01
Why a charger can max out your panel
A Level 2 charger draws a lot of continuous current — typically a 40 to 60 amp circuit. Your panel has a fixed total capacity (often 100 or 200 amps), and the electrical code requires that all your loads, including the new charger, fit within it.
In older Del Mar, Encinitas, and Leucadia homes with 100-amp panels already running AC, an electric range, and a dryer, there may simply not be headroom for a charger. That is when an upgrade — or a smarter workaround — comes in.
02
Signs you might need an upgrade
- Your panel is labeled 100 amps (check the main breaker number).
- There are no open breaker slots — the panel is full.
- You already have central AC, an electric range, an electric dryer, and a pool/spa.
- Breakers trip when several large appliances run at once.
- The panel is a known problem brand (e.g., Federal Pacific, Zinsco) — these should be replaced regardless.
03
When you can skip the upgrade
A panel upgrade is not always the answer. If you have 200-amp service with open slots, you are likely fine. And even on a tight 100-amp panel, a load-management device (an "EV energy management system") can let the charger automatically dial back when other big loads are running — often satisfying code without a full upgrade.
A good electrician explores these options before quoting you a panel upgrade you may not need.
A proper load calculation — not a guess — is what determines this. We do it as part of your free EV charger quote.
Official sources
Common questions
Before you decide.
How do I know if I have 100-amp or 200-amp service?+
Open your panel door and read the number on the main breaker at the top — it will say 100, 125, 150, or 200. If you are unsure, send us a photo and we will tell you.
Can I add a charger to a full panel?+
Sometimes — with a load-management device that throttles the charger when other loads spike. If that is not feasible, a panel upgrade is the safe path. We assess both.
How much does a panel upgrade add?+
Typically $2,000–$4,000 in San Diego, depending on the service size and whether SDG&E coordination is required. See our panel upgrade cost guide for details.