The most common sizing mistake Temecula homeowners make is designing a solar system for their current electricity bill and then buying an EV six months later. The EV adds 30 to 50 percent more electricity demand to the average household, and a system sized for the old bill will leave you buying peak-rate grid power every evening to charge the car. That is the opposite of the financial case you signed up for.
This guide goes deep on the math. You will find the weekly kilowatt-hour add for specific vehicle models, the honest comparison between Level 1, Level 2, and DC fast charging for home use, exactly how many extra panels different EV loads require in Temecula, the SCE rate plan comparison for EV owners with solar, two-EV household sizing, Powerwall as an EV charging buffer, and the stacked payback when fuel savings and electricity savings combine.
How Much Electricity Does an EV Actually Add to Your Home?
Every EV has an EPA efficiency rating expressed in miles per kilowatt-hour or kilowatt-hours per 100 miles. The real-world figure in Temecula is typically 5 to 10 percent below the EPA rating in summer because cabin air conditioning adds load. Here are the key models with their real-world efficiency and what that translates to in weekly electricity demand at typical California commute distances:
Weekly EV Electricity Demand by Model (Based on 12,000 Miles per Year)
| Vehicle | Miles/kWh | kWh/Week | kWh/Year | Extra Panels* |
|---|---|---|---|---|
| Tesla Model 3 RWD | 4.0 | 58 kWh | 3,000 kWh | 3-4 panels |
| Tesla Model 3 Long Range | 3.4 | 68 kWh | 3,529 kWh | 4-5 panels |
| Tesla Model Y Long Range | 3.2 | 72 kWh | 3,750 kWh | 4-5 panels |
| Chevy Equinox EV | 3.1 | 74 kWh | 3,871 kWh | 5 panels |
| Hyundai Ioniq 6 SE | 4.0 | 58 kWh | 3,000 kWh | 3-4 panels |
| Rivian R1S Dual | 2.7 | 85 kWh | 4,444 kWh | 5-6 panels |
| Ford F-150 Lightning Pro | 2.3 | 100 kWh | 5,217 kWh | 6-7 panels |
*400-watt panels at 5.7 peak sun hours (Temecula annual average), 85% system efficiency. Extra panels required beyond baseline home sizing. Miles per kWh are real-world estimates for Inland Empire climate conditions.
The practical takeaway: a compact EV sedan like the Model 3 RWD or Ioniq 6 adds roughly 30 to 40 kilowatt-hours of demand per week at 12,000 annual miles. A full-size EV truck like the F-150 Lightning adds nearly 100 kilowatt-hours per week for the same mileage. The difference in solar sizing between those two categories is 3 to 4 panels versus 6 to 7 panels. If you are choosing between a Model Y and an F-150 Lightning and plan to add solar, the vehicle choice is also a solar sizing decision.
California drivers average closer to 14,000 miles per year than the national 12,000. Temecula commuters driving to San Diego or Los Angeles often log 18,000 to 22,000 miles annually. Scale the panel count in the table above by your actual annual mileage divided by 12,000 to get your specific extra panel requirement.
Level 1 vs Level 2 vs DCFC: What Homeowners Actually Install
Three charging tiers exist for EVs. Understanding what each delivers and which one integrates well with solar is essential before you add panels or wire a new circuit.
Level 1 - 120V, 1.2 to 1.4 kW
Included with most EVsLevel 1 plugs into any standard 120V household outlet. It draws 1.2 to 1.4 kilowatts and adds 3 to 5 miles of range per hour. For a Tesla Model 3 that drove 30 miles today, recovering that range takes 6 to 8 hours of overnight charging. Level 1 works mathematically for local drivers who rarely exceed 20 to 25 miles per day.
The solar integration problem: at 1.2 kW draw for 8 hours, Level 1 charging runs from midnight to 8am when solar production is zero. You are buying grid electricity at off-peak rates, not consuming solar. There is no practical way to time-shift Level 1 charging into a solar production window because it takes longer to replenish range than the solar day lasts. For NEM 3.0 self-consumption strategy, Level 1 simply does not work.
Not recommended for solar self-consumption. Use only as a temporary backup or for drivers covering under 20 miles daily.
Level 2 - 240V, 7 to 11.5 kW
Standard for solar homesLevel 2 requires a 240V circuit (same voltage as a clothes dryer) and a dedicated EVSE unit. It delivers 7 to 11.5 kW depending on the charger and the car's onboard charger acceptance rate. At 7.7 kW, a Model 3 recovers 25 miles of range per hour. That 30-mile commute refills in about 75 minutes.
