How much does a home battery cost in Knoxville?
By Our research team · Last verified · Methodology
Most home battery installs in Knoxville cost $10,500–$16,850 installed, for a single 13.5 kWh battery. The typical Knoxville job is $13,450, and the federal 30% credit does not apply to systems installed in 2026.
How we get this data- Typical
- $13,450
- Low end
- $8,200
- High end
- $20,950
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Get my fair quote →The typical Knoxville price is $13,450, 9% below the US typical of $14,750.
Knoxville's price band
Knoxville is cheaper than 87% of the 195 US metros we price for home battery work.
Expect $10,500–$16,850 for one 13.5 kWh battery, $910–$3,200 more for whole-home backup, and $1,350–$4,100 more if a 100-amp panel has to go to 200 amps.
EnergySage's first-half-2026 quotes in Tennessee averaged $720 per kWh before incentives, about $9,700 for a typical 13.5 kWh system. That was well under the national average of $1,159.
Prices are before incentives. The federal 30% battery credit is gone for 2026 installs (it ended for expenditures after December 31, 2025), so any help now comes from your utility or state. Check your utility for a battery or demand-response program before you sign.
Comparing cities, or after the US-wide picture? See the national guide: Home battery cost in the USA.
$10,500–$16,850 installed in Knoxville for one 13.5 kWh battery such as a Tesla Powerwall 3, typically $13,450. Whole-home backup on two batteries is $15,050–$31,000. Verified November 2026. Get free Knoxville quotes →
- One 13.5 kWh battery, installed: $10,500–$16,850 ($13,450 typical)
- Whole-home backup gateway: add $910–$3,200; two batteries: $15,050–$31,000
- Panel upgrade if needed: $1,350–$4,100; permit and utility fees: $140–$960
- No federal tax credit for batteries installed after December 31, 2025
- Tighter, older installs: Downtown & Old City; easier garage installs: West Knoxville, Farragut & Oak Ridge
Prices verified November 2026 · Cross-referenced against 57+ American pricing sources · See methodology
Installed prices before any utility or state incentive. Knoxville metro, re-verified November 2026. Comparison lines (generators, power stations) are shown so you can weigh the options.
| Service | Low | Typical | High |
|---|---|---|---|
| Tesla Powerwall 3 (13.5 kWh), installedinstalled | $10,500installed | $13,450 | $16,850 |
| Powerwall 3 Expansion unit (13.5 kWh), added at installinstalled | $4,700installed | $6,100 | $7,500 |
| Second battery added at install (Powerwall 3 or aPower 2)installed | $8,350installed | $9,300 | $11,600 |
| Enphase IQ Battery 5P (5 kWh), per unitinstalled | $5,500installed | $6,450 | $8,300 |
| Enphase IQ Battery 10C (10 kWh)installed | $10,150installed | $12,450 | $15,650 |
| FranklinWH aPower 2 (15 kWh) with aGateinstalled | $13,350installed | $16,550 | $21,200 |
| SolarEdge Home Battery (9.7 kWh)installed | $11,050installed | $14,100 | $18,400 |
| Other ~10 kWh battery (EG4, EcoFlow, Fox ESS, Canadian Solar)installed | $6,000installed | $10,150 | $15,200 |
| Two batteries for whole-home backup (27–30 kWh)installed | $15,050installed | $20,950 | $31,000 |
| Battery added to existing solar (AC-coupled)installed | $10,950installed | $13,900 | $17,800 |
| Battery without solar (charges from the grid)installed | $10,500installed | $13,450 | $16,850 |
| Whole-home backup gateway or transfer switchinstalled | $910installed | $1,650 | $3,200 |
| Critical-loads subpanel (partial backup)installed | $360installed | $910 | $1,600 |
| Main panel upgrade for a battery (100A to 200A)installed | $1,350installed | $2,300 | $4,100 |
| Permit and utility interconnection feesper job | $140per job | $430 | $960 |
| Battery service visit (monitoring, firmware, re-commissioning)per visit | $140per visit | $320 | $730 |
| Out-of-warranty battery replacement (remove old, install new)installed | $9,550installed | $12,550 | $15,950 |
| Standby generator, 20–24 kW (for comparison)installed | $7,900installed | $10,700 | $14,850 |
| Portable power station + home transfer panel, about 4 kWh (for comparison)installed | $3,850installed | $5,300 | $7,250 |
| Portable generator hookup: interlock kit and inletinstalled | $360installed | $570 | $780 |
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Prices verified November 2026 · Cross-referenced against 57+ American pricing sources · See methodology
Prices cover the Knoxville metro and assume one 13.5 kWh battery mounted on a garage or outside wall. Older homes in East Knoxville & Mechanicsville more often need panel work.
Home battery prices across Knoxville
Same battery, four price bands. The spread comes from panels, wall space and access: tighter and older in Downtown & Old City, easier in West Knoxville, Farragut & Oak Ridge.
Downtown & Old City
- Installed
- $11,350–$17,850 installed
- Typical job
- $12,300–$21,250 / one battery + whole-home backup
The priciest part of the metro to install in: older wiring, small panels and awkward access push labor up, even though the battery itself costs the same.
