Solar + EV Charging in Temecula: How to Size Your System, Optimize Charging, and Make the Most of NEM 3.0

Adrian Marin|Independent Solar Advisor, Temecula CA

Helping Riverside County homeowners navigate SCE rates and solar options since 2020

Temecula and Murrieta consistently rank among the highest EV-per-capita cities in the Inland Empire, and the adoption rate is accelerating. The combination of new-construction homes with garage electrical panels, a commuter culture that puts consistent miles on vehicles, and a homeowner demographic that skews toward early adopters means a significant percentage of local households already own or are planning to purchase an electric vehicle. What many of those households have not fully worked out is that solar and EV charging are not just compatible -- under NEM 3.0, they are designed for each other. This guide walks through exactly how to pair them, size correctly, optimize the charging schedule, and understand what the Inflation Reduction Act means for your specific installation costs.

Why Temecula and Murrieta Lead the Inland Empire in EV Adoption

SW Riverside County has several structural factors that drive EV adoption above the regional average. The primary one is income: Temecula and Murrieta median household incomes run 30 to 40 percent above the Inland Empire average, which puts EVs -- typically carrying a $10,000 to $20,000 premium over comparable ICE vehicles -- within reach for a higher share of the population. The second factor is commute distance: many Temecula/Murrieta residents commute to San Diego County, coastal Orange County, or western Los Angeles County, meaning daily mileage in the 40 to 80 mile round-trip range. EVs make strong economic sense at those mileage levels.

The third factor is new construction. A high percentage of Temecula's housing stock was built after 2000, and essentially all new construction in Murrieta since 2020 has been required to include EV-ready conduit and a 240V outlet in the garage. Homeowners in newer neighborhoods face almost no upgrade friction to add Level 2 charging -- they often just need to install the EVSE unit itself. In contrast, homeowners in older neighborhoods (pre-2000 construction) frequently need a panel upgrade or at minimum a new 240V circuit to the garage before Level 2 charging is possible.

The California Air Resources Board's (CARB) Advanced Clean Cars II regulation mandates that 100 percent of new car sales in California be zero-emission by 2035. With that regulatory backdrop and current federal and state incentives in place, EV adoption in SW Riverside County will continue accelerating. Homeowners who install solar now and size it for current-plus-EV usage are positioning themselves for the long-term economics rather than optimizing for today's usage alone.

Why Solar + EV Is Better Than Either One Alone (Especially Under NEM 3.0)

Solar alone under NEM 3.0 is less compelling than it was under NEM 2.0. The reason: NEM 3.0 reduced the credit rate for surplus solar exported to the grid from near-retail rates (NEM 2.0) to avoided-cost rates that average $0.04 to $0.08 per kWh. If your solar system produces more electricity than you use during the day, the excess earns very little credit. The only way to capture the full value of your solar investment under NEM 3.0 is to consume your solar production on-site rather than exporting it.

This is where EV charging changes the math dramatically. An EV charging at 7.2 kW (a standard Level 2 rate) for 2 hours consumes 14.4 kWh -- the equivalent of running a central air conditioning system for most of a day. If that charging happens during the solar production window (10am to 3pm), every kWh consumed by the EV is worth $0.25 to $0.35 in displaced grid electricity rather than $0.04 to $0.08 as a grid export credit. The EV becomes the most valuable self-consumption load in the house.

EV alone without solar means paying retail SCE rates for every mile driven on electricity. On SCE's TOU-D-PRIME rate schedule (SCE's EV-specific rate), off-peak rates are approximately $0.17 to $0.20/kWh during overnight hours. At 3.5 miles per kWh (typical EV efficiency), that works out to roughly $0.05 to $0.06 per mile in electricity costs -- cheaper than gasoline at any price but still a meaningful cost. Add solar, and those miles approach $0 cost during self-consumption windows.

The combination creates a flywheel: solar maximizes self-consumption value by having a large, schedulable load (the EV) available to absorb midday production. The EV maximizes fuel savings by using solar rather than grid electricity. NEM 3.0's low export rates, which initially seemed like bad news for solar, actually created the economic conditions where the solar + EV pairing is more valuable than either component standalone.

Level 1 vs. Level 2 vs. DC Fast Charge: What Actually Makes Sense at Home

Understanding the three charging levels is essential before making any equipment decisions.

Level 1 charging from a standard 120V outlet adds 3 to 5 miles of range per hour. For a Temecula commuter driving 40 miles round-trip daily, Level 1 requires 8 to 12 hours of charging per day -- which means plugging in immediately when you get home and drawing the entire charge from overnight grid electricity, not from solar. Level 1 works adequately for PHEV drivers with 20 to 50 miles of electric range, but it is essentially incompatible with solar self-consumption optimization for full BEV owners.