That speed is what makes solar integration work. A 75-minute Level 2 session scheduled from 11am to 12:15pm falls squarely in the solar production peak. You charge the car entirely from panels you generated, avoid exporting that energy at NEM 3.0's low compensation rate, and avoid buying peak-priced grid power later. Level 2 is the default choice for any solar homeowner adding an EV.
Recommended for all solar homeowners. Requires a 40-amp or 50-amp dedicated circuit and a licensed electrician installation.
DC Fast Charging - 50 kW to 250 kW
Commercial infrastructure onlyDC fast chargers (Tesla Superchargers, Electrify America, ChargePoint DC) deliver 50 kW to 350 kW directly to the battery, bypassing the car's onboard AC to DC converter. A Tesla Model 3 at a 250 kW Supercharger adds 200 miles of range in about 15 minutes. These are the roadside chargers you use on long trips.
No homeowner installs DCFC at home. The transformer infrastructure, utility service upgrade, and hardware cost typically exceed $50,000. Even if a homeowner wanted to, the utility connection requirements for 50 kW service are commercial grade. Every home EV charging setup uses Level 1 or Level 2. Ignore any contractor who suggests otherwise.
Used at public charging stations for long trips. Not relevant to home solar or home charging infrastructure decisions.
Charging Timing Optimization: The 11am to 2pm Self-Consumption Window
Under NEM 3.0, the compensation rate for power you export to the SCE grid averages 2 to 8 cents per kilowatt-hour during the midday solar peak. But buying that same power back during the 4pm to 9pm peak costs 30 to 55 cents per kilowatt-hour. That gap is why every kilowatt-hour you consume directly from your panels is worth roughly 5 to 15 times more than every kilowatt-hour you export.
The optimal window for EV self-consumption is 11am to 2pm, when solar production is highest and grid export compensation is lowest. A 10 kW system in Temecula produces roughly 8 to 10 kW of net output during that window after home base loads. A Level 2 charger running at 7.7 kW during that window consumes nearly all of that surplus directly, leaving little to export at the low NEM 3.0 rate.
Charging Window Value Comparison (SCE NEM 3.0 Approximate 2026 Rates)
| Time Window | Solar Production | Grid Import Rate | Value per kWh Used | Verdict |
|---|---|---|---|---|
| 6am to 10am | Low, ramping | ~$0.17/kWh | $0.17 | OK if surplus exists |
| 11am to 2pm | Peak production | ~$0.17/kWh | $0.17 avoided + $0.05 export avoided | Best window |
| 2pm to 4pm | Good, declining | ~$0.17/kWh | $0.17 | Good if car available |
| 4pm to 9pm | Minimal to zero | $0.30 to $0.55/kWh | High cost from grid | Avoid |
| 9pm to 6am | None | ~$0.15/kWh | $0.15 | Acceptable off-peak fallback |
Most Temecula commuters work 8am to 5pm and cannot park the car at home during the 11am to 2pm window. That is where battery storage changes the equation. A Powerwall captures solar production during the day when the car is away, then releases it in the evening for EV charging. The car charges from stored solar rather than peak-rate grid power, achieving the same self-consumption benefit without requiring the car to be home during solar hours.
Weekend charging is where solar self-consumption is easiest. The car sits in the garage Saturday and Sunday. Schedule Level 2 charging for 10:30am to noon on those days and you recover 100 to 150 miles of range entirely from solar with zero grid import.
Extra Solar Panels Needed by Driver Profile
Rather than a single figure, the extra panel count depends on three variables: the vehicle efficiency, the annual mileage, and whether charging happens primarily from direct solar or through stored battery power. Here is the sizing worksheet Temecula installers use:
EV Panel Count Formula
Annual EV kWh = Annual Miles divided by (Miles per kWh x 0.90)
The 0.90 factor accounts for Level 2 charging losses and real-world efficiency below EPA rating in hot weather.
