EV Charger Panel Upgrade in Sacramento
The car arrives in three weeks and the electrician says the panel will not take it. Sometimes that is true. Often it is only true of the charger you happened to pick. Here is what a Level 2 charger actually asks of your service, where SMUD’s rebate quietly draws the line, and the two cheaper routes worth ruling out before anyone quotes you for a service upgrade.
Charger size, breaker size, and SMUD’s rebate line
What a Level 2 charger actually asks of your panel
A Level 2 charger is not one thing. The range runs from roughly 16 amps at the entry level to 48 amps at the top of the domestic market, and the difference between those two numbers decides whether this is a morning’s work or a service upgrade.
Two rules do most of the damage:
- EV charging is a continuous load. Under Article 625 of the National Electrical Code, the circuit is sized at 125% of the charger’s maximum draw. A 32-amp charger needs a 40-amp breaker. A 48-amp charger needs a 60-amp breaker. You do not get to count the charger at its face value.
- Your service has less in it than the number on the door. The same continuous-load thinking means a 100-amp service is worked to 80 usable amps. That is the figure your electrician is actually working with.
What do you get for the extra amps? Roughly: an entry-level 16 to 24-amp charger adds something like 100 to 150 miles overnight. A 32-amp charger adds 200 to 300. A 48-amp charger charges faster than that, and if the car sits on the drive for nine hours every night, faster than what you actually needed.
This is the question worth answering before you buy the charger rather than after: how many miles do you drive on a normal day, and how many hours is the car parked at home? A great many Sacramento households are buying a 48-amp charger, and a service upgrade to go with it, to solve a problem they do not have.
Will your existing service take it?
Take a common Sacramento house: 100-amp service, central air, an electric dryer, an ordinary kitchen. Work it through the way an electrician would:
| Item | Amps |
|---|---|
| 100-amp service, at 80% continuous | 80A usable |
| Air conditioning | − 15A |
| Electric dryer | − 22A |
| Kitchen and lighting circuits | − 15A |
| Left for a charger | ≈ 28A |
Twenty-eight amps takes an entry-level charger comfortably. It does not take a 48-amp unit, and it certainly does not take one alongside a heat pump arriving next year. That single line of arithmetic is behind most of the “you will need an upgrade” conversations happening in Sacramento garages right now.
Your own numbers will differ — gas heating and gas water heating leave more room, an older house with a 60 or 70-amp service leaves almost none. The full version of this calculation, and what a service upgrade involves here, is on our 200-amp panel upgrade page.
Empty breaker slots are not spare capacity. A panel can have four free spaces and no amps left to give. The two questions are unrelated, and it is worth knowing that before someone points at the empty slots as reassurance.
SMUD’s rebate quietly sets the ceiling at 32 amps
This is the part almost nobody mentions, and it can change which charger you buy.
SMUD’s Charge@Home programme advertises rebates of up to $600 towards EV charging equipment and circuit work. Read the terms and conditions and the money breaks down into parts, each with its own cap:
| What SMUD is paying for | Up to |
|---|---|
| The EV charging unit itself | $100 |
| A circuit sharing or energy management device | $200 |
| Installation, through SMUD’s own contractor network | $500 |
And the equipment specification is specific in a way that matters. To qualify, the charger must:
- Supply up to 32 amps maximum (7.7 kW), on a circuit served by a maximum 40-amp breaker
- Use wire no larger than #8 copper
- Use a J1772 or NACS/SAE J3400 connector
- Be ENERGY STAR certified, UL or equivalent listed, with a minimum three-year warranty
Buy the 48-amp charger and you are outside every one of those numbers. You lose the equipment rebate, you are usually into a service upgrade to feed it, and you have spent thousands to shorten a charge that happens while you are asleep.
The rest of the conditions are worth knowing before anyone orders parts. The vehicle must be registered with the DMV at the same address as the SMUD account, in matching names. It must be a four-wheel, light-duty passenger vehicle. Installation must be by a California state licensed contractor, and the application wants a copy of the permit from the building department — so the permit is not optional paperwork, it is part of getting paid. There is a limit of one combined rebate per account and address for the lifetime of the premises, and payment is mailed within one to two weeks of SMUD approving the application.
SMUD states plainly that it can modify or end the programme without notice, so treat any figure on this page as a prompt to check SMUD’s current terms rather than a promise. The terms quoted here were current in September 2026.
SMUD will pay you up to $200 not to upgrade
The $200 line in that table is the most interesting thing in the programme, and it is aimed squarely at houses in your position.
