enphase, or FranklinWH?
At Ally Electric & Solar, we install several top battery brands. Each has strengths depending on your home’s needs.
Tesla Powerwall 3
High capacity (~13.5 kWh per unit).
Built for whole-home backup.
Sleek design, widely recognized.
Enphase IQ Battery 10C
Modular — you can add units over time.
Works seamlessly with Enphase microinverters.
Good option for homes starting with a smaller system.
FranklinWH aPower + aGate
Strong load management features.
Robust warranty and growing popularity in California.
Flexible for both new installs and retrofits.
Which is best? It depends on your household usage, backup needs, and budget. Our team helps homeowners compare options with clear side-by-side analysis.
Beyond Savings: Energy Independence and Resilience
While much of the NEM 3.0 discussion is about dollars and cents, the bigger picture is energy independence.
Batteries make you less dependent on PG&E’s shifting rate structures.
You gain peace of mind during outages — whether from wildfires, storms, or earthquakes.
Electrification trends (EVs, heat pumps, induction stoves) mean households will rely even more on electricity. Pairing solar with storage ensures you’re ready for that future.
Final Thoughts
PG&E’s NEM 3.0 has changed the landscape, but it hasn’t made solar a bad investment. It’s simply shifted the smart strategy from solar alone to solar plus battery storage.
With the 30% federal tax credit and SGIP rebates still in place, 2025 is an excellent year to invest. By adding storage, you can:
Maximize bill savings.
Gain resilience during outages.
Future-proof your home for the electrification era.
Call to Action
At Ally Electric & Solar, we specialize in designing solar + battery systems tailored to California homes. Whether you’re considering the Tesla Powerwall 3, Enphase IQ 10C, or FranklinWH aPower, our team can help you choose the right solution for your budget and lifestyle.
Contact us today for a free consultation and see how much you can save under PG&E’s new rules.
9/30/2025
Heat Pumps and Solar PV + Energy Storage: Are They a Good Match?
In recent years, homeowners across California and beyond have been exploring how to cut energy costs and reduce carbon emissions. Two technologies often come up in the same conversation: heat pumps and solar photovoltaic (PV) systems with energy storage (ESS). But how do these solutions relate, and is combining them really the right move for every household?
What Are Heat Pumps?
A heat pump is an electric appliance that can both heat and cool a home by transferring heat rather than generating it directly.
Heating mode: extracts heat from the outside air (even in cold weather) and moves it indoors.
Cooling mode: works like an air conditioner, removing heat from indoors and releasing it outdoors.
Because they move heat instead of producing it, heat pumps can achieve efficiencies of 200%–400%, compared to around 90% efficiency for electric resistance heaters or gas furnaces.
How Much Electricity Do Heat Pumps Use?
Electricity consumption depends on:
System size (measured in tons or BTUs).
Climate zone (mild Bay Area vs. colder mountain regions).
Home insulation and ducting.
On average:
A typical residential heat pump uses 2,000 to 4,000 kWh per year for heating and cooling.
That translates to 15%–30% of a household’s total annual electricity use in California.
In colder climates, usage can be higher, especially if backup resistance heating is needed.
For comparison, the average California household consumes about 6,500–7,000 kWh annually (without electric vehicles or large electrification loads). Adding a heat pump can increase that number by 25%–50%, depending on usage.
Why Pair Heat Pumps With Solar + ESS?
Offset Higher Electricity Demand
Without solar, switching from gas heating to a heat pump can cause a noticeable jump in your electric bill.
A properly sized solar PV system can offset most or all of the added consumption.
Take Advantage of Efficiency
Heat pumps are already efficient compared to gas furnaces or electric resistance heating.
Running them on solar power makes heating and cooling nearly emissions-free.
Resiliency With Storage
Energy storage systems (like Tesla Powerwall or Enphase IQ Battery) allow homes to keep heating or cooling during outages.
In California, where blackouts and Public Safety Power Shutoffs (PSPS) are a concern, this adds peace of mind.
Peak Shaving
Many utilities have time-of-use (TOU) rates, with higher costs in the late afternoon/evening.