Extra kW needed = Annual EV kWh divided by (5.7 peak hours x 365 x 0.85)
Extra panel count = Extra kW divided by 0.4 (400W panel)
Worked Examples for Common Temecula Driver Profiles
Local Driver - Tesla Model 3 RWD, 8,000 miles/year
Annual EV kWh
8,000 / (4.0 x 0.90) = 2,222 kWh
Extra system size
2,222 / 1,770 = 1.26 kW
Extra panels at 400W
3 to 4 panels
Incremental system cost
$3,500 to $5,500 before ITC
Average Commuter - Tesla Model Y LR, 15,000 miles/year
Annual EV kWh
15,000 / (3.2 x 0.90) = 5,208 kWh
Extra system size
5,208 / 1,770 = 2.94 kW
Extra panels at 400W
7 to 8 panels
Incremental system cost
$7,800 to $11,200 before ITC
High-Mileage Truck Owner - F-150 Lightning, 18,000 miles/year
Annual EV kWh
18,000 / (2.3 x 0.90) = 8,696 kWh
Extra system size
8,696 / 1,770 = 4.91 kW
Extra panels at 400W
12 to 13 panels
Incremental system cost
$13,700 to $18,200 before ITC
Tesla App Solar Charging and the Schedule Feature
Tesla provides two primary tools for solar-aware charging: the Schedule feature built into the vehicle and the Go Solar integration available when a Tesla Powerwall is present.
The Schedule feature lets you set a specific start time directly in the Tesla app or on the car's touchscreen. You plug in when you get home at 6pm, set charging to begin at 11am the next day, and the car sits at whatever state of charge it had from the commute until 11am. At that point, the Level 2 session begins pulling from whatever power source is available, ideally your solar panels via direct grid-tied production or a Powerwall.
The Go Solar feature is only available on the Tesla app when a Powerwall is linked to the same account. In self-consumption mode, the Powerwall app detects when solar production exceeds home base loads and can trigger EV charging automatically from that surplus. This eliminates the need to manually schedule a specific time, because the system determines when surplus exists in real time.
Non-Tesla Vehicles: Smart Charging Options
ChargePoint Home Flex
Schedule charging windows via the ChargePoint app. Set a 10am to 2pm window for any J1772-compatible vehicle. No inverter integration required.
Wallbox Pulsar Plus with myWallbox App
Solar surplus mode dynamically adjusts charging rate to match real-time solar production above home base load. No manual scheduling required when surplus mode is active.
Enphase IQ Charger
Deepest integration for Enphase system owners. Communicates with the IQ Battery and IQ Microinverters to charge EVs only from solar surplus, with battery state of charge as a priority gate.
Ford Intelligent Charge Station
Ford-native charger for the F-150 Lightning and Mach-E with scheduling via the FordPass app. Required for bidirectional V2H use with the Lightning's Intelligent Backup Power system.
Ford Intelligent Backup Power and Bidirectional Charging in California
Bidirectional charging means the EV battery can discharge power back out through the charging port to supply electricity to a home or the grid. As of 2026, the following vehicles support this capability for residential home backup use in California:
Ford F-150 Lightning with Ford Intelligent Backup Power
Available nowThe Extended Range Lightning (131 kWh) exports up to 9.6 kW to a home through the Ford-approved Pro Power Home transfer switch system. A fully charged Lightning can power an average Temecula home for 3 to 4 days without solar and indefinitely when paired with a solar array that recharges it during the day. Installation of the transfer switch and integration kit adds $3,500 to $6,500 to the project cost. Requires a Ford-approved installer.
Chevy Silverado EV and GMC Sierra EV with PowerBase
Available nowGM's PowerBase system on the Silverado EV RST and Sierra EV Denali exports up to 10.2 kW to a home. The 200 kWh battery on the Silverado EV provides exceptional whole-home backup capacity. Requires a GM-compatible transfer switch installed by a GM-certified dealer installer. SCE is piloting V2G integration with GM vehicles in Riverside County.
Kia EV6 and Hyundai Ioniq 5, Ioniq 6 with V2L
Limited V2L onlyVehicle-to-Load (V2L) via a J1772 adapter outputs up to 3.6 kW from the vehicle's charge port. This powers appliances and devices but cannot tie into a home's electrical panel for whole-home backup. Useful for camping, job sites, and small loads during outages. Not a replacement for a home battery or V2H system.
Tesla Vehicles
Not yet available in USTesla has confirmed that Cybertruck and future Model 3 and Y variants will support bidirectional charging using the NACS connector standard. As of mid-2026, V2H is not available on any Tesla vehicle in the United States. For home backup, Tesla owners pair vehicles with Powerwall rather than using the car's battery directly.
