Going electric — heat pump HVAC, heat pump water heater, induction range, EV charger — is the big Bay Area home trend, and the first question is always the same: will my electrical panel handle it? Short answer: often yes, even on a 100A or 200A panel, but it depends on your calculated load — and where you're short, smart load management can add electric appliances without a full panel upgrade. Here's how to know before you buy the appliances.
Pacific Edge Electric and Solar is a licensed C-10 electrical contractor (CA #1143455) in Los Gatos. Electrification jobs — panel checks, new circuits, load management — are a growing share of our work across the South Bay, so this is the practical version.
Why electrification stresses your panel
Each electric appliance you add pulls meaningful current: a heat pump HVAC system, a heat pump water heater, an induction range, and a Level 2 EV charger are all substantial loads. Stack several onto an older 100A or even a 200A service and you can, in theory, exceed what the panel is rated to deliver. The key word is in theory — because your panel's real capacity depends on how much of that equipment ever runs at the same time, which is exactly what a load calculation figures out.
The tool that answers the question: a load calculation
An NEC Article 220 load calculation adds up your home's demand — existing loads plus the new electric equipment — using the code's diversity factors (it doesn't assume everything runs full-blast at once). The result tells you whether your existing service has headroom. We built a free NEC load calculator that does exactly this and produces a permit-ready PDF — the same document an inspector wants to see. It's the honest way to answer "will my panel handle it," instead of guessing from the panel's age.
Three outcomes — and what each costs
| Situation | Solution | Typical cost |
|---|---|---|
| Panel has headroom | Add dedicated circuits only | $300–$2,500 per circuit |
| Close, but short | Load management (EVEMS / smart panel) | $400–$3,000 |
| Genuinely out of capacity | Panel/service upgrade to 200A+ | $4,500–$14,000 |
Load management: the money-saver most people miss
Here's the part that saves homeowners thousands: you often don't need a bigger panel. Devices like an EVEMS (EV energy management system) or a smart panel automatically shed or throttle loads so two big appliances never overload the service at the same moment — for example, pausing EV charging while the heat pump and range are both running. That lets you add equipment within your existing service for a few hundred to a few thousand dollars, versus a full upgrade. It isn't right for every home, but it's always worth pricing first.
Plan the whole electrification path once
The homeowners who spend the least are the ones who plan ahead: if you know a heat pump, an EV, and solar-plus-battery are all coming over the next few years, we size the electrical once so you're not paying for repeated upgrades. Because we handle panels, EV charging, solar, and storage in-house, we can map the whole path on one visit. Start with the load calculator, see panel upgrades, or request a free assessment.
Frequently asked questions
Can a 100-amp panel handle a heat pump and an EV charger?
Sometimes — it depends on your other loads and how much runs simultaneously. A load calculation gives the real answer. Where a 100A service is short, load-management devices can often add the equipment without upgrading to 200A.
Do I need to upgrade my panel to electrify my home?
Not always. Many homes have headroom for new circuits, and smart load management can add appliances within an existing service. A full 200A+ upgrade ($4,500–$14,000) is only needed when a load calculation shows you're genuinely out of capacity.
How do I find out if my panel has enough capacity?
Run an NEC Article 220 load calculation, which accounts for your existing and planned loads using code diversity factors. Our free load calculator does this and generates a permit-ready PDF.
What is an EVEMS or smart panel?
A load-management device that automatically prevents two large loads from overloading your service at once — for instance, pausing EV charging when other big appliances run. It lets many homes add electric equipment without a full panel upgrade.
Costs are typical Bay Area planning ranges; your options depend on a load calculation and on-site assessment. Written by Adam Aksoy, licensed C-10 electrical contractor (CA #1143455), Pacific Edge Electric and Solar.