Guides + blog
The math, in plain English
Guides and explainers from a Master Electrician. The full library (80+ posts) is on the live site for now - this is the short list worth reading first.
Most homes with 200-amp service have room to add a 40-amp EV charger without a panel upgrade. NEC 220.82 applies demand factors to your actual connected loads, and in most cases the resulting demand leaves capacity for the charger circuit. Whether your home is in that majority depends on what you already have running. That is what the NEC 220.82 load calculation tells you. I charge $12.99 to run it on your panel.
Why most EVs do not need a panel upgrade
The optional NEC 220.82 method gives credit for what your home actually uses, not the worst case.
Reading your panel like an electrician
Find the main breaker, count the slots, learn what brand and amperage actually mean.
The 80 percent rule, in plain English
Why a 50A circuit only carries 40A continuous, and why that matters for EV chargers.
Picking the right Level 2 charger for your panel
Why 40A is enough for most homes, and when 48A is worth reaching for.
The fastest way to learn is to run one
The assessment shows the math on your own panel in a few minutes.
Check my panel$12.99 - results in minutes