Panel upgrade for EV charging in Chattanooga
A Level 2 charger is the biggest single load most Chattanooga homes ever add. If your panel is already near its limit, the charger is often the thing that forces the upgrade - and doing both together saves a second visit.
Signs your panel is too small for a charger
100-amp service
Many older Chattanooga homes still run on 100-amp service. With electric heat, a water heater, and a range, there is often not enough spare capacity for a 40 to 60-amp charger circuit.
No open breaker slots
A charger needs a double-pole breaker, which takes two adjacent slots. A full panel - or one already stuffed with tandem breakers - has nowhere to put it.
Lights dim when big loads start
Lights that dip when the air conditioner or dryer kicks on are a sign the service is already working near its limit. Adding a charger on top makes it worse, not better.
What a load calculation actually is
Before a charger goes in, the licensed contractor calculates what your home can draw at once. It is simpler than it sounds.
Every major appliance in your home has a rating in watts or amps - the air conditioner, water heater, range, dryer, and so on. A load calculation adds those up using the method in the National Electrical Code, which recognizes that you never run everything at full power at the same moment.
The result is a single number: how many amps your home legitimately needs. Compare that to your service size - 100, 150, or 200 amps - and the difference is what is left over for a charger. A 48-amp charger needs a 60-amp circuit, so you want at least that much headroom.
If the math comes up short, the options are a smaller charger setting, a load-management device that pauses charging when the house is working hard, or a service upgrade. The calculation tells you which one you actually need - it is the difference between guessing and knowing.
What a 200-amp upgrade involves
New panel, meter base, and service entrance
A licensed contractor removes the old panel and installs a new 200-amp panel, usually with a new meter base and the service-entrance cable or conductors between the meter and the panel. Existing circuits are landed on the new breakers and labeled.
One day of work, power off for part of it
Licensed contractors often finish an upgrade in a single day. The power is off for several hours while the swap happens, so plan for it - refrigerators stay closed, and the charger circuit is typically added in the same visit.
Permit and EPB coordination
A service upgrade is permitted electrical work with the City of Chattanooga, and it is inspected like any other permitted job.
The utility side runs in parallel: EPB has to disconnect and reconnect the service, and in some cases upgrade the drop or lateral feeding your home. That scheduling is coordinated as part of the job - the permit, the EPB appointment, and the inspection are typically sequenced by the contractor to minimize time without power.
Related pages
Not sure if your panel can take a charger?
Send a photo of your panel with the door open. We'll connect you with a participating licensed contractor who can run the load calculation and quote the appropriate options.