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AfterFast, Reliable Solar Battery Storage & Backup Across San Francisco
Adding battery storage to a San Francisco home means keeping your lights on when the grid fails and slashing what you pay PG&E during the 4-9 pm peak. In most of San Francisco, a Tesla Powerwall 3 or Enphase IQ Battery installation runs $12,500-$17,500 before incentives, and a battery retrofit onto existing solar typically lands between $9,800 and $14,200 depending on panel work and permitting. We’re a locally owned shop with crews who know the fog zones, the Victorian roof lines, and the building inspectors by name. Call (877) 550-6892 for a straight quote off your actual bill.
Gus Petrakis put his name on this company in 2011. When you call, a live person answers. When something goes wrong, Gus’s crew comes back. That’s the whole deal. Whether you’re in the Mission District or out in Visitacion Valley, you’ll get the same honest math and the same 90-Day Done Right Promise in writing.
Why Gus’s Solar Is San Francisco’s Preferred Solar Battery Storage & Backup Company
We’ve been working on San Francisco roofs long enough to know that a house on a sunny Potrero Hill slope and a flat in the Outer Sunset need completely different battery sizing. The city’s hyperlocal fog microclimates create a city-within-a-city solar landscape: the Mission, Potrero Hill, and Noe Valley receive meaningfully more annual sun hours than neighborhoods just two miles west. Every proposal we write for San Francisco starts with a fog-zone assessment, not a generic city-average irradiance figure. That’s the difference between a battery that actually covers your evening load and one that leaves you pulling from the grid.
We’re not a pop-up sales crew. We have a published address in the San Francisco Bay Area, a license number anyone can verify, and an owner who answers his own phone. Gus’s background-checked, uniformed crew does every install, flashes every roof penetration properly, and doesn’t hand work off to subcontractors. If it’s not done right, the 90-Day Done Right Promise says Gus makes it right. One call brings him back.
San Francisco homeowners between the ages of 50 and 70 have told us the same story over and over: a national outfit quoted one number on the phone, then a different one at the door, then vanished. We quote the year-25 output, not the day-one brochure number. Bring us a bill, we’ll bring you the math. Take two weeks to think about it. The price will be the same.
Our Solar Battery Storage & Backup Services in San Francisco
Our Solar Battery Storage & Backup team handles everything from first quote to final inspection. Here’s what we do most often across San Francisco:
Tesla Powerwall Installation
A Tesla Powerwall 3 installation in San Francisco typically runs $13,000-$17,000 including gateway, permits, and labor. On a 1920s Edwardian rowhouse in Noe Valley, our crew retrofitted an existing 4.8 kW solar array with a Powerwall 3 after the owner’s 60-amp main panel maxed out. We coordinated the panel upgrade, ran the interconnection through SF’s building review, and set the battery to cover the 4-9 pm peak, preserving NEM 2.0 export credits while eliminating outage risk.
Fog matters. If your house sits in a June-gloom pocket, we size the Powerwall differently than we would for a Potrero Hill sun-trap. You don’t want a battery that cycles shallowly all summer and ages without ever delivering the backup runtime you paid for.
Enphase IQ Battery Installation
Enphase IQ Battery systems are a strong fit for San Francisco homes that already run Enphase microinverters. In San Francisco, a typical Enphase IQ 5P installation runs $11,500-$15,000. The modular design means you can start with one battery and add more later, which matters when you’re working around a 100-amp legacy panel and a tight budget. We handle the whole thing, grid interconnection included.
Whole-Home Backup Power
Whole-home backup in San Francisco means picking every circuit you actually need during an outage, not just a few lights. Most PG&E public safety power shutoffs here hit neighborhoods with overhead lines, and the fog doesn’t care how old your house is. We install battery systems sized to carry refrigeration, medical equipment, internet, and heat for the duration of a typical outage. Budget $14,000-$19,000 for a proper whole-home setup in San Francisco, depending on your panel and whether we’re adding a critical loads subpanel.
Battery Retrofit for Existing Solar
Plenty of San Francisco homes went solar years ago under NEM 2.0 and now want storage without losing their export credits. Retrofitting a battery onto existing solar in San Francisco typically runs $9,800-$14,200. We keep your original NEM agreement intact wherever possible, and we’re upfront when a main panel upgrade or historic district review will add cost or time. A retrofit is almost always cheaper than replacing your inverter, and we’ll tell you straight if your current hardware can stay.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Francisco
We install and service batteries from Tesla, Enphase, FranklinWH, and Panasonic, and we keep common parts stocked locally so a San Francisco service call doesn’t mean waiting a week on a warehouse three states away. If you have an existing Enphase system, we can usually add an Enphase battery without replacing your microinverters. If you’re leaning toward whole-home backup with generator integration, FranklinWH is worth a hard look. We’ll give you an honest read on which brand fits your roof, your panel, and your bill.
