Do you need a panel upgrade for an EV charger in Sacramento?

Written and checked by the DuloCore research team · Last verified: November 11, 2026

Do you need a panel upgrade for an EV charger in Sacramento? Often not: SMUD says an upgrade "is most often not necessary" (SMUD panel fact sheet). This page explains how an electrician decides, and the cheaper alternatives SMUD pays toward. For the overall picture, start at the Sacramento EV charger installation home page.

How the load calculation works

A panel has a fixed capacity, usually printed on the main breaker (for example 100, 125 or 200 amps). An electrician adds up what the house already draws and checks whether a new EV circuit fits. EV charging is treated as a continuous load, so the breaker has to be at least 125% of the charger's maximum draw; that is why a 32-amp charger sits on a 40-amp breaker. In unincorporated Sacramento County a written load calculation that includes 125% of the EV load is required with the permit whenever the service panel is rated 125 amps or less (Sacramento County EC-07). Smaller, older services are where the answer is most often "tight."

Start by sizing the charger to your driving

SMUD's panel fact sheet suggests asking how far you drive each day, whether you can charge at work, and how much you can add between midnight and 6 AM. A 16-amp charger on a 20-amp breaker adds about 75 miles overnight; SMUD's recommended 32-amp charger on a 40-amp breaker adds about 150 miles; and higher-amperage chargers make an upgrade more likely (SMUD panel fact sheet). A smaller charger is often the cheapest way around a full panel.

Circuit sharing devices

If you have an electric dryer or another 240-volt outlet in the garage, a circuit sharing device lets the dryer and charger share that circuit: when the dryer runs, it gets the power, and when it stops, the charger does. SMUD says typical output is about 25 amps, about 115 miles between midnight and 6 AM, and the same idea can share one circuit between two chargers (SMUD panel fact sheet). SMUD's qualified list includes the NeoCharge Smart Splitter (plug-in, indoor use) and the SimpleSwitch 50-amp energy management device (hardwired), and SMUD pays up to $200 toward an eligible device (SMUD device list, updated 10/26/26 (checked Nov 11, 2026)).

Energy management devices

An energy management device watches the whole house. SMUD describes models that cut power to the charger when household use reaches 80% of panel capacity and restore it when use drops, so the main breaker never trips (SMUD panel fact sheet). They must be installed by a qualified electrician. EnergySage puts a load management installation at around $1,200 (EnergySage (accessed Nov 11, 2026)), and the same up to $200 SMUD device rebate applies if the model is on SMUD's list (SMUD Charge@Home terms (checked Nov 11, 2026)).

When a panel upgrade is the answer

The figures differ because they describe different jobs: This Old House prices the panel swap, while EnergySage's service upgrade figure covers a larger job that raises the home's service capacity. Money help is thin here. Charge@Home's terms cover the charger, a sharing or management device, and the circuit, not panel work (SMUD terms). SMUD's free EAPR install excludes panel upgrades (SMUD EAPR page). SMUD's Go Electric rebates exclude projects that increase panel size from the like-for-like rebates, and the federal panel credit applied only to panels installed by December 31, 2025 (SMUD Go Electric). If you do upgrade, the County lets the panel upgrade be included in the EV permit submittal; see EV charger permits, and compare the rebate details on the SMUD rebate page.

Sources

1. SMUD, EV charging and your electrical panel (fact sheet): https://www.smud.org/-/media/Documents/Going-Green/EVs/EV-Charging-Panel-Fact-Sheet.ashx (accessed Nov 11, 2026)
2. Sacramento County, EC-07 Residential EV charging station submittal list (last update 5/2023): https://development.saccounty.gov/content/dam/cd/building/docs/transition/EC-07%20Electric%20Vehicle%20Charging%20Station.pdf (accessed Nov 11, 2026)
3. SMUD, Circuit sharing / energy management device list (updated 10/26/26): https://www.smud.org/-/media/Documents/Going-Green/EVs/Circuit-Sharing-Device-QPL.ashx (accessed Nov 11, 2026)
4. EnergySage, EV charger installation guide (updated Oct 20, 2025): https://www.energysage.com/ev-charging/install-a-home-charging-station/ (accessed Nov 11, 2026)
5. SMUD, Charge@Home Terms & Conditions: https://www.smud.org/Going-Green/Electric-Vehicles/Charge-at-Home-application-page/Charge-at-Home-Terms-and-Conditions (accessed Nov 11, 2026)
6. This Old House, Cost to upgrade an electrical panel (updated Mar 31, 2026): https://www.thisoldhouse.com/electrical/cost-to-upgrade-electrical-panel (accessed Nov 11, 2026)
7. SMUD, EV charger & installation for income-eligible customers: https://www.smud.org/Going-Green/Electric-Vehicles/Charge-at-Home-application-page/EV-charger-and-installation-EAPR (accessed Nov 11, 2026)
8. SMUD, Go Electric rebates: https://www.smud.org/Rebates-and-Savings-Tips/Improve-Home-Efficiency/Go-Electric-rebates (accessed Nov 11, 2026)