Level 2 at 240V is the correct choice for any Temecula homeowner pairing solar with EV charging. A 40-amp circuit with a 32-amp continuous-rated EVSE delivers 7.68 kW of charging power, adding approximately 25 miles of range per hour. A 12,000-mile/year driver needs to replace an average of 33 miles per day, which requires only 1.3 hours of Level 2 charging. That charging session can be completed entirely within the solar production window during off-days or partially during weekday solar hours with flexible scheduling.

The EVSE equipment itself (ChargePoint Home Flex, Tesla Universal Wall Connector, Emporia Level 2) costs $400 to $800. Installation labor adds $300 to $1,500 depending on the distance from the main panel to the garage and whether the panel requires an upgrade. When installed alongside solar in the same project, the EVSE installation is eligible for the 30% federal Investment Tax Credit under the Inflation Reduction Act -- more on that below.

How to Size Solar for EV Charging: Adding the Right Number of Panels

The standard solar sizing formula adds approximately 1 to 2 kW of solar panel capacity for every 25 miles of daily EV driving. Here is the reasoning behind that number.

The average EV consumes approximately 0.28 to 0.35 kWh per mile of combined highway/city driving in the heat of a Southern California summer (air conditioning load increases EV energy consumption by 15 to 30 percent). At 25 miles of daily driving:

If you are sizing solar for a household that does not yet own an EV but plans to purchase one within the next 3 to 5 years, add the EV load to your solar sizing calculation now. Adding panels later -- after the initial installation -- is expensive: permitting, labor mobilization, potential inverter upgrades, and the possibility that roof space has become constrained. Installing 3 to 6 extra panels during the initial project costs roughly $3,000 to $6,000 in marginal cost, compared to $8,000 to $14,000 to add-on as a separate project.

Time-of-Use Optimization: When to Charge Your EV to Maximize Solar Value

The timing of EV charging is as important as the size of the solar system. SCE's TOU rate schedules divide the day into peak, off-peak, and super off-peak windows, with prices varying by 200 to 400 percent between the highest and lowest rate periods. Charging your EV at the wrong time can eliminate much of the savings from your solar system.

Under SCE's TOU-D-PRIME rate (the EV-optimized rate that offers the lowest overnight rates), the rate structure is approximately:

Without solar, the optimal EV charging strategy on TOU-D-PRIME is to charge from midnight to 9am during super off-peak hours, when rates are at their lowest. At $0.16/kWh average, charging 12 kWh per night costs about $1.92 per day, or roughly $700 per year for a 40-mile/day driver.

With solar, a different strategy often wins. If your EV can be plugged in during the day -- which is the case for many Temecula homeowners who work from home, have a second vehicle for commuting, or can charge during a weekend day at home -- scheduling charging during the mid-peak window (9am to 4pm) when your solar is producing displaces grid electricity that would otherwise cost $0.28 to $0.32/kWh. The actual cost of your solar electricity is effectively $0 for self-consumed production, so the savings relative to super off-peak charging are meaningful.

Most modern EVs (Tesla, Ford, GM, Hyundai/Kia, Rivian) support scheduled charging via the vehicle's app or built-in timer. Set the charge schedule to prioritize midday hours when you are home, and use overnight super off-peak as the fallback for weekday commuting days when daytime charging is not possible. Smart EVSE units (ChargePoint, Emporia, Enel X) can also integrate with utility rate schedules to auto-optimize charging timing.

The Full Optimization Stack: Battery + Solar + EV Charging

Adding a home battery to the solar + EV combination creates a three-way optimization that maximizes self-consumption, minimizes on-peak grid electricity purchases, and provides backup power capability.

This full optimization stack -- solar + 10 kWh battery + smart EV charging -- can reduce a Temecula household's annual grid electricity purchases to near zero for 6 to 8 months of the year, with modest grid purchases during December and January when solar production drops. The annual true-up bill under this configuration typically runs $200 to $600 rather than $2,400 to $4,800 without solar.

Bidirectional Charging, V2H, and V2G: Your EV as a Home Battery

Bidirectional charging allows electricity to flow in both directions between your EV and your home. Instead of your EV only drawing power from the grid or solar, it can also send power back to your home (Vehicle-to-Home, V2H) or back to the grid (Vehicle-to-Grid, V2G). The EV's large battery pack -- typically 75 to 130 kWh for full-size pickups -- becomes a mobile power storage device that dwarfs any residential battery product on the market.

The Ford F-150 Lightning and Chevy Silverado EV are the most widely available bidirectional-capable vehicles in the Temecula/Murrieta market as of 2026. The Lightning comes standard with Ford Intelligent Backup Power, which can power a home for 3 to 10 days depending on load during a grid outage -- using only the 98 or 131 kWh battery already in the vehicle. The Silverado EV offers similar V2H capability through the PowerShift charging system.

