Choose a charging goal before choosing a charger. Have the circuit, panel capacity and utility needs assessed together.
Start with an ordinary driving day
Write down your usual daily miles, how long the vehicle stays parked, the vehicle’s charging limit and where its charging port will sit. These facts are more useful than simply asking for the fastest unit.
Level 1 uses 120-volt power and can suit modest daily driving with sufficient parked time. Residential Level 2 uses 240 volts and replenishes energy faster. Actual charging speed depends on the vehicle and installation. Outdoor equipment must be rated for the environment. U.S. Department of Energy: charging at home ↗
Capacity before hardware
Ask an electrician to assess existing demand, the proposed charging load and the route from the panel to the parking space. A charger is a sustained load; circuit design must account for that. Never select breaker or wire sizes from a generic online example.
Discuss a lower configured charging rate or a compatible, approved load-management system if capacity is constrained. Load management can limit charging as other household demand changes; suitability is a design decision, not a guarantee that an upgrade can be avoided.
Naperville permit and utility steps
The City’s EV guidance calls for a building permit and a residential load calculation for wiring upgrades, and recommends early utility contact. Customer-side and necessary utility improvements are the customer’s expense. Confirm the scope before ordering equipment. Naperville Electric Utility: EV charging ↗
Incentive: read the conditions before budgeting
The linked incentive guide describes a utility-bill credit up to $500, capped at 50% of eligible costs, with one award per household. It requires hardwiring, a City meter, final inspection and a complete application within six months. A Renewable Energy Program contribution of at least $5 monthly continues for five years after award. City EV incentive guide (linked January 2025 edition) ↗
The linked March 2025 terms also require OCPP support and exclude panel upgrades, surge suppressors, taxes and permit fees from eligible costs. Review all restrictions for equipment bundled with a vehicle, used units and installation costs. City EV incentive terms (March 13, 2025 revision) ↗
At the minimum contribution, five years totals $300. That is an arithmetic planning comparison, not a statement of net savings. The City’s broader funding notice lists exhausted programs without clearly establishing EV funding; confirm the EV program directly. City sustainability incentives & funding notices ↗
Hardwired or plug-in?
A hardwired unit has a permanent electrical connection. A plug-in unit uses an appropriately designed receptacle installation. Ask the electrician about equipment instructions, protection requirements, weather exposure and maintenance for either choice. A receptacle alone does not meet the published City incentive’s hardwiring condition.
Check connector compatibility, cable reach, warranty, offline behavior and optional subscription costs. Wi-Fi capability alone does not establish OCPP support. Ask the manufacturer and City to confirm the exact model if applying for an incentive.
Bring these details to an estimate
- Vehicle model, charging-port location and expected future second vehicle.
- Parking position, garage or exterior location, and preferred cable route.
- Panel assessment and load calculation, prepared by the electrician.
- Exact charger model, configured output and any load-management equipment.
- Separate prices for circuit work, trenching, restoration and service changes.
- Permit, inspection, utility coordination and incentive-document responsibility.