You usually do not need a panel upgrade for a Tesla charger if your home has 200-amp service with spare capacity — most modern Long Island homes are fine. You likely do need one if you're on 100-amp service, already run central AC, electric range, or a pool, or your panel has no open breaker spaces. The only way to know for certain is a load calculation: we add up your existing demand and the charger's continuous load, and if the total exceeds your service rating, an upgrade comes first. In Ronkonkoma, Smithtown, and Holbrook we see this split almost exactly down the line by the home's age.
Why it matters for Long Island homeowners
A Tesla Wall Connector can draw up to 48 amps continuously. Code requires the circuit to be sized at 125% of that — 60 amps — and that load sits on top of everything else your home already uses. Many postwar Long Island homes in Centereach, Selden, and Farmingville still run original 100-amp panels that were never designed for an EV plus a heat pump or central AC.
Installing a charger on a panel that can't support it leads to nuisance tripping, overheating, and a real safety hazard. Getting the load calculation right the first time protects your home and avoids paying twice.
How we decide
We perform an NEC load calculation on your existing panel, check available breaker spaces, and confirm the service entrance and meter can carry the new load. If your 200A panel has room, we install on the existing service. If you're on 100A or maxed out, we recommend a 200A upgrade — often a good time to add whole-home surge protection too.
Frequently Asked Questions
Do I need a 200-amp panel for a Tesla charger?
Not always. Many 200A homes already have capacity. Homes on 100A service, or 200A homes with heavy existing loads, often need an upgrade. A load calculation gives the definitive answer.
How much does a panel upgrade add to a Tesla charger install on Long Island?
A 200A panel upgrade on its own runs $3,000–$4,500; bundled with the charger install it runs $4,000–$6,000 total. Without an upgrade, a Wall Connector install runs $950–$1,800 with the panel nearby or $1,400–$2,800 for a long run (you supply the charger).
Can I install a Tesla charger on 100-amp service?
Sometimes, using a lower amperage setting or load management, but many 100A homes need an upgrade to do it safely. We confirm with a load calculation before recommending hardware.
Talk to a licensed Long Island electrician
Flexible financing available
Spread the cost of panel upgrades, EV chargers, and backup power over time. Ask about financing options when you request your estimate.
Ask about financing“Rob installed our EV charger and checked the panel first. Clean, professional, on time.”
“Electrician-led from start to finish. Panel upgrade done to code and permitted.”
“Planned our service upgrade with future solar in mind. Felt like a real long-term plan.”
Real Berman Electric Projects
Documented field reports from this kind of work on Long Island.