Field guide · free to read

You need a panel upgrade for your EV charger. What does that mean?

Somebody has quoted you for one and the number was larger than you expected. This page is about what is actually in that scope, how to compare two quotes that are thousands apart, and the sequencing decisions that cost the most when they are made in the wrong order. If you are not yet sure you need one, start with the load calculation instead.

By Branden Husted · qualifying contractor on Sunrise’s CSLB-licensed C-10 (Electrical) classification, license #C10-1097237

Published August 3, 2026 · Last reviewed August 6, 2026

About this article

Author: Branden Husted — qualifying contractor on Sunrise’s CSLB-licensed C-10 (Electrical) classification, license #C10-1097237, Founder, Sunrise Electrical Contracting Inc.

Published: August 3, 2026 · Last reviewed: August 6, 2026

Sources: NEC Article 220 — branch-circuit, feeder and service load calculations, including the 220.82 optional method for a single dwelling · California Electrical Code (Title 24, Part 3) — 2025 edition, effective January 1 2026 · Santa Cruz County Building Division — permit authority

Editorial standards: /editorial-standards · Corrections: /corrections-policy

Conflict of interest: Sunrise provides the services this guide describes; we have a financial interest in some recommendations. We mitigate this with the editorial standards linked above.

Quick answer — the 30-second version

A panel upgrade is not a box swap. Every main panel job is a full electrical service rebuild: service entrance conductors, combination meter main, grounding and bonding, new panel and breakers, surge protection, permit and inspection.
That is why quotes vary so widely. A cheaper one is often a smaller scope, with the rest arriving later as a change order. Compare scope line by line, not totals.
Do the charger at the same time. The two jobs share a mobilisation, a permit and an inspection, and the charger circuit is trivial to run while the power is already off.
Run the calculation on everything you intend to add, not just the charger. Upgrading for a charger and then finding a heat pump does not fit is the most common expensive mistake here.

03·The full explanation

What you are actually buying

The phrase panel upgrade is misleading, because it points at the one component people can see. What the work actually does is rebuild the electrical service — the path from the utility's conductors to the breakers in your house — and bring the whole of it to current code. The panel is the last item on that list rather than the substance of it.

Every main panel job we do includes the same scope, whether it is a 100 to 200 amp upsize or a like-for-like replacement at the same amperage:

SERVICE ENTRANCE CONDUCTORS — the cable carrying the full service current into the building, sized for the new service
COMBINATION METER MAIN — the integrated enclosure holding the meter socket, the main disconnect and the distribution. There is no separate meter base in California residential work; it is all one unit
GROUNDING AND BONDING — brought to current code, and the part most often found wanting in an older home
MAST AND WEATHERHEAD on an overhead service. On underground there is neither — the utility conductors come to a service point and terminate inside the combination meter main
THE PANEL AND BREAKERS themselves, plus a whole-house surge protector
PERMIT AND INSPECTION COORDINATION, and the utility disconnect and reconnect

We do not quote a panel-only version of a main panel, because on a main panel there is not really one. Saying so plainly matters here, since the next section is about quotes that imply otherwise.

How to read two quotes that are far apart

Panel upgrade quotes routinely differ by a large margin, and the difference is usually scope rather than margin. Comparing totals tells you almost nothing. These are the questions that make two quotes comparable:

Does it include the SERVICE ENTRANCE CONDUCTORS, or only the panel? This is the single biggest silent difference
Does it include the COMBINATION METER MAIN? If a quote itemises a separate meter base, ask about it — that is not how California residential services are built, and it suggests the quote was written from a template rather than from your house
Does it include GROUNDING AND BONDING to current code, or does it assume the existing grounding electrode system is adequate?
Is the PERMIT and the inspection coordination in the price, or extra?
On UNDERGROUND: what happens if PG&E rejects the existing conduit? A quote silent on this is a quote with an open-ended cost sitting inside it
Is the EV CHARGER CIRCUIT included, or a separate visit?
What WARRANTY covers the workmanship, and for how long?

None of this is about catching anybody out. Plenty of contractors quote a narrower scope entirely honestly, because that is genuinely the job they are proposing. The problem is only that two documents with different scopes and similar titles get compared on price, and the narrower one wins the comparison and then costs more by the end.

