Do You Need a Panel Upgrade Before Installing an EV Charger in Cheyenne?

What a Level 2 Charger Actually Demands from Your Panel

A Level 2 EV charger runs on 240 volts and almost always lands on a 40A to 50A dedicated circuit. The number that matters is continuous load. The National Electrical Code treats anything running for three hours or more as a continuous load, and your circuit has to be sized so that load never exceeds 80 percent of the breaker rating. That is why a 50A breaker only gives you 40A usable for the charger. When a homeowner in Cheyenne tells me their charger draws 40 amps, what they are really telling me is that it needs a 50A breaker and the panel space and service capacity to back it.

On a 100A service panel that already runs central air, an electric dryer, an electric range, and an electric water heater, dropping in a 50A EV circuit can push the total connected demand past what the service was rated to carry. The panel will not necessarily trip the moment you plug in. Panels tolerate brief loads above their rating, which is exactly what makes the problem easy to ignore. What you do not see is the slow damage: breakers weaken from repeated overloads, bus bars and lugs run hotter than they should, and the heat and load cycling shorten the life of the equipment well before its time.

In older 100A panels with aluminum bus bars, the heat issue gets more serious because aluminum expands and loosens at connection points over years of thermal cycling. Adding a high, daily, hours-long EV load to a panel that already lives near its limit is the kind of thing that looks fine on day one and turns into a warm panel cover, a faint smell, or a nuisance trip eighteen months later. The right move is to know the number before you buy the charger, not after.

When 100A Service Is Not Enough

The honest answer to whether 100A is enough is that it depends entirely on the house, which is why a load calculation exists. A 100A panel in a Cheyenne home with a gas furnace, a gas water heater, and only a handful of electric appliances usually has real headroom left for a 50A EV circuit. The same 100A panel in a home with central air conditioning, an electric dryer, and a heat pump water heater has very little room to spare, and a fourth or fifth large electric load tips it over. The calculation follows the NEC method, accounting for the largest loads at full value and the rest at the code demand factors, and it gives a real number instead of a guess.

We run that calculation before quoting any EV charger installation, and the result decides the path. If it shows your panel can carry the new circuit safely, we proceed with the charger alone and you spend nothing on a panel you did not need. If it shows the panel is already crowded, we tell you that before any work starts and quote the panel upgrade and the EV circuit together so there are no surprises. The point of the calculation is to take the pressure off the decision. You see the math, you see where your house actually sits, and you choose with real information instead of a salesperson’s hunch. Call (307) 757-5553 and we will get you that number.

The Case for Upgrading to 200A Now

If the load calculation shows your 100A panel is marginal for an EV charger today, the smarter spend is to upgrade to 200A service now rather than wedge the charger in and revisit the panel in two or three years. The reason is simple math on labor. Most of the cost of a panel upgrade is the work of pulling the service, setting the new panel, and coordinating the meter, not the panel itself. When the electrician is already on site running an EV circuit, folding the upgrade into the same visit costs far less than booking two separate projects with two separate mobilizations and two separate permits.

There is also the future to think about. Wyoming homes are adding electric loads every year, whether that is a heat pump, a second EV, a hot tub, a shop heater, or a finished basement. A 200A panel comes with open breaker slots and the service capacity to absorb those additions without another upgrade. A 100A panel that is already maxed by an EV charger has neither, so the next project that needs a circuit starts with a panel conversation all over again. Upgrading once, while the truck is already in the driveway, almost always beats upgrading twice.

The other quiet benefit of a 200A upgrade is that it usually means a brand new panel, new breakers, and clean, properly torqued connections throughout, which is a real reliability gain on a home where the existing panel is decades old. You are not only buying capacity, you are retiring an aging piece of equipment that has been the heart of the home’s electrical system. See our panel replacements page for how we handle that scope, and reach out if you want us to look at what your specific panel can and cannot take.

Permits, Inspections, and Black Hills Energy Coordination in Laramie County

Both a panel upgrade and a new EV circuit require permits and inspections in Laramie County, and that is a feature, not a hurdle. The inspection confirms the work meets the current NEC before anyone energizes it, which is exactly the protection you want on a circuit that will carry a heavy daily load for years. We pull the permit, schedule the inspection, and meet the inspector so the process never lands on your plate. A panel upgrade also triggers utility coordination, because moving a home from 100A to 200A service involves the meter base and the service entrance, not just the panel inside.

Around Cheyenne the residential utility relationship is the piece that most often controls the calendar. Whether your service comes through Black Hills Energy on the natural gas side or Rocky Mountain Power on the electric side, the meter and service-entrance upgrade has to be scheduled with the utility, and their availability typically adds a week or two to the overall timeline. We sequence the project so the inspection clears first, the utility upgrade happens on their schedule, and the EV circuit is ready the moment power is back, which keeps the home from sitting without service any longer than necessary.

The reason we handle all of this in house rather than handing you a stack of forms is that the coordination is where do-it-yourself EV projects usually stall. The wiring is the easy part. Getting the permit, passing inspection, and timing the utility work so it all lands cleanly is where experience pays for itself. See our EV chargers page for the full installation scope, and contact us when you are ready to put a real timeline on your project.

Frequently Asked Questions

How do I know if my Cheyenne home’s panel can handle an EV charger?

Call us for a load calculation. We look at your current connected loads, the panel capacity, and any planned additions, then run the NEC demand calculation to get a real number. We give you a clear answer before quoting the charger installation. Call (307) 757-5553.

What is the difference between a 100A and a 200A panel for EV charging?

A 100A service panel has roughly half the total capacity of a 200A panel, so once your existing electric loads are accounted for there may be little room left for a 50A EV circuit. A 200A panel carries the same household loads plus the charger with capacity and open breaker slots to spare. That extra headroom is what lets you add a heat pump or a second charger later without another upgrade.

Why does a Level 2 charger need a 50A breaker if it only draws 40 amps?

An EV charger that runs for hours counts as a continuous load under the NEC, and continuous loads can only use 80 percent of the breaker rating. A 50A breaker gives you 40A of usable continuous capacity, which is why a 40A charger lands on a 50A circuit. Sizing it any tighter would put the breaker at constant risk of nuisance trips.

Does the utility need to do anything for a panel upgrade in Cheyenne?

Yes. When upgrading from 100A to 200A service, the utility upgrades the meter base and service entrance, and that work has to be scheduled on their calendar. We coordinate that for you, whether the relationship runs through Black Hills Energy or Rocky Mountain Power. The utility scheduling typically adds one to two weeks to the overall project.

Can I install the EV charger now and upgrade the panel later?

Technically yes, but we recommend the load calculation first. If the panel is already close to capacity, adding the EV circuit without headroom creates a real reliability and safety issue down the road. If the calculation shows you have room, then proceeding with just the charger is the right call. Call (307) 757-5553.

What does a panel upgrade plus EV charger installation cost in Cheyenne?

The combined price depends on the service entrance location, the distance from the panel to the charger, and the charger model you choose. Combining both scopes in one project is meaningfully less expensive than scheduling them separately because the labor and permit work overlap. Call (307) 757-5553 for a specific number for your home.

How long does a panel upgrade and EV charger installation take together?

A combined project usually completes in one to two days for the electrical work itself. The utility meter upgrade adds a week or more depending on their schedule, so we sequence the inspection and the utility work to keep the home from sitting without power. We coordinate the full timeline and keep you informed at each step. Call (307) 757-5553 or contact us.

Read more on our EV chargers page, see our project gallery, or learn about the team.