Understanding the Two Levels of Home EV Charging
Before evaluating readiness, it helps to know what you are sizing for. Level 1 charging uses a standard 120-volt outlet and typically adds only 3 to 5 miles of range per hour — slow enough that many EV owners find it inadequate for daily driving needs. Level 2 charging uses a 240-volt circuit, similar to what a dryer or electric range uses, and can add 20 to 30 miles of range per hour. Most EV charger installations are Level 2, and that is what this answer focuses on. Level 2 chargers typically require a dedicated 240-volt, 40- to 50-amp circuit (some faster chargers draw 60 amps), though your specific EV and charger model will determine the exact requirement.
Panel Capacity: The First Question to Answer
Your main electrical panel has a total service amperage rating — typically 100, 150, or 200 amps for residential service in the Denver area. Adding a 40- to 50-amp EV charging circuit is a meaningful addition to your home’s load. An electrician will perform a load calculation — comparing your panel’s rated capacity against the total draw of your existing circuits — to determine whether there is room for a charging circuit without exceeding safe limits. In homes with 200-amp service, there is usually room. In older Denver-area homes with 100-amp service, a panel upgrade may be needed before adding an EV charger. Some chargers also support load management features that can help reduce peak demand if panel capacity is tight.
Panel Slots and Physical Space
Even if your panel has adequate total amperage, it needs to have an available double-pole breaker slot for the new 240-volt circuit. If the panel is full, options include installing a tandem breaker (where the existing breakers allow), adding a small subpanel, or upgrading to a larger main panel. An electrician can tell you which approach is appropriate for your specific panel model.
- 200-amp panel with open slots: typically ready to add an EV circuit with minimal work
- 200-amp panel that is full: may need a small subpanel or tandem breakers
- 100-amp service: often requires a service upgrade first, especially if the home already has electric appliances
- Existing 240-volt outlet near the garage: may be usable directly or with a circuit upgrade, depending on amperage
Distance From Panel to Charging Location
The farther the charging location is from your main panel, the more wire is needed — and in some cases, a longer run at a given amperage requires a larger wire gauge to avoid voltage drop. A charger on the wall adjacent to the panel room is the simplest installation. A charger on the far side of a detached garage with no existing wiring path is more involved. In both cases it is achievable, but the complexity and cost vary. Your electrician can route the circuit through conduit in a way that meets code and protects the wire from Colorado’s outdoor conditions — temperature swings, UV, and the freeze-thaw cycles that stress outdoor installations.
Permitting in Colorado
EV charger installations require an electrical permit in Denver and surrounding jurisdictions. This triggers an inspection that verifies the circuit is correctly sized, protected, and grounded. Unpermitted charger installations can create problems with insurance and home sales and — more importantly — skip a safety check that protects your home. Done handles the permitting as part of the installation process, so you get a by-the-book installation without having to manage the paperwork yourself.
Ready to find out what your specific home needs? Done’s electricians can assess your panel, design the circuit, pull the permit, and complete the installation. Visit our EV charging page for more details, or explore our panels and wiring page if a panel upgrade might be part of the project. Browse all electrical services we offer as well.
Most homes can accommodate a Level 2 EV charging point, but whether yours is ready right now — without any electrical upgrades — depends on three things: how much capacity your main electrical panel has, whether your garage or charging location has the right wiring already in place, and how far the panel is from where you want to charge. A licensed electrician can assess all three in a single visit and tell you exactly what is needed.
Understanding the Two Levels of Home EV Charging
Before evaluating readiness, it helps to know what you are sizing for. Level 1 charging uses a standard 120-volt outlet and typically adds only 3 to 5 miles of range per hour — slow enough that many EV owners find it inadequate for daily driving needs. Level 2 charging uses a 240-volt circuit, similar to what a dryer or electric range uses, and can add 20 to 30 miles of range per hour. Most EV charger installations are Level 2, and that is what this answer focuses on. Level 2 chargers typically require a dedicated 240-volt, 40- to 50-amp circuit (some faster chargers draw 60 amps), though your specific EV and charger model will determine the exact requirement.
Panel Capacity: The First Question to Answer
Your main electrical panel has a total service amperage rating — typically 100, 150, or 200 amps for residential service in the Denver area. Adding a 40- to 50-amp EV charging circuit is a meaningful addition to your home’s load. An electrician will perform a load calculation — comparing your panel’s rated capacity against the total draw of your existing circuits — to determine whether there is room for a charging circuit without exceeding safe limits. In homes with 200-amp service, there is usually room. In older Denver-area homes with 100-amp service, a panel upgrade may be needed before adding an EV charger. Some chargers also support load management features that can help reduce peak demand if panel capacity is tight.
Panel Slots and Physical Space
Even if your panel has adequate total amperage, it needs to have an available double-pole breaker slot for the new 240-volt circuit. If the panel is full, options include installing a tandem breaker (where the existing breakers allow), adding a small subpanel, or upgrading to a larger main panel. An electrician can tell you which approach is appropriate for your specific panel model.
- 200-amp panel with open slots: typically ready to add an EV circuit with minimal work
- 200-amp panel that is full: may need a small subpanel or tandem breakers
- 100-amp service: often requires a service upgrade first, especially if the home already has electric appliances
- Existing 240-volt outlet near the garage: may be usable directly or with a circuit upgrade, depending on amperage
Distance From Panel to Charging Location
The farther the charging location is from your main panel, the more wire is needed — and in some cases, a longer run at a given amperage requires a larger wire gauge to avoid voltage drop. A charger on the wall adjacent to the panel room is the simplest installation. A charger on the far side of a detached garage with no existing wiring path is more involved. In both cases it is achievable, but the complexity and cost vary. Your electrician can route the circuit through conduit in a way that meets code and protects the wire from Colorado’s outdoor conditions — temperature swings, UV, and the freeze-thaw cycles that stress outdoor installations.
Permitting in Colorado
EV charger installations require an electrical permit in Denver and surrounding jurisdictions. This triggers an inspection that verifies the circuit is correctly sized, protected, and grounded. Unpermitted charger installations can create problems with insurance and home sales and — more importantly — skip a safety check that protects your home. Done handles the permitting as part of the installation process, so you get a by-the-book installation without having to manage the paperwork yourself.
Ready to find out what your specific home needs? Done’s electricians can assess your panel, design the circuit, pull the permit, and complete the installation. Visit our EV charging page for more details, or explore our panels and wiring page if a panel upgrade might be part of the project. Browse all electrical services we offer as well.
