A lot of East Bay houses are still running electrical panels that no electrician will add to. If yours is one of them, that's the first conversation, not a footnote in a solar quote.
Much of Oakland, Berkeley, and Alameda was built or substantially rewired between the 1950s and 1970s. That's exactly the window when Federal Pacific Stab-Lok and Zinsco panels went into a great many homes. They were ordinary equipment at the time. They are not considered safe to add load to now.
The concern with both is the same in outline: breakers that may fail to trip reliably under fault conditions. A breaker that doesn't trip is a breaker that isn't protecting the circuit. Insurers have their own opinions about them, and some ask about the panel directly.
What this means for solar: a grid-tied system is an added source on your service. Reputable installers won't tie into one of these panels, and a permit inspector is unlikely to pass it. So the panel gets replaced first. Anyone quoting you solar on a Stab-Lok without mentioning it either hasn't looked or is planning to raise the price later.
Open the outer door of your main panel — the cover with the breaker handles visible, not the inner deadfront, which you should leave to an electrician — and look for a brand name:
Send me a photo of the panel with the door open. I can usually tell you what you're looking at from that, before anyone visits.
A main panel replacement is its own project: a separate permit, a coordinated disconnect and reconnect with PG&E, and a day or so without power. Where the meter and panel sit, whether the service entrance needs redoing, and whether anything has to move for clearance all drive the cost.
It also lengthens the schedule. A solar project that would have run 30 to 45 days can stretch considerably when a service upgrade is in front of it — see the timeline guide for where that time goes.
Often yes, and not only for solar. If you're staying in the house, a modern 200-amp service is the thing that makes everything else possible: the EV charger, the induction range, the heat pump water heater. Doing it once, properly, while the electricians are already coming is cheaper than doing it reactively in three years.
If you're selling soon, that calculus is different, and I'll say so.
Worth knowing before you agree to one: there are ways to add solar and even a charger to a constrained service without replacing it — a load-side tap sized correctly, a smart panel, or load management that keeps two big draws from running at once. These don't fit every house, and an unsafe panel still has to go regardless. But "you need a $6,000 upgrade" is sometimes the easy answer rather than the right one, and it's worth asking whether the alternatives were considered.
That question — what you actually need versus what's easiest to sell you — is most of what I'm for.
A free 45-minute visit, a look at your bill and your roof, and a straight answer about whether solar makes sense for your home.
Or call or text (510) 926-8332