Do the charger at the same time

If there is one piece of practical advice on this page, it is this. A panel upgrade and a charger install share almost all their overhead: the same trip, the same permit process, the same inspection, the same day without power. The charger circuit itself is a straightforward run while the panel is open and dead.

Splitting them across two visits months apart means paying for that overhead twice, and it occasionally produces a worse result — a panel laid out without the eventual charger circuit in mind, or a conduit route that would have been trivial during the rebuild and is awkward afterwards. If budget is the reason for splitting them, say so, because that is a financing conversation rather than a sequencing one.

Size it for the plan, not for the charger

The most expensive version of this work is doing it twice. It happens like this: the service gets upgraded to carry a charger, sized against the house as it is today plus the charger. Eighteen months later a heat pump goes in, or an induction range, or a heat-pump water heater, and the calculation comes back short.

Adding your intended future loads to the load calculation costs nothing at the quoting stage. It sometimes changes the answer, more often it changes the SEQUENCE — which order to do things in, and whether a sub-panel now saves a service change later. Either way it is information you want before signing rather than after. If you are not sure what you will add, guessing generously is cheaper than guessing conservatively.

What happens on the day

Most of these are a single day. PG&E disconnects the service in the morning; we remove the old equipment and rebuild — conductors, combination meter main, grounding and bonding, panel, breakers, surge protection; the AHJ inspects; PG&E reconnects. Circuits get re-landed and labelled properly, which on an older panel is frequently the first time the labelling has been accurate in decades.

You are without power for the working portion of the day. Worth planning around if somebody works from home, if there is medical equipment in the house, or if a freezer full of food would be a problem. Say so when booking rather than on the morning — occasionally it changes how we stage the work.

The panel we fit is Siemens unless you ask for another brand, and breakers always match whichever panel goes in. That is not brand preference for its own sake: a breaker from a different maker that physically clips onto the bus is not a listed combination, and the UL listing applies to the assembly rather than to the parts separately.

When the answer is not an upgrade

Worth stating, because a page about panel upgrades has an obvious bias. Sometimes the right answer is no upgrade at all. Load management can let a charger share an existing service safely. A lower-amperage charger is often perfectly adequate — most people drive far less than they plan for, and an overnight charge at a modest rate covers a normal week comfortably. A sub-panel occasionally solves a distribution problem that looked like a capacity problem.

The load calculation is what distinguishes these cases, and if it says your existing service is fine then that is a real answer and one worth having in writing. Anyone recommending an upgrade without having run the numbers is guessing, and it is entirely reasonable to ask to see the calculation.

04·Is this you?

Two ways to check. Both take a minute.

Checklist · tap what’s true

Check what applies. This mostly decides how wide the scope of your job is, not whether you need one.

Or — show us a photo

A photo of the panel with the cover ON, the label showing the main breaker rating, and one of where the service enters the building tells us most of what sets the scope. Do not remove the cover.

Email us a photo

A clear photo of the panel and the brand label is enough — JPG, PNG or HEIC.

06·Pricing transparency

Every quote is free. The range depends too much on your home to fake it.

We do not publish a figure for this, because the honest range depends on things nobody can see from a description — overhead versus underground, whether existing conduit is reusable, whether the panel moves, and which AHJ issues the permit. What is consistent is the scope: every main panel job is a full service rebuild including the service entrance conductors, the combination meter main, grounding and bonding, the new panel and breakers, a whole-house surge protector, permit and inspection coordination, and the 20-year workmanship warranty. We quote the exact number in writing after a free look. Cost ranges are pulled from real Santa Cruz County job data at render, not made up here.

Financing · GoGreen Home

This is one of the cases where GoGreen Home financing genuinely applies: it covers panel work tied to a qualifying energy-efficiency upgrade, and an EV charger is one of them. The same panel upgrade done on its own would not qualify. Worth confirming against your specific job rather than assuming, and we go through it with the quote.

Pre-qualify in 60 seconds — no credit impact

What it costs

Quotes are free.The variance on this work is too wide for an honest range — book a free inspection and we’ll give you a real number for your specific home, in writing.