Pairing a heat pump with storage lets homeowners shift usage and avoid peak pricing.
Is It Always a Good Solution?
It depends on your situation:
Good fit if:
You live in a region with mild winters (like most of California).
You’re planning to replace aging HVAC equipment or gas furnaces.
You want to reduce reliance on fossil fuels and improve indoor comfort.
You already have or plan to install solar PV with sufficient capacity.
Potential challenges:
In very cold climates, heat pumps may need backup resistance heating, which increases energy use.
Upfront costs for both a heat pump and a solar + storage system can be significant.
System sizing is critical — undersized solar arrays may not cover the added load.
The Bottom Line
Heat pumps and solar PV + ESS are complementary technologies. Heat pumps make homes more energy-efficient and all-electric, while solar plus storage ensures that extra demand is met sustainably and resiliently. For many California homeowners, combining the two is a smart long-term strategy — but the right solution depends on climate, home size, and budget.
Before making the switch, it’s best to consult with both a licensed HVAC contractor and a solar professional who can model your home’s projected energy use and recommend the right system size.
9/24/2025
Earthquakes Remind Us: Why Solar + Battery Systems Are Essential for Bay Area Homes
Just a few days ago, the Bay Area was shaken by a 4.3-magnitude earthquake near Berkeley/Pinole. While this was a moderate event, it served as an important reminder that we live in an earthquake-prone region where power outages can occur at any time. As an electrical engineer working with residential energy systems, I see firsthand how families are left vulnerable when the grid fails — and why solar panels combined with energy storage systems (ESS) are no longer a luxury, but a necessity.
How Earthquakes Affect the Grid
During an earthquake, even a moderate one:
Utility infrastructure is vulnerable. Power lines, substations, and transformers can be damaged, leaving neighborhoods in the dark.
Gas pipelines pose safety risks. This makes electric cooking and heating a safer and more reliable option during emergencies.
Restoration can take days. Depending on the severity, PG&E crews may need hours — even weeks — to restore service to all customers.
For homeowners, that means no lights, no internet, no heating, and no way to safely store food unless they have a backup system.
Why Energy Storage Systems (ESS) Matter
When paired with solar panels, battery storage systems like the Tesla Powerwall 3, Enphase IQ, or FranklinWH aPower give families independence from the grid.
From an engineering perspective, here’s what these systems can provide after an earthquake:
2+ Weeks of Critical Power: A well-sized battery can keep essential loads running — refrigeration, lighting, phone charging, internet routers, and medical equipment — for up to two weeks when managed carefully.
Safe Cooking & Heating: Electric induction cooktops, microwaves, or small space heaters can run off stored solar power, eliminating reliance on gas.
Automatic Isolation from the Grid: Modern ESS units include rapid shutoff and islanding capability, which means when the grid goes down, your home seamlessly switches to backup power.
Recharge Daily with Solar: Unlike a gas generator that needs constant refueling, a solar + battery system recharges every morning — ensuring sustainability for as long as the grid is down.
Real-World Resilience for Bay Area Families
Living in the Bay Area means preparing for the unexpected. With earthquakes, wildfires, and storms becoming more common, resilience isn’t optional — it’s essential.
Families who invest in solar + battery systems are not just saving on monthly utility bills; they are also investing in:
Peace of mind during natural disasters
Energy independence from PG&E’s outages and rate hikes
A cleaner, safer alternative to gas generators
Final Thoughts
The Berkeley/Pinole earthquake is a reminder that the grid is fragile, but your home doesn’t have to be. With solar panels and a properly designed energy storage system, you can keep life moving — cooking meals, heating your home, and staying connected — even when the lights go out across the city.
At Ally Electric and Solar, we specialize in designing and installing solar + battery systems that protect families during outages. If you’d like to learn how to make your home more resilient against earthquakes and other emergencies, contact us today for a free consultation.
9/18/25
How Does the NEM 3.0 Application Work?
When you apply for solar or add a battery in PG&E’s territory, your contractor (like Ally Electric and Solar Inc.) files an Interconnection Application. This is how it works:
Submit Interconnection Application
System details (panels, inverters, batteries) are entered into PG&E’s portal.