SCE EV Rate Plans: TOU-EV-1 vs TOU-EV-2 vs TOU-D-PRIME for Solar Owners
SCE offers two dedicated EV rate plans designed for households without solar, plus the standard solar rate. Understanding which rate plan works best for your specific combination of solar generation and EV charging demand can save or cost several hundred dollars per year.
SCE Rate Plan Comparison for Solar + EV Homeowners (Approximate 2026)
| Plan | Off-Peak Rate | Peak Rate | Solar Compatible | Best For |
|---|---|---|---|---|
| TOU-EV-1 | ~$0.12 to $0.15 | ~$0.35 to $0.50 | No NEM billing | EV owners without solar |
| TOU-EV-2 | ~$0.13 to $0.16 | ~$0.30 to $0.45 | No NEM billing | Multi-EV without solar |
| TOU-D-PRIME | ~$0.15 to $0.17 | ~$0.30 to $0.55 | Yes - NEM 3.0 | Solar owners with EV |
Rates are approximate and vary by season and baseline allocation. Verify current rates at sce.com before selecting a plan. TOU-EV-1 and TOU-EV-2 do not support NEM billing; solar owners must remain on TOU-D-PRIME or a compatible NEM 3.0 tariff.
TOU-EV-1 is attractive for non-solar households because overnight rates are very low, roughly 12 to 15 cents per kilowatt-hour from midnight to noon. That makes overnight Level 1 or Level 2 charging cheap. The tradeoff is that the peak period runs noon to 9pm, making any daytime electricity use expensive.
Solar owners cannot use TOU-EV-1 because it does not include NEM billing. You must remain on a NEM 3.0 compatible tariff like TOU-D-PRIME to receive compensation for solar exports and to have the NEM annual true-up mechanism that is the foundation of the solar financial model. If you are on solar and considering adding an EV, stay on TOU-D-PRIME and focus your energy on shifting EV charging into the midday solar window rather than chasing the lower overnight rates on EV-specific tariffs you cannot use.
Two-EV Household Sizing: Panel Count Math and 400-Amp Service Considerations
Two EVs in one household are increasingly common in Temecula. Couples where both partners commute, or households that replace both a sedan and a truck with EVs, face a fundamentally different sizing challenge than a single-EV home.
The combined annual electricity demand of a two-EV household driving a total of 25,000 to 28,000 miles per year can reach 9,000 to 13,000 kilowatt-hours of added load. That is more than the baseline electricity consumption of many California homes. Here is how the math works for a common two-EV Temecula scenario:
Two-EV Sizing Example: Tesla Model Y + Ford F-150 Lightning
A 17 kW system requires significant roof area, typically 800 to 1,000 square feet of usable panel space. Not every Temecula roof accommodates that. Homes with complex roof lines, heavy shade from nearby trees, or insufficient south and west-facing area may need to size down and accept partial solar coverage, supplementing with off-peak grid imports for the remaining EV charging demand.
The electrical service question for two-EV homes is real. Most homes have a 200-amp main panel. Running two Level 2 chargers simultaneously, one at 40 amps and one at 50 amps, plus the home's baseline load, can push a 200-amp service panel near its limit on summer evenings when AC is also running.
Two solutions exist. The first is smart load management: charger brands including Wallbox, ChargePoint, and JuiceBox offer paired units that share a single 60-amp or 80-amp circuit and negotiate charging speed based on available panel capacity. One car charges at full speed while the other throttles down based on total home draw, avoiding panel overload without requiring a service upgrade. The second solution is upgrading to 400-amp service, which costs $5,000 to $10,000 depending on whether the utility transformer and meter base also need replacement. If the house is being rewired for solar anyway, a 400-amp upgrade at the same time costs less than doing it separately.
Powerwall as a Buffer Between Solar Panels and Your EV
The Powerwall's role in a solar plus EV system is often described as a buffer, and that word captures exactly what it does. Panels produce power during the day in a smooth curve. Home base loads are relatively steady. EV charging is a large intermittent spike. Without storage, that spike either happens during solar production (if the car is home) or it must come from the grid (if the car is away).
A Powerwall sits between those two timing realities. During midday when solar surplus exceeds home loads, the Powerwall charges. In the evening when the car arrives home and plugs in, the Powerwall discharges to supply the Level 2 charger from stored solar rather than the expensive SCE peak rate. The car gets solar power regardless of whether it was home during the solar window.
