Know Before You Install. Check Your Panel in 2 Minutes.
This calculator does the California code math for you. No electrical background needed — just answer a few questions about your home.
⏱ About 2 minutes📋 No expertise required📐 Based on CEC 220.83(A)
Step 1 of 4 — Panel size
What is your main breaker size?
?Your meter-main combo is the metal enclosure on the exterior of your home where the utility meter is mounted. Open the cover — the main breaker is inside, and the amperage is printed directly on the breaker itself.
Please select your main breaker size to continue.
Home square footage
?Livable area only. CEC 220.83 calculates the general lighting and receptacle load at 3 watts per square foot.
Please enter your home's square footage.
Check all that apply in your home:
Kitchen
Kitchen circuits
3,000 W
Electric oven
2,000 W
Electric stovetop
5,000 W
Microwave
1,500 W
Garbage disposal
1,000 W
Dishwasher
3,500 W
Garbage compactor
1,000 W
Instantaneous hot water at sink
1,500 W
Laundry
Laundry circuit
1,500 W
Electric clothes dryer
4,500 W
Heating & Air Conditioning
Central heating (gas) & A/C
6,000 W
Window-mounted AC
1,000 W
Whole-house or attic fan
500 W
Central electric furnace
8,000 W
Evaporative cooler
500 W
Other loads
Electric water heater (storage)
4,000 W
Electric tankless water heater
15,000 W
Swimming pool or spa
3,500 W
EV Charger circuit
Which charger are you installing?
Select your brand. Not sure? Choose Other.
Select your dedicated circuit breaker size
This is the breaker dedicated to the EV charger circuit — not your main breaker.
Please select your EV charger to continue.
Charger load confirmed0 W
Total watts used0 W
Your results are ready. Enter your details below to view your full load calculation and eligibility determination.
First name
Required.
Last name
Required.
Email address
Enter a valid email address.
By submitting, you agree to ElectriCare's Privacy Policy. Your information is used only to deliver your results and follow up on your inquiry. We do not sell your personal data.
Results are estimates based on CEC 220.83(A) typical load values. Actual loads may vary. Consult a licensed electrician for a definitive assessment.
Serving Temecula, Murrieta, Menifee, and Southwest Riverside County. All permits handled — no coordination required on your end.
Whether you need a panel upgrade depends on your home's total electrical load — not just your panel size.
California Electrical Code 220.83(A) sets the rules. Your total wattage — lighting, appliances, and the EV charger you're adding — determines the minimum panel size required. If your existing main breaker meets that threshold, no upgrade is needed. If it falls short, a panel upgrade must happen first.
The calculator above walks through that exact math. It uses the same load table electricians use — and it only takes a couple of minutes to complete.
FAQ
Common questions about panel upgrades and EV chargers
Do most homeowners need a panel upgrade?
Many homes with 200A or 400A service and a moderate load can add a Level 2 charger without any panel work. Homes with 100A service or high-draw appliances — electric furnaces, tankless water heaters, pools — are more likely to fall short. Run the calculator above to check your specific situation in about two minutes.
How long does a panel upgrade take?
Most upgrades take 4–8 hours. When combined with EV charger installation, ElectriCare schedules both scopes in a single visit wherever possible — minimizing time on-site and permit coordination.
Is a permit required for EV charger installation in California?
Yes — both Level 2 EV charger installations and panel upgrades require permits in California. ElectriCare pulls all required permits as part of every job. Without a permit, your homeowner's insurance may deny claims related to the charger, and you may face complications when selling your home.
Is this calculation accurate enough to rely on?
It's a solid starting point based on California code. The load values used are standard CEC estimates. If you're close to a threshold, or have unusual appliances not in the list, an on-site assessment by a licensed electrician is the right next step. Contact ElectriCare for a free evaluation.
What if my total load exceeds 123,000 watts?
The CEC 220.83(A) simplified method no longer applies above 123,000W. A licensed electrician must perform a complete load analysis per code. Contact our team — that's exactly what we handle.
Ready to get your EV charger installed?
ElectriCare handles the full scope — load assessment, permits, panel upgrade if needed, and installation. Serving Temecula, Murrieta, Menifee, and Southwest Riverside County.