The capacity everything else depends on

Why it comes up so often

A house built before the 2000s was usually wired for a 100 amp service, which was plenty for a furnace, a range and a dryer. It isn’t plenty for a furnace, a range, a dryer, a heat pump, an EV charger and a solar array. Every one of those wants its own circuit, and the main bus has a limit on what it can carry. The panel is the first thing we look at on a site visit, because it decides what else is possible.

The solar connection

Solar feeds power back into the panel, and the electrical code limits how much the main bus can carry from both directions. As a rule of thumb a 100 amp panel takes about 50 amps of solar and a 200 amp panel about 80. That number caps how big a system can be permitted on the house. If you want enough solar to cover a bigger bill, the panel often has to grow first.

What the job involves

A new 200 amp panel and main breaker, laid out with room for what you’re adding. Often a new meter base and service entrance cable. A permit and an inspection. And a visit from the utility to disconnect and reconnect the service, which we schedule so you’re without power for a few hours on one day. If the panel lives in a finished basement we talk about the access now, not when the drywall is open.

Do it with the rest

If a panel upgrade is on the list, it belongs in the same quote and the same visit as the solar, the charger or the heat pump that needs it. One permit, one inspection, one utility appointment, and the new panel is built around the breakers it will carry. Splitting it into two jobs costs more and means two days without power instead of one.

Common questions about panel upgrades

How do I know if I need a panel upgrade?

Three signs. The label on the main breaker says 100 amps. The panel has no empty slots, or has tandem breakers squeezed in. Or you're adding something big: solar, a battery, a heat pump, an EV charger, a hot tub, an electric range. Any two of those on a 100 amp service usually means an upgrade. We check in five minutes on the site visit.

Why does solar need panel capacity?

Solar feeds power back into the panel, and the electrical code limits how much a panel's main bus can carry from both directions. As a rule of thumb a 100 amp panel takes about 50 amps of solar and a 200 amp panel about 80. A system bigger than the panel allows can't be permitted, so the panel sets the ceiling on how much solar the house can have.

What's involved in a 200 amp upgrade?

A new panel and main breaker, often a new meter base and service entrance, and the utility disconnecting and reconnecting the service for the day. It's a permit and an inspection like any electrical work. We coordinate the utility appointment so you're without power for hours, not days.

Can I upgrade the panel and add solar at the same time?

Yes, and it's cheaper that way. One permit, one inspection, one visit from the utility, and the new panel is laid out for the solar breaker from the start instead of being reworked later.

Is a full panel a fire risk?

A full panel isn't dangerous on its own; it just can't take more. What is a risk is a panel that's been worked around: tandem breakers where they don't belong, doubled-up wires on one breaker, or an old brand with a known failure history. If we see any of that we'll tell you.

See what usually needs the capacity: solar, batteries, heat pumps and EV chargers.