East Knoxville & Mechanicsville
- Installed
- $10,900–$17,200 installed
- Typical job
- $11,850–$20,450 / one battery + whole-home backup
Character homes and older wiring. The battery price is standard; the add-ons (panel, subpanel, longer wire runs) decide the final number.
Fort Sanders & UT
- Installed
- $10,300–$16,000 installed
- Typical job
- $11,200–$19,050 / one battery + whole-home backup
Lots of rentals, so fewer battery jobs. Owners pay standard metro prices, and smaller homes often need only partial backup.
West Knoxville, Farragut & Oak Ridge
- Installed
- $10,500–$16,850 installed
- Typical job
- $11,400–$20,050 / one battery + whole-home backup
Newer homes, attached garages and room for two batteries. The battery price is standard; the second unit is where the bill grows.
Real home battery jobs in Knoxville
Here's what common home battery jobs cost in Knoxville in 2026, installed, before incentives.
Essentials backup: one battery + critical-loads panel
Fridge, furnace fan, lights, Wi-Fi and a few outlets on one 13.5 kWh battery. The battery is $10,500–$16,850 installed; moving those circuits to a critical-loads subpanel adds $360–$1,600.
Whole-home backup: one battery + gateway
A whole-home gateway or transfer switch ($910–$3,200) lets one battery run the whole panel during an outage. Central AC or a well pump may still need a second battery to start reliably.
Bigger home: two batteries
27–30 kWh for larger homes or longer outages. A Powerwall 3 plus an expansion unit sits at the low end; two full units or two FranklinWH aPower 2s sit at the top.
Adding a battery to solar you already have
An AC-coupled battery works next to your existing inverter. Expect $10,950–$13,900 for a straightforward job; older inverters or a full panel push it toward $17,800.
Older home: battery + panel upgrade
Many 100-amp panels have no room for a battery. Going to 200 amps adds $1,350–$4,100 in Knoxville, and doing it with the battery means one permit and one inspection.
How much does a home battery cost in Knoxville?
Between $10,500 and $16,850 for one 13.5 kWh battery, installed, and most Knoxville homeowners pay close to $13,450. Three things set the number: how much of the house you back up, whether the panel needs work, and the brand. Partial backup on a good 200-amp panel lands near the low end; whole-home backup with a gateway and a panel upgrade can pass $18,500.
Adding storage at install time is the cheap way to get more of it. A Powerwall 3 expansion unit adds 13.5 kWh for $4,700–$7,500 in Knoxville, against $8,350–$11,600 for a second full Powerwall 3. Two batteries for whole-home backup run $15,050–$31,000, re-verified against 57 sources in November 2026.
Home battery prices in Knoxville (2026): the lines on a quote
One battery is $10,500–$16,850 installed, whole-home backup adds $910–$3,200, and a panel upgrade adds $1,350–$4,100.
| Line on the quote | Low | Typical | High |
|---|---|---|---|
| Tesla Powerwall 3 (13.5 kWh), installed | $10,500 | $13,450 | $16,850 |
| Expansion unit, added at install | $4,700 | $6,100 | $7,500 |
| Whole-home backup gateway | $910 | $1,650 | $3,200 |
| Critical-loads subpanel | $360 | $910 | $1,600 |
| Main panel upgrade (100A to 200A) | $1,350 | $2,300 | $4,100 |
| Permit and utility fees | $140 | $430 | $960 |
| Battery service visit | $140 | $320 | $730 |
| Standby generator, 20–24 kW (comparison) | $7,900 | $10,700 | $14,850 |
Partial vs whole-home backup in Knoxville: the gap is the gateway ($910–$3,200) and, often, a second battery. If you only need the fridge, furnace and Wi-Fi through an outage, partial backup on one battery is the better buy.
What moves a home battery quote in Knoxville:
- Backup level — partial backup on a backup switch is cheapest; whole-home backup adds a gateway and often a second battery.
- The panel — a full or 100-amp panel can add $1,350–$4,100 for an upgrade.
- Where it mounts — a garage or outside wall near the panel is cheapest; long wire runs and trenching add labor.
- Brand and size — a 5 kWh Enphase unit and a 15 kWh FranklinWH are very different checks.
- Permits and the utility — $140–$960 in fees, plus the wait for permission to operate.
Ask every Knoxville installer for the same four things: the battery price, the backup equipment (switch, gateway or subpanel), the panel work, and permit and utility fees. Compare those lines, not the total. Get a quote for your battery install →
Home Battery Cost in Knoxville by Backup Level
Essentials backup on one battery is $10,500–$16,850, whole-home backup with a gateway is $11,400–$20,050, and two batteries for a larger home are $15,050–$31,000, before any utility incentive.
Worked example: a Knoxville home with a 200-amp panel and a garage wall next to it gets one Powerwall 3 at $13,450 plus a whole-home gateway at $1,650: $15,100. The same house with a 100-amp panel adds an upgrade at $2,300, for $17,400.
