Can I Install a Level 2 Charger on a 100-Amp Panel?
From Solana Electrical, AZ ROC #341966
The short answer
Often, yes, but the panel size alone does not answer it. An electrician runs a load calculation to see how much capacity your home already uses. If there is room, a Level 2 charger can go on a 100-amp panel. If not, a lower charger setting, a load management device or a panel upgrade can work.
Why the answer depends on your home
A Level 2 charger needs its own 240-volt circuit, much like an electric dryer or range. It also draws power for long stretches, so the circuit is sized for continuous use. Whether a 100-amp panel can carry it depends on everything else in the house: the AC, electric range, water heater, dryer, pool or spa equipment, and any other large appliances.
In the Arizona heat, the air conditioner is usually the biggest load, and it runs hard in the same evening hours many people plug in their car. That is why two homes with the same 100-amp panel can get different answers. One with gas appliances and a smaller AC may have plenty of room. One with an electric range, electric water heater and a pool pump may not.
What an electrician checks
A load calculation, which adds up what your home can draw, using the method in the electrical code
Whether the panel has an open space for a two-pole breaker
The panel’s condition and brand, since some older panels are a concern on their own
The distance from the panel to where you park
Whether a permit is needed where you live
Your options if capacity is tight
Set the charger to a lower output. Most chargers allow this, and it still charges overnight for typical daily driving.
Add a load management device that slows or pauses charging when the house is drawing a lot.
Upgrade the panel or service when the home needs more capacity anyway, or when the panel is old or a brand with a poor record.
Consider Level 1 charging from a standard outlet if you drive only short distances each day.
Talk to a real person
Call (602) 999-2770 and a person answers, any hour. Tell us about your panel and your car, and we will talk through what makes sense. We will not sell you a panel upgrade you do not need, and you will hear the price before anyone drives out.
Common questions
Do I always need a panel upgrade for an EV charger?
No. Many homes have room. A load calculation shows whether yours does.
Can I use a regular outlet instead?
Level 1 charging uses a standard outlet and needs no new circuit, but it charges slowly. It works for some drivers who do not go far each day.
Does a charger installation need a permit?
Often, yes. Requirements depend on the city or county. We can tell you what applies to your address.
