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AfterFast, Reliable Solar Battery Storage & Backup Across Exeter
Solar battery storage in Exeter runs between $9,500 and $18,000 for a full installation, depending on whether you’re adding one battery or stacking two or three. Retrofit jobs on existing solar run lower, typically $7,000 to $12,000, because the inverter and panel work is already done. The real question for Exeter homeowners isn’t the hardware cost, it’s whether the battery is sized for what actually happens here: weeks of December tule fog that can cut solar production by 70% or more, right when you need backup most.
Gus’s Solar has been doing Solar Battery Storage & Backup work in Exeter long enough to know that a battery sized off a summer production chart will leave you dark in January. Call (877) 550-6892 and we’ll quote you real numbers off your actual usage, not a brochure.
Why Gus’s Solar Is Exeter’s Preferred Solar Battery Storage & Backup Company
Exeter is different from the foothill towns around it. You’re on the San Joaquin Valley floor, which means the tule fog that settles over Highway 65 in December and January doesn’t just slow your commute, it chokes your solar array for days at a time. A battery system spec’d without accounting for that fog season will undershoot your backup needs every single winter. We build that into every quote we write for Exeter, from homes near Exeter Union High School to ranches out Rocky Hill Drive that run irrigation pumps off the same meter as the house.
Gus Petrakis has put his own name on this company since 2011, and he’s the one who picks up when you call. That matters in a town like Exeter, where word travels fast and a company that disappears after the install doesn’t get a second chance. Our customers here know we answer the phone at (877) 550-6892, we show up when we say we will, and if something isn’t right, the 90-Day Done Right Promise means Gus comes back and fixes it. In writing.
We also know the housing stock. Most Exeter homes were built between the 1940s and early 1980s, and a lot of them still have original 100-amp panels. That’s not a dealbreaker for battery storage, but it changes the job. We flag the panel upgrade before we quote, not after we’re on your roof.
Our Solar Battery Storage & Backup Services in Exeter
Tesla Powerwall Installation
A single Tesla Powerwall 3 stores 13.5 kWh, which covers a modest Exeter ranch’s essential loads through one night. Two Powerwalls cover a larger home with AC cycling during summer triple-digit stretches off Highway 198. For Exeter specifically, we size for winter fog, not summer peaks. That’s the number that matters when the grid is up but your panels aren’t producing for three straight days.
Enphase IQ Battery Installation
If your existing Exeter solar array runs Enphase microinverters, the Enphase IQ Battery 5P is the simplest add-on. You keep your existing monitoring app, add 5 kWh modules as budget allows, and avoid a separate inverter swap. For homes east of downtown along Rocky Hill where panel space is tight, the wall-mounted IQ batteries tuck neatly into a garage sidewall.
Whole-Home Backup Power
Whole-home backup in Exeter usually means pairing two to three batteries with a smart electrical panel that sheds heavy loads automatically. That matters here because many Exeter properties run more than just the house. Citrus properties with cold storage, irrigation pumps, or a detached packing shed need a system that prioritizes what runs when the fog kills production and the grid dips. We design that on paper first, then on site. Bring me a bill, I’ll bring you the math. That’s how we quote every job in 93221.
Battery Retrofit for Existing Solar
This is the most common request we get in Exeter. You already have panels, maybe 5 to 8 kW on the roof of a 1960s ranch off E Pine Street, and you’re getting hit by NEM 3.0’s lower export rates. The fix is a battery retrofit that stores what you’d otherwise sell back for pennies and discharges it when you’re home using power. We’ve done dozens of these in Exeter, and the typical retrofit lands between $7,500 and $12,000 before incentives, depending on whether your existing inverter is battery-ready or needs a swap.
What happens when you call
- 1
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 Exeter
We install and service the batteries and inverters that hold up in the Valley’s heat and humidity swings. That includes Tesla and Enphase, plus FranklinWH for homeowners who want a modular system they can expand later, and Panasonic for long-cycle reliability. We keep common parts and firmware tools on the truck, which means fewer return trips when you’re out Rocky Hill way and the system throws a fault. Our crew trains on the equipment we install every year, and we don’t sub out the work. Gus’s name is on the truck and on the work.
Common Solar Battery Storage & Backup Problems We See in Exeter Homes
- Battery sized on summer production only. An installer plugs in your July kWh numbers, the system looks great for nine months, then December fog cuts production by 70% and your cold storage or irrigation pump has no backup when it matters. We size Exeter systems for the winter trough, not the summer peak.