Powerwall Buffer Sizing for EV Charging (Tesla Powerwall 3 - 13.5 kWh)
Tesla Model 3 LR (7.5 kWh daily charge need)
Remaining 6 kWh covers home loads during 4pm to 9pm peak. One Powerwall is sufficient.
Tesla Model Y LR (9 kWh daily charge need)
Tight with home loads. One Powerwall workable for mild weather months; two recommended for summer.
F-150 Lightning (13 kWh daily charge need, 30 mi)
Single Powerwall fully consumed by EV, leaving nothing for home backup. Two Powerwalls required.
The key insight: size the Powerwall for the EV charging need plus the home's evening load, not just one or the other. A 2,400 square foot Temecula home with central AC draws 2 to 4 kW in the evenings for 4 to 5 hours, consuming 8 to 20 kWh during the peak rate window. Add 9 kWh for a Model Y and you need 17 to 29 kWh of storage to get through the full 4pm to 9pm window without touching the grid. That is a two-Powerwall system for full coverage, or a single Powerwall with the EV charging shifted to 9pm or later when off-peak rates take effect.
Home DCFC Equipment: Tesla Wall Connector, ChargePoint Home Flex, Grizzl-E
The three most common Level 2 EVSE brands installed on Temecula solar homes each offer different wiring requirements, amperage options, and solar integration capabilities.
Tesla Wall Connector (Gen 3) - Up to 48A / 11.5 kW
Wiring requirements
- -60-amp dedicated breaker for full 48A charging
- -6 AWG copper wire minimum at 60-amp configuration
- -Hardwired only, no plug-in version
- -NACS connector native (J1772 adapter available)
Solar integration
- -Native Tesla Powerwall scheduling via Tesla app
- -Go Solar mode with Powerwall surplus detection
- -No native integration with Enphase or SolarEdge
Installed cost: $600 to $1,100
ChargePoint Home Flex - 16A to 50A / Up to 12 kW
Wiring requirements
- -Adjustable amperage from 16A to 50A via dip switches
- -Plug-in (NEMA 14-50) or hardwired at any amperage
- -J1772 connector, universal compatibility
Solar integration
- -Schedule via ChargePoint app (time window)
- -No native surplus charging mode
- -Works with any inverter brand via schedule
Installed cost: $650 to $1,200
Grizzl-E Classic and Grizzl-E Level 2 - 16A to 40A
Wiring requirements
- -Available hardwired or with NEMA 14-50 plug
- -50-amp breaker for 40A operation
- -J1772 connector, NEMA 4 outdoor rated
Solar integration
- -No Wi-Fi or app on Classic version
- -Smart version adds scheduling
- -Best value option for budget-conscious installs
Installed cost: $500 to $900
California EV Charger Incentives and AQMD Rebates Available in 2026
Three primary incentive streams cover EV charger installations for Temecula homeowners in 2026. Understanding how they interact with the solar ITC is important for maximizing the combined benefit.
30%
Federal ITC
Investment Tax Credit
EVSE installed with solar qualifies as part of the solar project. No dollar cap on the solar ITC component. Charger hardware + circuit + labor included.
$1,000
Section 30C Credit
Alt Fuel Vehicle Credit
Separate from the solar ITC. 30% of EVSE cost capped at $1,000 for residential installations. Non-refundable, carries forward if unused.
$250+
AQMD Rebate
South Coast Air Quality
AB 118 funded charger rebates for residential installations in the South Coast Air Basin. Temecula is included. Check aqmd.gov for current program availability.
SCE's Charge Ready Home program provides additional rebates of $500 to $1,000 for qualifying income-eligible customers in certain geographic areas. The program is available in parts of Riverside County. Eligibility is income-based and requires installation by an SCE-approved contractor. Check sce.com/ev for current enrollment.
One important coordination note: if you claim the EVSE cost under the solar project's 30% ITC, you cannot also claim it under the 30C alternative fuel credit. Your tax advisor should determine which treatment produces the larger benefit for your specific tax situation. In most cases, including the EVSE in the solar ITC produces a larger dollar benefit because there is no $1,000 cap on the solar ITC component.
The Stacked Payback: Fuel Savings Plus Electric Bill Savings
The financial case for solar plus EV in Temecula rests on two savings streams that compound together rather than acting independently. Most homeowners think about solar payback as a function of the electric bill savings alone. Adding an EV creates a second, often larger savings stream from eliminating gas.