What moves the number

Overhead versus underground service · Underground: existing 2"+ conduit reusable, or new conduit trenched · Whether the panel stays in place or is relocated · Distance and route from the panel to the charger location · Which AHJ issues the permit (Santa Cruz, Capitola, Scotts Valley, Watsonville, or unincorporated County) · Coastal corrosion-zone hardware for homes near the ocean · Whether future loads are being provisioned for at the same time

No hidden fees. Every quote is free and detailed.

07·What to do next

When you’re ready

Pin the scope down before you compare any prices.

Ask every contractor the same five questions: does the price include the service entrance conductors, the combination meter main, and grounding and bonding to current code; is the permit in it; and what happens if the utility rejects the existing underground conduit. Then run the load calculation against everything you intend to add over the next several years, not just the charger. Those two steps decide almost everything about how this job goes.

Schedule a free inspection Request a quote

08·Even if Sunrise isn't the answer

Here’s the honest path — wherever it leads.

We'd rather you get the right outcome than the Sunrise outcome. Some of this points away from us on purpose.

Not sure you need one yet?

The load calculation decides it, and plenty of homes take a Level 2 charger without any service change. Start there rather than here.

Will my panel support an EV charger?

Get the scope and the number in writing

A free inspection covers the panel, the service and a load calculation against your whole plan — including the loads you are only considering. You keep the written assessment either way.

Schedule a free inspection

Outside Santa Cruz County?

Find a CSLB-licensed C-10 contractor and verify at cslb.ca.gov. Take the scope questions above with you — they work on any quote, anywhere, and they are the difference between comparing prices and comparing jobs.

10·Frequently asked questions

14 questions. Real answers.

The questions readers actually ask about this specific problem, answered in full.

Why does a charger need a whole new panel?

Usually it does not need a new panel so much as a bigger service, and the panel is the visible part of that. A Level 2 charger is a large continuous load that the code counts at 125 percent, and on a service that was sized decades ago for a gas house there is often no room for it. The work is not really about the box on the wall — it is about the capacity coming into the building, which is why the scope covers the conductors and the meter main as well.

What is actually included in a panel upgrade?

For us, always the same list: the service entrance conductors, the combination meter main, grounding and bonding brought to current code, the new panel and breakers, a whole-house surge protector, permit and inspection coordination, and the workmanship warranty. On an overhead service the mast and weatherhead are part of it too. Anyone quoting a materially shorter list is quoting a materially different job.

How do I compare two quotes that are far apart?

Line by line, on scope rather than on the total. Ask each contractor whether the price includes the service entrance conductors, the combination meter main, and the grounding and bonding, or only the panel. Ask whether the permit and the utility coordination are in it. Ask what happens if the utility rejects the existing underground conduit. A cheaper quote is often a smaller scope with the remainder arriving later as a change order.

Should I do the charger at the same time?

Almost always, yes. The two jobs share a mobilisation, a permit process and an inspection, and the charger circuit is trivial to run while the panel is already open and the power is already off. Doing them months apart means paying twice for the overhead and, occasionally, discovering that the panel that got installed was not laid out for the circuit you now want.

Do I have to go to 200 amps?

Not automatically, though it is the common landing point. A load calculation might show that a smaller increase covers your plans, and in some homes a like-for-like replacement plus load management on the charger is a legitimate answer. What makes 200 amps the usual choice is not the charger on its own — it is that most people adding a charger are also thinking about a heat pump or an induction range within a few years, and the incremental cost of the larger service at the time of the work is far smaller than doing it twice.

What is load management and does it change the answer?

A load-management device prevents the charger and another large appliance from drawing at once, which lets a charger share a service that could not otherwise carry it. It genuinely works and it is sometimes the right answer, particularly where the alternative is a trenched underground service upgrade. The trade-off is that the charger occasionally throttles or pauses while something else runs, which most people never notice on an overnight charge and some people find unacceptable. The load calculation tells you whether it is even on the table.

How long does it take and will I lose power?