- 100-amp panels with legacy wiring. Most pre-1980 Exeter homes still run original 100-amp service. Add a battery retrofit without upgrading the panel and you’ll get rapid shutdown faults and inverter errors. We include the panel upgrade in the quote before we start.
- Detached structures with separate service. Citrus-era properties often have a packing shed or detached garage with its own 60-amp panel and no solar tie-in. The battery gets installed, the shed stays unbacked, and the permit fails NEM 3.0 interconnection review. We catch this on the first site visit.
- NEM 3.0 sticker shock. Exeter solar owners who installed before April 2023 under NEM 2.0 got decent export rates. New installs and retrofits under NEM 3.0 get far less. A battery shifts the economics so you’re storing power instead of selling it cheap. Without that shift, the payback math doesn’t work.
Pricing for Solar Battery Storage & Backup in Exeter, CA
| Job Type | Typical Range |
|---|---|
| Single battery retrofit (existing solar) | $7,000 - $9,500 |
| New battery + inverter install | $9,500 - $13,000 |
| Two-battery whole-home backup | $15,000 - $18,500 |
| Panel upgrade (100-amp to 200-amp) | $2,800 - $4,500 |
| Detached structure tie-in (per structure) | $1,200 - $2,800 |
These are the numbers we’ve quoted on real Exeter jobs, not a national average. What moves the price: whether your inverter is battery-ready, whether you’ve got a 100-amp or 200-amp panel, and whether a detached shed or packing structure needs a separate interconnection. The price we quote is the price you pay. Take two weeks. Think about it. The price will be the same. Call (877) 550-6892 for a free estimate, and bring your utility bill so we can quote off real usage.
We Also Serve Cities Near Exeter
Beyond Solar Battery Storage & Backup in Exeter, Gus’s crew serves homes in Farmersville, Lindsay, Woodlake, and Visalia. Same crew, same 90-Day Done Right Promise, same live person answering the phone. When you call (877) 550-6892 from anywhere in Tulare County, you’re talking to Gus’s Solar directly.
Serving Exeter, CA - Our Local Coverage Area
We’re based in the Exeter 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 Exeter
Exeter’s December and January tule fog can cut solar production by 60 to 75% for days at a time, which means a battery sized for coastal irradiance will leave you short of backup right when you need it. We size Exeter systems to cover a 90% winter kWh offset for critical loads, not the summer peak number that a Santa Cruz installer would use, and we back that up with Solar Panel Maintenance & Monitoring - Exeter to keep performance on track. Call (877) 550-6892 and we’ll show you the winter-adjusted math on your own bill.
Yes, but it requires a secondary interconnection from your main panel to the shed and usually a service upgrade. One battery can cover both if the shed’s loads are modest, but if it runs cold storage or an irrigation pump, you may need a second battery or a load-shedding panel. We include the tie-in engineering in the quote before we touch anything.
Yes, and that’s the main reason Exeter homeowners are adding batteries to existing arrays. Under NEM 3.0, surplus power exported to the grid earns roughly 75% less than it did under NEM 2.0. A battery stores that surplus and discharges it when you’re home using power, so you consume what you produce instead of buying it back at retail. The payback in Exeter runs 6 to 9 years on most retrofits we quote.
First, check your panel amperage. Most pre-1980 homes east of downtown Exeter still run 100-amp service, and a battery retrofit usually requires 200-amp. Second, check your inverter model, because older string inverters from before 2017 may not be battery-compatible and will need a swap - something our Exeter Solar Panel Repair team handles regularly. Third, check whether any outbuilding has separate electrical service, because that changes the interconnection design. We’ll walk all of this when we come out for a free estimate.
No. Even a two-battery system stores 27 kWh at most, and a week of tule fog with your panels producing near zero will drain that in two to three days if you’re running AC, refrigeration, and pumps. The battery buys you time and shifts most of your self-consumption to evening hours, but it doesn’t replace the grid as a long-duration winter backup. What it does do is keep your essential loads running through the multi-day outages and brownouts that hit the Valley floor, while cutting what you’d otherwise pay at NEM 3.0’s poor export rates. Call (877) 550-6892 and we’ll model a realistic winter scenario on your actual usage, not a summer fantasy number.
Written by Gus Petrakis, Owner at Gus’s Solar, serving Exeter since 2011.
Ready to get a straight answer on battery storage for your Exeter home, or explore EV Charger Installation - Exeter while you’re upgrading? Call (877) 550-6892. A live person picks up. Estimates are free, and nobody will ask you to sign tonight.