Stacked Annual Savings: Temecula Household (14,000 miles/year, Tesla Model Y)
Gas savings: 14,000 mi x $4.60 per gallon / 28 mpg
$2,300 per year
Replaces a 28mpg vehicle. California average gas price used. Model Y uses electricity instead, covered by solar below.
SCE bill reduction: $320/mo average to minimum connection charge
$3,480 per year
Correctly sized system covers home load plus EV charging, leaving only the ~$12/month minimum connection charge on the NEM 3.0 annual true-up.
Combined annual savings
$5,780 per year
Against a net system cost of $25,000 to $32,000 after the 30% ITC on a combined solar plus EVSE project, the payback period runs approximately 4.3 to 5.5 years. Year 6 onward is pure savings for the remaining 20+ year system life.
The payback math improves every year for two reasons. SCE rates have increased roughly 47 percent since 2020 and historically rise 3 to 5 percent annually. Gas prices follow California's own volatile trajectory, averaging higher than the national mean due to the state's unique fuel blend requirements and refinery constraints. Each rate or price increase widens the savings gap between a solar plus EV household and a grid plus gas household. A homeowner who locks in a solar system today is buying 25 years of protection against both cost vectors simultaneously.
Workplace Charging vs Home Solar: Why Home Wins for Most Temecula Commuters
Many Temecula employers are adding Level 2 workplace chargers as employee benefits. The pitch from the employee side is appealing: charge for free at work during the day, get home with a full battery, no home charging infrastructure needed.
The reality is more nuanced. Workplace chargers are typically Level 2 at 6 to 7.7 kW, available 8 to 10 hours per workday. Most employers are not offering truly free charging permanently; many charge employees a flat fee or a reduced rate. As more EVs arrive at work, charger availability becomes competitive and unpredictable. And workplace charging does not exist on weekends, holidays, vacation days, or remote work days.
Home solar changes the equation. A correctly sized home system produces electricity that costs effectively zero cents per kilowatt-hour to consume directly. That same electricity would cost 30 to 55 cents per kilowatt-hour at SCE peak rates. Over 14,000 annual miles in a Model Y needing 4,861 kilowatt-hours, the difference between solar-covered charging and peak-rate charging is $1,458 to $2,673 per year.
Workplace charging is a supplement, not a replacement, for home solar. If your employer offers it, use it. But size your home solar system for your full annual mileage, not just the miles you drive on weekends and remote work days. The math favors home solar ownership over relying on employer infrastructure for charging.
Common Mistakes: Sizing Solar for Your Current Bill and Forgetting the EV Load
The single most frequent sizing mistake is designing a solar system around the existing SCE bill, then adding an EV a few months after the panels go live. The system is now too small. You are covering the home but still pulling peak-rate grid power every evening for the car.
Sizing for current bill only
If you are buying an EV within the next 3 years, size the system for the EV load now. Adding panels later means a second permit, a second installation mobilization fee, and potentially a second interconnection application to SCE. Incremental expansion is nearly always more expensive per watt than installing the full system upfront.
Choosing Level 1 to save on installation cost
The Level 2 EVSE and dedicated circuit typically add $800 to $1,500 to the project cost after ITC. The annual value of shifting 3,600 kilowatt-hours of EV charging from peak-rate grid power to solar self-consumption exceeds $1,000 per year. Level 2 pays for itself in under two years in most Temecula scenarios.
Not planning for a second EV
California is projecting 8 million EVs by 2030. Many Temecula households will own two EVs within 5 years of buying their first. During initial installation, running a second conduit stub-out, specifying a 200-amp panel, and choosing an inverter with expansion headroom each cost little now and save significantly later.
Ignoring charging timing
Plugging in at 6pm on a non-Powerwall system pulls peak-rate grid power during the most expensive window of the day. A ChargePoint or Wallbox app set to a 10am start time, costing nothing extra, eliminates that cost entirely for any homeowner whose car sits in the garage during the day.
Assuming NEM 1.0 export math under NEM 3.0
Homeowners who installed solar before 2023 on NEM 1.0 got full retail rate for every kilowatt-hour exported. NEM 3.0 pays 2 to 8 cents per kilowatt-hour for exports. Self-consumption is worth 6 to 25 times more than export under NEM 3.0. Every sizing and timing decision should reflect this new reality.