Most main panel jobs are a single day. PG&E disconnects at the start, we rebuild the service, the AHJ inspects, and PG&E reconnects. You are without power for the working portion of that day, which is worth planning around if somebody works from home, there is medical equipment in the house, or you have a freezer you care about.

My service is underground. Does that change the job?

It changes its shape and its risk. There is no mast or weatherhead underground — the utility conductors come to a service point and terminate inside the combination meter main. A like-for-like still needs PG&E to disconnect and reconnect at the splice. On an upsize the largest single variable is whether the existing conduit is two inches or larger and reusable, or whether new conduit has to be trenched. We assess the visible conduit when quoting, PG&E verifies it after contract, and if they require new conduit we requote rather than absorb it quietly or spring it on you mid-job.

Does the panel need to be in the same place?

Usually it stays put, and moving it is one of the bigger cost variables when it does not. Sometimes there is a good reason — a panel in a closet or a bathroom, or one that has ended up behind a later addition, or a location that makes the charger run unreasonably long. Worth raising early rather than discovering after the quote, because relocation changes the conductor routing and often the trenching or mast work as well.

Will the upgrade cover a heat pump later?

That depends on what the calculation says with the heat pump included, which is why it is worth running the numbers on everything you intend to add rather than only on the charger. This is the single most common expensive mistake we see: a service upgraded for a charger, then a heat pump eighteen months later that does not fit in what was left. Adding the future loads to the calculation costs nothing at the quoting stage.

Which panel do you install?

Siemens, for both main panels and sub-panels, unless you ask for something else — in which case we will fit what you ask for. Breakers always match whichever panel goes in, because mixing makers voids the UL listing of the assembly regardless of whether another maker's breaker physically clips onto the bus.

Do I need a permit?

Which authority issues one depends on your address rather than on the work: the City of Santa Cruz, Capitola, Scotts Valley and Watsonville each run their own, and everything unincorporated goes through County Planning. Live Oak, Pleasure Point, Soquel, Aptos and Felton are all unincorporated county despite the mailing address. Where a permit applies to work we do, we pull it and coordinate the inspection.

Does financing apply to this?

This is one of the cases where it genuinely does. GoGreen Home financing applies when panel work is tied to a qualifying energy-efficiency upgrade, and an EV charger is one — so a panel upgrade being done to enable a charger normally qualifies where the same upgrade on its own would not. Worth confirming for your specific job rather than assuming, and we will go through it with the quote.

Can I get a rebate for the charger?

Programmes for EV charging change and vary by utility and by year, so the honest answer is that it is worth checking what is current at the time you do the work rather than trusting anything written on a page months earlier. We will tell you what we know of at quoting time. What we will not do is put a number on this page that might be stale by the time you read it.

11·About the author

Written by

Branden Husted · qualifying contractor on Sunrise’s CSLB-licensed C-10 (Electrical) classification, license #C10-1097237

This guide was written by Branden Husted, owner of Sunrise Electrical Contracting. Branden is the qualifying contractor on Sunrise’s CSLB-licensed C-10 (Electrical) classification, license #C10-1097237, and has owned and operated Sunrise since July 2022, serving Santa Cruz County — Davenport to Pajaro Dunes. We replace roughly 15–25 FPE-equipped panels a year and have documentation processes that work cleanly with the major California insurance carriers.

Published August 3, 2026 · Last reviewed August 6, 2026Full profile

Sources

[1]NEC Article 220 — branch-circuit, feeder and service load calculations, including the 220.82 optional method for a single dwelling — Adopted in California through the CEC. EV supply equipment is a continuous load and is counted accordingly.accessed 2026-08-03
[2]California Electrical Code (Title 24, Part 3) — 2025 edition, effective January 1 2026 — 2023 NEC base with California amendments; local AHJs may amend further.accessed 2026-08-03
[3]Santa Cruz County Building Division — permit authority — Unincorporated county, including Live Oak, Pleasure Point, Soquel, Aptos and Felton.accessed 2026-08-03

12·One more thing

Get the scope, then the number.

A free inspection includes a load calculation against everything you plan to add — and a written quote that covers the whole service rebuild rather than the box on the wall.

Schedule free inspection (831) 786-5506 Free inspection