A circuit sharing device lets two appliances share one circuit, with only one able to draw at a time. The classic arrangement is an EV charger sharing the electric dryer’s circuit — the dryer runs, or the car charges, never both. An energy management system does something cleverer: it watches the whole house and throttles the charger down when the air conditioning and the oven are both running, then lets it back up later.
Either way the charger is fed from capacity you already have, and the service stays as it is.
SMUD publishes a qualified product list for these devices — last updated 6 May 2026 — and it currently names:
- NeoCharge Smart Splitter — plug-in, UL certified, two-year warranty, indoor use only, which rules it out for a lot of Sacramento side-of-house installations
- Simpleswitch 50-amp Energy Management Device — hardwired, UL certified, with a long manufacturer warranty
- SolarEdge EV charging units, for homes integrating solar or battery storage
The device must be new, first-time installed, safety certified by a nationally recognised testing laboratory, and its maximum output must not exceed the specification of the existing circuit.
Why would a site that connects you with electricians tell you how to avoid a job? Because it is still an electrician’s job — a permit, a licensed install, an inspection — and because the households who genuinely cannot avoid the upgrade are better served by an electrician who ruled out the cheap answer first. If the $400 fix works for you, you were never going to be happy about the $5,000 one.
The metered-data route, and why electricians call it a test of patience
There is a third way through, and it is written into the code rather than sold by anyone.
Instead of calculating a theoretical load from a worksheet, an electrician can use what your house has actually drawn, measured by the smart meter. California’s service-optimisation guidance for building officials sets out the conditions: a year of hourly data, or 15-minute data over a minimum of 30 days as an exception, taking 125% of the maximum demand recorded, on a home with no renewable system installed. The guidance cites California households that fully electrified — EV charging included — on their existing service by this route.
Electricians on trade forums are relaxed about the method itself. Asked whether there is any reason it cannot be used to show an existing service will carry an EVSE, the answers are flat: “I have done that.” “No, there is no reason it can’t be used.”
The friction is entirely in getting the numbers out of the utility. One electrician describes the common problem: some utilities hand over 15-minute demand figures, others will only give 15-minute usage in kilowatt-hours, which has to be multiplied by four to get back to demand — a conversion he reports being told was wrong, adding that when he does the maths, it is correct. The practical method is unglamorous: download a year of usage, open it in a spreadsheet, sort the column high to low, read the top of it.
His summary of the whole exercise: obtaining the actual demand history is “a test of patience.”
Worth knowing, then, that the route exists and that the obstacle is administrative rather than technical. Worth knowing too that the City of Sacramento’s own submittal worksheet is built around the conventional calculation — Form CDD-0213 references the 2022 California Electrical Code 220.82 method — so if you want the measured-demand argument made, it is a conversation to have with your electrician at the start, not a box on a form.
The permit — and the one case where you do not need one
Start with the exception, because it saves some people several hundred dollars. The City of Sacramento’s EVSE guide is explicit: if the home already has a suitable 240-volt outlet and the charger simply plugs into it, a building permit is not required. A surprising number of Sacramento garages built for an electric dryer or a workshop already have one.
Everything else needs a permit. In the city’s own words, a building permit is required for all new installations and modifications of electrical panels and electrical outlets.
And an EV charger circuit is not the quick version of a permit. A new electrical circuit is normally minor permit work in the city, but the minor-permit list carries an explicit exception: new EV charger circuits require a plan review submittal. So this is a submittal with drawings, not a counter formality. What your contractor submits is:
- Cut sheets for the charging equipment
- Load calculations on Form CDD-0213, the Electrical Load Calculation Worksheet, showing the load calculation for the electrical service
- A site plan showing the house on the lot, the service, and where the EVSE goes
- A one-line diagram giving the service size, the EV breaker size, and the conductor size and count
Two things follow from that list. First, the load calculation is not a formality an electrician can skip — the permit will not issue without it, which is why a competent contractor asks about your panel before quoting rather than after. Second, if you are claiming the SMUD rebate you need a copy of that permit anyway, so unpermitted work costs you the rebate on top of everything else it costs you at resale.
Outside the city limits, the counter changes. Sacramento County has its own Building Permits and Inspection Division, and Elk Grove, Folsom, Rancho Cordova and Citrus Heights run their own. The requirements are broadly similar; the forms and the queue are not.