Skipping SGIP on battery storage
The SGIP rebate of $200 per kilowatt-hour for General Market customers produces $2,700 on a single Powerwall and $5,400 on two Powerwalls. Installers submit the reservation automatically, but some cut-rate installers skip the application. Confirm your installer will file the SGIP reservation before signing anything.
Multi-EV Sizing Worksheet: Calculate Your Extra Panel Count
Use this step-by-step worksheet to calculate how many extra panels you need for one or two EVs in Temecula. All figures assume 400-watt panels at 5.7 peak sun hours and 85 percent system efficiency.
Multi-EV Panel Count Worksheet
Step 1: Per Vehicle
Annual miles / (Miles per kWh x 0.90) = Annual EV kWh
Car 1: _____ miles / (_____ mpkWh x 0.90) = _____ kWh
Car 2: _____ miles / (_____ mpkWh x 0.90) = _____ kWh
Step 2: Total EV Load
Car 1 kWh + Car 2 kWh = Total EV kWh
_____ + _____ = _____ kWh total
Step 3: Extra System Size in kW
Total EV kWh / (5.7 x 365 x 0.85) = Extra kW
Total EV kWh / 1,770 = Extra kW
_____ / 1,770 = _____ kW
Step 4: Extra Panel Count
Extra kW / 0.4 (400W panel) = Extra panels
_____ / 0.4 = _____ panels (round up to next whole number)
Worked Example: Two EVs, One Sedan, One SUV
Car 1 (Tesla Model 3 RWD, 12,000 mi): 12,000 / (4.0 x 0.90) = 3,333 kWh
Car 2 (Tesla Model Y LR, 15,000 mi): 15,000 / (3.2 x 0.90) = 5,208 kWh
Total EV kWh: 3,333 + 5,208 = 8,541 kWh
Extra system size: 8,541 / 1,770 = 4.83 kW
Extra panels: 4.83 / 0.4 = 12.1, round to 13 extra panels
Getting a Solar + EV Charging Quote for Your Temecula Home
The ideal time to get a solar plus EV charging quote is before you take delivery of the EV, not after. Sizing the system at the design stage means one permit, one installation, one interconnection application, and one 30 percent ITC claim that covers both the panels and the EVSE hardware and circuit.
When you call or request a quote, have these numbers ready:
Your last 12 months of SCE bill totals (usually on the annual summary page of your SCE online account)
The make, model, and trim of your EV or EVs, including the ones you plan to buy in the next 3 years
Your average annual mileage per vehicle, or your round-trip commute distance times working days
Whether your main panel is 100, 125, 150, or 200 amps (check the label on the main breaker)
The garage location relative to your main panel (same wall, opposite end of house, or detached)
Whether you have or plan to add battery storage
A solar installer who does not ask about your EV or your future EV plans is designing your system with incomplete information. Push back and provide the EV data even if they do not ask. The extra panels for an EV add a relatively small amount to a quote that already has significant scale, and the combined payback calculation that includes fuel savings always looks better than the electricity-only payback.
Temecula Solar Savings sizes systems specifically for EV owners in the Inland Empire. We understand the SCE TOU-D-PRIME rate structure, the SGIP application timeline, and which EVSE and inverter combinations produce the strongest solar self-consumption for your specific EV and commute. Call us for a quote that accounts for your vehicle, your mileage, and your SCE bill together.
Related Guides for Temecula Homeowners
Frequently Asked Questions
How many extra solar panels do I need for an EV in California?
For a typical California driver covering 12,000 miles per year in a sedan like the Tesla Model 3 or Model Y, you need roughly 2 to 4 extra panels beyond what your home already requires. The Model 3 uses about 3.3 miles per kWh, so 12,000 miles annually equals roughly 3,636 kWh of charging demand. In Temecula's 5.7 average peak sun hours, each 400-watt panel produces about 2.2 kWh per day or 803 kWh per year. That means 4 to 5 dedicated panels cover the annual EV load. Trucks like the F-150 Lightning averaging 2.3 miles per kWh over 12,000 miles need 6 to 7 additional panels for the same annual mileage.
Should I charge my EV during the day or at night with solar?