Common Solar Battery Storage & Backup Problems We See in San Francisco Homes
- Fog-zone shallow cycling: In the outer fog belt, batteries charge slowly through June, July, and August, then never hit full depth of discharge. That accelerates calendar aging and trims years off battery life. We size and program systems specifically for San Francisco fog, not Sacramento sun.
- Legacy 60-amp services tripping during grid charging: Pre-1930s rowhouses in the Mission and Noe Valley often still run original 60-amp mains. A battery that pulls full charging current can trip the main breaker at the worst possible time. We either upgrade the panel or set a lower charge rate, and we’ll tell you which makes sense before you spend a dollar.
- Historic-district placement failures: Street-facing parapets and Victorian ornamentation in ZIP codes like 94127 and 94103 often force surface-mount battery placement that violates fire code clearance. Fail the inspection, and you’re paying for a reinstall. We know the DBI reviewers and the fire code setbacks, so we spec the location right the first time.
- NEM 3.0 export losses from poorly configured batteries: Under NEM 3.0, exporting at noon earns almost nothing. If your battery is set to charge at 11 am and export at 2 pm, you’re giving power away. We program San Francisco systems around PG&E’s current time-of-use windows so your battery discharges when rates are highest.
Pricing for Solar Battery Storage & Backup in San Francisco, CA
Here’s what San Francisco homeowners should expect to pay, all-in with permits and labor:
| Service | Typical San Francisco Price Range |
|---|---|
| Tesla Powerwall 3 installation (new) | $13,000-$17,000 |
| Enphase IQ Battery 5P installation | $11,500-$15,000 |
| Battery retrofit onto existing solar | $9,800-$14,200 |
| Whole-home backup with critical loads subpanel | $14,000-$19,000 |
| Main panel upgrade (often required in pre-1930s homes) | $3,200-$5,500 |
What moves the number: whether your main panel can handle the battery’s charge rate, whether your house sits in a historic or conservation district where DBI requires additional planning review, and whether your roof can fit the battery with legal fire-code clearance. We quote off your actual PG&E bill and your actual roof, and the number we quote is the number you pay. No signature wanted tonight. Call (877) 550-6892 for a free estimate.
We Also Serve Cities Near San Francisco
Our Solar Battery Storage & Backup in San Francisco team covers the whole city, and we regularly work in the Mission District, Noe Valley, Chinatown, and Visitacion Valley. Same crew, same pricing, same live person on the phone.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Solar Battery Storage & Backup in San Francisco
Yes, but it will charge slower and shallower than it would inland. In San Francisco’s foggiest neighborhoods, June through August can produce 30-40% less solar than clear winter days. We size your battery and array specifically for your fog zone so you don’t end up with a battery that never reaches full charge in summer. Call (877) 550-6892 and we’ll model your house, not the city average.
Often, yes. Many pre-1930s San Francisco rowhouses still have original 60-amp services. A battery charging at full rate can pull more than the panel can safely deliver. A panel upgrade typically adds $3,200-$5,500 in San Francisco, but sometimes a lower charge rate setting gets you there without the upgrade. We’ll tell you the cheaper path.
If your home sits in a historic or conservation district, the Department of Building Inspection routes your battery permit through an additional planning review. That can add two to six weeks and may require low-profile or rear-yard mounting so the battery isn’t visible from the street. We coordinate that review and spec equipment that passes the first time.
Yes, as long as your existing inverter and microinverters are Enphase-compatible and in good working order. If your system is older or from a different brand, we can usually add the battery anyway with a system controller. We’ll inspect your current hardware and tell you what’s compatible before you buy anything.
Adding a battery doesn’t change your NEM agreement status, but under NEM 3.0 your export credits are worth far less during midday. A properly configured battery holds your excess solar and discharges it during the 4-9 pm peak, when PG&E rates are highest. That’s where the real savings come from. We set every San Francisco system up this way by default.
Written by Gus Petrakis, Owner at Gus’s Solar, serving San Francisco since 2011.