Required documents: site plan, single-line diagram, spec sheets.
PG&E Review
PG&E checks that your system complies with Rule 21 interconnection standards.
They confirm system size, safety ratings, and that your main panel can handle the system.
Permission to Operate (PTO)
Once approved and inspected, PG&E issues PTO.
This is the official green light for you to run your solar + storage system and start receiving NEM 3.0 credits.
What Does This Mean for Homeowners?
Under NEM 3.0:
Payback is longer without storage → Solar alone saves less because export credits are lower.
Solar + Battery is the new standard → A battery allows you to store daytime power and use it at night, making your system pay off faster.
Energy Security → Batteries provide backup power during PG&E outages.
How Ally Electric and Solar Inc. Can Help
At Ally Electric and Solar Inc. (Richmond, CA – CSLB #806465), we’ve guided hundreds of Bay Area families through the PG&E application process. We handle:
Preparing and submitting your NEM 3.0 interconnection application.
Designing systems that maximize self-consumption under new rules.
Installing trusted batteries like Tesla Powerwall, Enphase IQ, FranklinWH.
Panel upgrades and permitting for seamless integration.
Take Action Now
The sooner you apply, the sooner you can lock in savings and protect your home from rising PG&E rates.
Contact us today to get started with your NEM 3.0 solar + storage consultation.
510-559-7700
info@allyelectricandsolar.com
www.allyelectricandsolar.com
CSLB License #806465
FQAs
1. If I sell excess energy to PG&E, will PG&E charge me for it?
No — PG&E does not charge you for exporting your excess solar energy. Instead, under NEM 3.0, they give you export credits on your bill. The difference is that these credits are now much lower (around 5–8¢ per kWh) compared to the near-retail credits homeowners received under NEM 2.0. That’s why using your own solar energy or storing it in a battery provides greater savings than sending it back to the grid.
2. Will I still get the 30% Federal Solar Tax Credit under NEM 3.0?
Yes. The 30% Federal Investment Tax Credit (ITC) is completely separate from NEM policies. It applies to both solar and battery systems installed through the end of 2025.
3. Is it still worth going solar under NEM 3.0?
Yes — but the strategy has changed. Solar alone saves less than it used to because export credits are lower. Pairing solar with a battery system allows you to store your extra energy and use it during expensive peak hours, which dramatically improves your savings.
4. Can I keep my old NEM 2.0 plan if I already have solar?
Yes. If your system was approved under NEM 2.0, you are grandfathered into that program for 20 years from your Permission to Operate (PTO) date. However, adding new solar capacity may trigger a new NEM 3.0 review. Adding only a battery (without increasing solar size) usually does not change your NEM 2.0 status.
5. How long does the NEM 3.0 application take?
After submitting your application and documents, PG&E typically takes 2–4 weeks to review. Once the city inspection is complete and passes, PG&E issues your Permission to Operate (PTO).
6. Can I charge my battery from the grid under NEM 3.0?
Yes, depending on the configuration. Systems like Tesla Powerwall and Enphase IQ Battery can be set to allow or prevent grid charging. Most homeowners in PG&E territory choose “solar-only charging” to comply with NEM requirements and maximize savings.
7. What happens if I use more electricity than my solar produces?
You’ll still receive energy from PG&E, and you’ll be billed at normal rates for that extra usage. Your solar + battery system helps reduce this by covering as much of your home’s load as possible.
A Guide to Installing a Battery with a Solar System for NEM3.0 Customers in California
Enphase Batteries 30kWh
If you're a California resident with a solar system, you may be eligible for the Net Energy Metering (NEM) 3.0 program. This program allows you to receive credits on your utility bill for any excess energy your solar panels produce. But did you know that you can enhance your solar system even further by adding a battery? As a solar installer, we can help you understand how to install a battery with your solar system and how it can benefit you as a NEM3.0 customer.
Benefits of Adding a Battery
Adding a battery to your solar system has several benefits, especially for NEM3.0 customers:
Increased savings: By storing excess energy in a battery, you can reduce the amount of energy you need to purchase from the grid. This can lead to even greater savings on your utility bill.