In a solar + V2H configuration, the Lightning or Silverado becomes a 98 to 131 kWh battery that is recharged for free during daytime solar production hours. It can replace or supplement a conventional home battery (like a Powerwall) entirely, since the vehicle's capacity is 10 to 13 times larger than a standard 10 kWh home battery. During SCE PSPS events or grid outages, the vehicle runs the house. During peak rate hours, it can discharge to offset expensive grid electricity.

The practical limitation of V2H today is that it requires the vehicle to be parked at home during discharge windows. For households with two vehicles -- one EV (the bidirectional truck or SUV) and one conventional or smaller EV -- this works well: the big truck stays home as the backup battery while the second vehicle handles daily commuting. V2G (sending power back to the grid for compensation) is still in pilot stages in California and is not yet available to most residential SCE customers, but the regulatory framework is developing rapidly.

Federal Tax Credits: The ITC Covers Your EV Charger When Done With Solar

The Inflation Reduction Act (IRA) of 2022 extended the federal Investment Tax Credit (ITC) for solar at 30 percent through 2032. Less well-known is that the IRA also reinstated and expanded the Alternative Fuel Vehicle Refueling Property Credit (IRC Section 30C), which covers EV charger installation.

When you install a Level 2 EVSE alongside a solar system in a single project, both the solar equipment and the EV charger are eligible for the 30 percent federal tax credit. The credit is not a deduction but a direct reduction of your federal income tax liability. If the credit exceeds your tax liability in the installation year, the excess rolls forward to future years.

California's Self-Generation Incentive Program (SGIP) provides additional rebates for battery storage, with enhanced incentives for households in high-risk fire areas. Parts of SW Riverside County qualify for SGIP Equity Resiliency funding at $1,000 per kWh of installed battery capacity -- which represents a $10,000 rebate on a 10 kWh system. Check your eligibility at the SGIP portal before finalizing any battery purchase, as funds are allocated on a first-come basis.

SCE TOU-D-PRIME: How the EV Rate Schedule Works and When Solar Changes the Calculus

SCE's TOU-D-PRIME rate is designed specifically for EV owners. It offers the lowest super off-peak overnight rates of any SCE residential rate schedule, which makes it attractive for EV drivers who charge primarily at night from grid electricity. However, the on-peak rate from 4pm to 9pm is also higher than SCE's standard residential rates, which means TOU-D-PRIME can be a bad deal for households that do not actively manage their EV charging timing.

The key question for any Temecula solar + EV household is whether to enroll in TOU-D-PRIME or stay on a standard TOU-D rate. The answer depends primarily on how much EV charging you can accomplish during solar production hours vs. how much must happen overnight from the grid.

Households that work from home at least 3 to 4 days per week -- which is common in the Temecula/Murrieta demographic -- can likely schedule the majority of EV charging during solar hours. For these households, staying on TOU-D (the standard rate) rather than TOU-D-PRIME may be advantageous because the standard rate's on-peak window has lower rates. TOU-D-PRIME's lower super off-peak rate only matters if you are frequently forced to charge overnight from the grid.

Request a rate analysis from your solar installer or from SCE directly before switching rate plans. SCE's online rate comparison tool lets you model different rate schedules against your historical usage. With solar data in your billing history after a year of operation, you can run an accurate comparison of TOU-D-PRIME vs. TOU-D vs. TOU-D-4-9PM to determine which rate minimizes your annual true-up bill given your specific usage patterns.

The Real Savings Math: 12,000 Miles Per Year in Temecula

The following calculation uses a realistic Temecula household profile: one EV (Tesla Model Y or comparable) covering 12,000 miles per year, a 10 kW solar system sized to cover household load plus EV charging, and SCE TOU-D rates as the baseline comparison.

Add the solar system's impact on household electricity (separate from the EV): a 10 kW system in Temecula produces approximately 15,000 to 17,000 kWh per year. The average Temecula home without an EV uses 9,000 to 12,000 kWh annually. With an EV adding 3,429 kWh, total household consumption reaches 12,000 to 15,429 kWh -- within the production range of a properly sized 10 kW system. Total combined savings (household electricity + EV fuel) can reach $2,400 to $3,600 per year.

At $2,800 in annual savings and a net system cost of $29,260 after the federal ITC (using the earlier example), the payback period is approximately 10.5 years. Solar panels carry 25-year performance warranties. The remaining 14.5 years of system life after payback represents $40,600 in electricity and fuel savings at today's rates -- before accounting for SCE's historical rate increases of 4 to 6 percent per year, which compress the effective payback period further.