Panel Upgrades & Rewiring
200-amp service upgrades, fuse box replacement and whole-home rewiring, permitted and inspected.
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Residential service
Home EV Charger Installation
A Level 2 charger turns an overnight top-up from a trickle into a full battery. APEX Electric installs hardwired and plug-in EV chargers throughout St. Charles County — Tesla Wall Connectors, ChargePoint, Emporia, Grizzl-E and any universal J1772 unit — on a properly sized dedicated circuit with the permit pulled and the work inspected.
Sizing the circuit correctly
A Level 2 charger is a continuous load, which means the circuit has to be rated for 125% of the charger's draw. A 48-amp charger needs a 60-amp circuit and the conductors to match. Undersized installs are the single most common problem we are called out to correct.
Before we quote, we run a service load calculation on your existing panel. That tells us whether the service can carry the charger outright, whether a load-management device is the smarter answer, or whether a panel upgrade should come first.
Hardwired or plug-in?
Hardwiring supports the highest charge rates and is required outdoors in many jurisdictions. A NEMA 14-50 receptacle is more flexible if you expect to move or change vehicles, and lets you take the charger with you.
We install both. If you go with a receptacle, we use an industrial-grade device — the commodity 14-50 outlets sold for occasional RV use are a known failure point under daily EV load.
When your panel is already full
A full panel does not automatically mean a service upgrade. Load-management devices and energy management systems can share an existing circuit with a dryer or range, or throttle the charger when household demand peaks.
We walk you through the options with real numbers attached, so you can weigh a $600 load-management solution against a full service upgrade rather than defaulting to the more expensive path.
What this covers
- Tesla Wall Connector & universal J1772
- NEMA 14-50 outlets
- Dedicated 40A–60A circuits
- Garage, carport & driveway runs
- Load management when the panel is tight
- Permit & inspection included
Available across O'Fallon, St. Charles, St. Peters, Wentzville and the rest of St. Charles County.
(660) 342-5886QuestionsEV Charger Installation
EV Charger Installation
questions.
The things people ask us most about this work.
Most installs are completed in three to five hours. Longer conduit runs, a detached garage, or a panel upgrade performed at the same time can extend that to a full day.
Yes. A detached structure needs a properly sized feeder and its own grounding electrode system. We handle the trenching or overhead run, the sub-panel and the charger circuit as one project.
Yes — every municipality in the area requires one for a new dedicated circuit. We pull it and meet the inspector. It also matters for rebates and for your homeowner's insurance.
Charging at home is meaningfully cheaper per mile than public DC fast charging. If you are on a time-of-use rate, most chargers can be scheduled to run in the off-peak window, which we set up during commissioning.
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Learn moreNeed ev charger installation?
Tell us what you are working with. We will give you a fixed price and a date, at no charge.
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Get a quote for ev charger installation
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Call us(660) 342-5886
- Office
- 105 Hawks Haven Dr.O'Fallon, MO 63368By appointment — we come to you for estimates.
- Hours
- Monday – Friday7:00 AM – 6:00 PMSaturdayBy appointmentEmergency service24 / 7
- Emergencies
- Burning smell, sparking, a dead service or water near electrical equipment — call the main number any hour.
- Service area
- O'Fallon · St. Charles · St. Peters · Wentzville · Lake Saint Louis · Cottleville · Dardenne Prairie · Chesterfield
Get in touch
Call or email us
The fastest way to get an estimate is a phone call. Tell us what is going on and we will tell you what it needs, what it costs and when we can be there.
Helpful to include
- What is happening, and roughly when it started
- Home or business, and the town
- A photo of the panel or the problem
- When you are usually available
Monday – Friday: 7:00 AM – 6:00 PM. Emergency service available 24/7 — call the main number any hour.
Would rather just talk to someone? Call (660) 342-5886 — for anything urgent that is the fastest route.