Protection during power outages: If there's a power outage, a battery can provide backup power to your home. This can be especially helpful during natural disasters or other emergencies.
Maximize NEM3.0 credits: With a battery, you can store excess energy your solar panels produce during the day and use it at night. This means you can rely less on the grid and more on your own solar system, maximizing your NEM3.0 credits.
How to Install a Battery
Installing a battery with your solar system is a relatively simple process. Here's a step-by-step guide:
Assess your energy needs: Determine how much energy you need to store in a battery to meet your energy needs. This will depend on factors such as the size of your home and your energy usage habits.
Choose a battery: There are several different types of batteries available for solar systems. As a solar installer, we can help you choose the best one for your needs.
Install the battery: Our team will install the battery and connect it to your solar system.
Configure the battery: We will configure the battery to ensure it's working properly with your solar system and maximize your NEM3.0 credits.
Start saving: Once your battery is installed and configured, you can start enjoying the benefits of increased savings on your utility bill and energy independence.
How Much You Can Save
The amount you can save by adding a battery to your solar system will depend on several factors, including the size of your solar system, the size of your battery, and your energy usage habits. However, studies have shown that adding a battery can increase your savings by up to 50%.
Conclusion
As a NEM3.0 customer in California, adding a battery to your solar system can be a smart investment. Not only can it increase your energy independence and provide backup power during outages, but it can also lead to even greater savings on your utility bill. As a solar installer, we can help you understand how to install a battery with your solar system and maximize your NEM3.0 credits. Contact us today to learn more about adding a battery to your solar system.
The Future is Electric: A Comprehensive Guide to EV Charger Installation
Introduction: The rise of electric vehicles (EVs) is revolutionizing the transportation industry, with more and more people embracing sustainable and eco-friendly modes of transportation. As EV adoption continues to surge, the need for accessible and convenient charging infrastructure becomes paramount. In this blog post, we will explore the essentials of EV charger installation, discussing key considerations, installation types, and the benefits of having a home charging station.
Planning for EV Charger Installation: Before diving into the installation process, it is crucial to take certain factors into account:
a) Charging Needs: Assess your driving patterns, the electric range of your EV, and the desired charging speed. This evaluation will help determine the appropriate charger type and power level for your requirements.
b) Location: Decide on the most suitable location for your charging station, considering accessibility, available space, and electrical requirements. Home charging stations can be installed in garages, driveways, or carports, while commercial installations may require additional planning and permits.
c) Electrical Capacity: Evaluate your home's electrical capacity to ensure it can handle the additional load of an EV charger. Consult a certified electrician to perform an assessment and determine if upgrades or modifications are necessary.
Types of EV Chargers: Several types of EV chargers are available, each offering different charging speeds and compatibility. The most common options include:
a) Level 1 Charging: This utilizes a standard 120-volt AC outlet and is the slowest method, providing about 4-5 miles of range per hour of charging. Level 1 chargers are typically included with most EVs and are convenient for overnight charging at home.
b) Level 2 Charging: Level 2 chargers operate on a 240-volt power supply, providing significantly faster charging speeds compared to Level 1. These chargers can deliver approximately 25-30 miles of range per hour, making them ideal for daily charging at home or workplaces.
c) DC Fast Charging (Level 3): DC fast chargers are the fastest charging option, capable of providing up to 80% charge in 30 minutes, depending on the vehicle and charger capabilities. They are typically found at public charging stations along highways or commercial areas, enabling long-distance travel and quick top-ups.
Home EV Charger Installation: Installing a home EV charging station involves the following steps:
a) Electrical Panel Upgrade: If your home's electrical panel requires upgrading to support the EV charger's power demands, consult a licensed electrician to perform the necessary upgrades safely.
b) Permitting: Check with your local authorities to determine if any permits are required for the installation. Permitting regulations may vary depending on your location.
c) Charging Station Selection: Choose a charging station from reputable manufacturers that aligns with your EV's charging capabilities and fits your budget. Ensure compatibility with your vehicle's charging port.
d) Professional Installation: While some charging stations can be installed as a DIY project, it is highly recommended to hire a professional electrician to ensure the installation meets all safety codes and guidelines.