What EV charger work costs in Sacramento
These are the ranges homeowners here commonly report and that Sacramento electricians publish on their own sites. They are context for reading a quote — not a quote, and not an offer.
| Scope | Typical Sacramento range | What drives it |
|---|---|---|
| Level 2 charger on a new circuit, panel has capacity, short run to an attached garage | $600 – $1,400 | The simplest case. Distance from the panel is most of the price. |
| Long run, exterior wall, trenching to a detached garage or carport | $1,500 – $3,500 | Trenching, conduit, stucco or siding repair. |
| Load-sharing device fitted to an existing circuit | $300 – $700 | Device plus a short install. May qualify for SMUD’s $200. |
| Smart charger with whole-home throttling | $500 – $900 | Equipment cost; the install is usually the simple case above. |
| Sub-panel added for a garage or workshop | $1,200 – $3,000 | Solves a shortage of slots, not a shortage of amps. |
| Upgrade to 200A with new meter-main combination | $3,500 – $6,500 | The full service change, with SMUD coordination and an outage. |
Where EV quotes go wrong on the day
The charger is rarely the surprise. What moves a quote is the distance from the panel to where the car parks, whether the route is through a finished wall or an attic in August, and whether anyone looked at the service size before promising a 48-amp unit. If a quote arrives without a load calculation having been mentioned at any point, that is the thing to ask about. Our panel cost page has the full checklist for reading a quote.
If a service upgrade does turn out to be necessary, do it once. One permit, one outage, one round of SMUD coordination, one set of repairs to the wall. Doing the panel now and the charger in the spring means paying for the mobilisation twice — and SMUD’s own published guidance is that a meter set typically follows within seven business days of inspection approval, so the second visit is not a quick one either.
Common questions
Can I just plug the charger into the dryer socket?
Not by swapping the plug over yourself, no — but the supervised version of that idea is exactly what a listed circuit-sharing device does, and SMUD will contribute up to $200 towards one. The device makes sure the two loads can never draw at once, which is the part an extension lead and good intentions cannot do.
Is a 48-amp charger worth it?
For most households, no. It is worth it if you drive high mileage, run two EVs off one charger, or have a genuine need to add a lot of range in a short window. For a car that sits at home from seven in the evening until seven in the morning, a 32-amp unit refills a normal day’s driving several times over — and it stays inside SMUD’s rebate specification, on a 40-amp breaker, usually without touching the service.
Does the charger have to go next to the panel?
No, but every foot costs. The panel is often on the opposite side of the house from where the car parks, and the run — through a wall, round the outside, or trenched to a detached garage — is frequently more than half the bill. If you have any flexibility about where the car parks, walk the route with the electrician before deciding.
Will charging overnight save me money?
SMUD’s standard residential rate is a time-of-day rate, so when you charge changes what it costs. The peak hours and the rates themselves change, so check SMUD’s current residential rate page before setting the car’s charging schedule — and then actually set it, because most cars will happily charge the moment you plug in otherwise.
How long does the whole thing take?
If the service has capacity, the install itself is a day’s work plus the inspection — though the charger circuit needs a plan review submittal rather than an over-the-counter permit, so allow for that at the front. If a service upgrade is involved, the timeline stops being about the electrician: SMUD sets the meter only after inspection approval, and their published guidance is that the work is typically completed within seven business days of that approval. SMUD’s own public complaint record shows the unhappy tail of that distribution too, which is why an electrician who chases the utility is worth more than one who files the paperwork and waits.
My panel is a Federal Pacific or Zinsco. Does that change things?
Yes, and it moves this from an EV question to an insurance one. No electrician should be adding a 40-amp circuit to a Stab-Lok panel, and your carrier is likely to have its own view of the panel regardless of the car. There is a full account of what those panels are, what insurers do about them, and what replacement involves on our FPE and Zinsco replacement page.
Find out what your service will actually take
Tell us what charger you are looking at and what panel you have — a photo of the panel label is the single most useful thing you can send. We will connect you with a CSLB-licensed C-10 electrical contractor covering your address. There is no charge to you, and no obligation to proceed.
Last reviewed September 2026. SMUD programme terms, rates, permit rules and timings all change — this page is dated so you can see how current it is.
About this service. Sacramento Electrical Panel is a free referral service that connects homeowners with independent, CSLB-licensed electrical contractors. We are not a licensed contractor, we do not perform electrical work, and we do not provide quotes, estimates or contracts for electrical work. Any price you are given comes from the contractor directly, and any contract you sign is between you and that contractor.
Cost ranges on this page are general information about the Sacramento market and are not an offer or an estimate. Rebate terms are summarised from SMUD’s published programme documents and may change at any time — confirm current terms with SMUD before relying on them. Always verify a contractor’s licence status and classification at cslb.ca.gov before signing anything or paying a deposit.