During the day between 11am and 2pm is the best window for direct solar self-consumption. Under NEM 3.0, SCE pays as little as 2 to 5 cents per kWh for power you export to the grid, but charges 30 to 55 cents per kWh during the 4pm to 9pm peak. Every kilowatt-hour you shift into that midday solar window is worth full retail value. If you work from home or can leave the car in the garage during the day, schedule Level 2 charging from 10am to 2pm. If you commute and the car is away all day, a Powerwall captures midday solar and releases it for evening EV charging at home, achieving the same self-consumption benefit.
What is the SCE TOU-EV-1 rate plan and is it better than TOU-D-PRIME for solar owners?
TOU-EV-1 is SCE's dedicated rate for EV owners without solar. It offers very cheap overnight rates (roughly 12 to 15 cents per kWh from 9pm to noon) in exchange for a higher peak rate from noon to 9pm. For homeowners without solar it is often the cheapest option for overnight EV charging. For solar owners on NEM 3.0, TOU-D-PRIME is usually the better choice because it aligns the highest-value export window with midday solar production and avoids the aggressive noon to 9pm peak of TOU-EV-1. Run a bill comparison using your actual SCE bill and daily mileage before switching rates; the optimal plan depends on how much solar you produce and when you charge.
Can I charge two EVs with solar in Temecula?
Yes, but sizing matters. A two-EV household with two Tesla Model Y vehicles each driving 30 miles daily adds roughly 16 kWh of daily charging demand. At Temecula's 5.7 peak sun hours, covering that demand requires about 3.5 kW of additional solar, or 9 extra 400-watt panels beyond what the home already needs. Most two-EV homes also benefit from a 400-amp main panel service or a dedicated subpanel in the garage for load management across two Level 2 chargers. Smart chargers with load sharing (such as the ChargePoint Home Flex pair or two Wallbox units) split available amperage so both cars charge simultaneously without tripping the main panel.
Does Tesla's solar charging schedule work with NEM 3.0?
Yes. Tesla vehicles with a Tesla Wall Connector and a Powerwall running the Tesla app can use the Schedule charging feature to begin charging at a set time, or use the Go Solar feature that triggers EV charging when the Powerwall reports excess solar production. Under NEM 3.0, you configure the Powerwall's self-consumption mode so it stores midday solar and then sets the EV to charge from the Powerwall in the early evening before grid peak rates kick in. Non-Powerwall Tesla homes can still use the in-car Schedule setting to begin charging at 10am or 11am, ensuring the car pulls directly from solar production during the peak window.
Which EVs support bidirectional charging and vehicle-to-home in California?
As of 2026, the Ford F-150 Lightning with the Ford Intelligent Backup Power option exports up to 9.6 kW to a home. The Chevy Silverado EV and GMC Sierra EV export up to 10.2 kW via PowerBase. The Kia EV6 and Hyundai Ioniq 5 and 6 support V2L (vehicle to load) at up to 3.6 kW through an adapter, which can power appliances but not a full home panel. The Nissan Leaf supports V2H via CHAdeMO in the US but CHAdeMO infrastructure is declining. Tesla vehicles do not currently support V2H in the United States, though Tesla has stated it is evaluating the feature. Most California utilities including SCE are running V2G pilot programs with Ford and GM.
What EV charger incentives are still available in California in 2026?
The 30% federal ITC applies to EVSE hardware and installation when the charger is installed as part of a solar project, with no dollar cap on the credit. SCE's Charge Ready Home program offers rebates of $500 to $1,000 for qualifying Level 2 EVSE installations in certain income categories and geographic areas. The South Coast AQMD offers EV charger rebates under its AB 118 programs, typically $250 to $500 per charger for residential installations in the South Coast Air Basin, which includes Temecula. The federal 30C Alternative Fuel Vehicle Refueling Property Credit also applies at up to $1,000 for residential EVSE independent of solar. Check aqmd.gov and sce.com for current program availability and income qualifications.
What is the combined payback when you stack solar savings and EV fuel savings?
A Temecula homeowner replacing a 28mpg gas car with a Tesla Model Y and adding solar sees two separate savings streams stack. Eliminating gas for 12,000 annual miles at $4.50 per gallon saves roughly $1,929 per year in fuel. A correctly sized solar system reducing the SCE bill from $320 per month to the minimum connection charge saves roughly $3,600 per year. Combined annual savings exceed $5,500. Against a net system cost of $22,000 to $28,000 after the 30% ITC, the combined payback period runs 4 to 5 years, significantly shorter than sizing solar for the home alone. The math improves further each year SCE raises rates and gas prices increase.
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