Benefits of Home EV Charging: Having a home EV charger offers numerous advantages:
a) Convenience: With a home charging station, you can conveniently charge your EV overnight or during off-peak hours, ensuring your vehicle is always ready to go.
b) Cost Savings: Home charging is often cheaper compared to public charging stations, reducing your overall charging costs and eliminating the need for frequent visits to public charging stations.
c) Efficiency: Level 2 chargers provide faster charging speeds, enabling you to maximize your EV's range while minimizing charging time.
d) Sustainability: By charging your EV at home, you have the opportunity to use renewable energy sources, such as solar panels, reducing your carbon footprint
NEM 2 Sunset Contractor FAQ's
When does the NEM2 program end?
The NEM2 Program will be closed to new applicants starting April 15th, 2023.
What do I need to submit to qualify a customer for NEM2?
Before 11:59 on April 14th, 2023, you must submit the following:
Completed application, free of major deficiencies (e.g. no blanks, incomplete/inaccurate documents, changes requiring resubmission per Rule 21)
A single-line diagram (a simplified representation of an electrical system)
A signed Contractor State License Board (CSLB) Disclosure and Solar Consumer Protection Guide (for residential, non-self install only)
A signed Agreement
To retain eligibility, final electrical clearance (often referred to as final building or electrical permit) must be submitted before April 15, 2026.
Can new construction projects that have applied for service but are unable to submit a generation application before the NEM2 sunset date still qualify for NEM2?
PG&E will make an exception for new construction projects unable to submit a completed application by the sunset date. If the load application is submitted by the NEM2 sunset date, the project will be eligible for NEM2 provided the site is energized under the same Service Point notification (also known as project or notification number). To retain this eligibility, final electrical clearance must be granted by April 15, 2026.
Can I make changes to my application after submission?
A one time modification request will be allowed for:
Like-for-like equipment replacements
System size reductions not exceeding 20% (Any upgrades or mitigations caused by the change would be paid for by the customer)
System size reductions to avoid upgrades if the re-study determines the modification affects no other distributed energy resource (This modification affects no other distributed energy resource (This modification requires a $300 fee.)
What does like-for-like equipment replacements mean?
For inverters: Certified, same nameplate or smaller, same fault current or smaller
For solar panels: Certified same CEC-AC rating of the system or smaller
For batteries: Same or less kWh and kW rating and same operating profile
For transformers: Same connection type, same or smaller impedance and capacity
How is system size determined?
For solar system: The lesser of inverter nameplate capacity (kW) or maximum solar output (CEC-AC rating)
For batteries: Both the inverter nameplate capacity (kW) and the capacity of the storage device (kWh) are considered in the definition of size
For other generation types: The gross nameplate rating of the generator
Can I add a battery to my application after I submit?
Adding a battery after initial submission is considered a material modification that would result in withdrawal and resubmission of the application. If the resubmission of the application is after the NEM2 sunset date (April 15, 2023), the project will not qualify for NEM2. Instead, you could gain Permission to Operate (PTO) approval without a battery and then submit an interconnection request for the battery later without losing NEM2 eligibility.
How will uncompleted applications left in the portal be treated after the sunset date?
Any applications that are in progress and not submitted in the portal by 11:59 p.m. on April 14, 2023 will be canceled. Contractors will be notified of their need to resubmit the interconnection application in the PG&E interconnection portal under Solar Billing Plan.
Can I add to my existing NEM1 or NEM2 system and not move to the new tariff?
You can increase your system size up to 10% or 1kW, whichever is greater, without moving to the successor tariff. If you increase your system size beyond this threshold, it is unclear if you can remain on NEM1 or NEM2 for the 20 year period (legacy status) from date the solar system PTO approval was provided. The final decision was not clear on how modifications above the threshold would work after the sunset date. These details will be determined in the coming months.
These questions and answers were taken from the official PG&E website.