A larger home that wants central AC on backup usually needs two batteries ($20,950 typical) plus the gateway, about $22,600. For comparison, a 20–24 kW standby generator runs $7,900–$14,850 installed in Knoxville, plus fuel.
Knoxville Home Battery Costs by Battery
| Battery | Cost | Best for |
|---|---|---|
| Tesla Powerwall 3 — 13.5 kWh | $10,500–$16,850 installed | One box for whole-home backup · 10 yrs, 70% capacity |
| Powerwall 3 Expansion — adds 13.5 kWh | $4,700–$7,500 installed | More hours of backup on the same inverter |
| Enphase IQ Battery 5P — 5 kWh each | $5,500–$8,300 installed | Stacking small units on Enphase solar · 15-yr warranty |
| Enphase IQ Battery 10C — 10 kWh | $10,150–$15,650 installed | Enphase homes wanting one larger unit · 15 yrs, 60% capacity |
| FranklinWH aPower 2 — 15 kWh | $13,350–$21,200 installed | Big loads and long outages · 15 yrs, 70% capacity |
| SolarEdge Home Battery — 9.7 kWh | $11,050–$18,400 installed | Homes with SolarEdge inverters · 10 yrs, 70% capacity |
| Other ~10 kWh batteries | $6,000–$15,200 installed | Lower upfront price; check local installer support |
| Two batteries — 27–30 kWh | $15,050–$31,000 installed | Larger homes, central AC, well pumps |
| Standby generator, 20–24 kW (comparison) | $7,900–$14,850 installed | Outages that last days, homes with natural gas |
Battery vs installation: where a Knoxville quote goes
The battery itself is about $8,200–$10,000 for a Powerwall 3 anywhere in the US. On a $13,450 Knoxville job that leaves roughly $4,350 for labor, wiring, the backup switch or gateway, permits and the utility paperwork.
That is why Knoxville bids for the same battery can sit $6,350 apart. One installer's $13,450 may include a whole-home gateway and permit fees; another's $12,350 may not. Line up the items before you compare totals.
What's included in a Knoxville battery quote (and what costs extra)
A standard quote covers the battery, mounting, wiring to your panel, a basic backup switch, commissioning and the app setup. The headline price often leaves out:
- Whole-home backup gateway — $910–$3,200 if you want the whole panel backed up
- Panel upgrade — $1,350–$4,100 to go from 100 to 200 amps
- Critical-loads subpanel — $360–$1,600 for partial backup on older panels
- Permit and utility fees — $140–$960, plus bollards or a heat alarm if the battery goes in a garage
Ask for the warranty terms in writing: years, capacity guaranteed at the end, and who services the battery locally.
Your local market
Knoxville is a mid-size market for home batteries. The hardware price is national; labor, permits and how many installers compete for the job are local, and they decide whether a quote lands nearer $10,500 or $16,850.
How much of the house you back up
Partial backup on one battery is $10,500–$16,850. Whole-home backup adds a gateway ($910–$3,200) and, in bigger homes, a second battery.
Your electrical panel
A crowded or 100-amp panel is the most common surprise. Upgrading to 200 amps adds $1,350–$4,100 in Knoxville; a critical-loads subpanel adds $360–$1,600.
Where the battery goes
Garages and outside walls are the usual spots. Model codes keep batteries out of bedrooms and living space, cap garage installs at 80 kWh, and call for impact protection where a car could hit the unit.
Brand and capacity
An Enphase IQ 5P is $5,500–$8,300 per 5 kWh unit, a Powerwall 3 $10,500–$16,850 for 13.5 kWh, and a FranklinWH aPower 2 $13,350–$21,200 for 15 kWh.
Solar or no solar
A battery added to existing solar is $10,950–$17,800; a grid-charged battery with no solar is $10,500–$16,850. A battery installed with new solar shares one permit and one crew.
Permits and the utility in Knoxville
Expect $140–$960 in permit and interconnection fees and a wait for the utility's permission to operate if the battery ties into solar.
- Get two or three bids.Same battery, different labor lines. Knoxville quotes for one 13.5 kWh battery run $10,500–$16,850; a second bid is the fastest way to find the padding.
- Back up the essentials, not the whole house.A critical-loads subpanel ($360–$1,600) keeps one battery on the circuits that matter. A second battery costs $8,350–$11,600.
- Ask about your utility's battery program.Programs that pay you to share the battery at peak times can return a few hundred dollars a year or more.
- Add storage at install time.An expansion unit added with the first battery is $4,700–$7,500. Coming back later means a second trip, a second permit and often a second full battery.
- Do the panel work with the battery.A 200-amp upgrade ($1,350–$4,100) done in the same job shares the permit, the inspection and the utility visit.
- Read the warranty before you pick a brand.Powerwall 3 and SolarEdge carry 10 years at 70% capacity; Enphase and FranklinWH carry 15 years. A longer warranty can be worth a higher price.
Before you pay a deposit to a Knoxville installer, get these in writing:
- The battery brand, model and usable kWh
- Backup type: partial (backup switch or subpanel) or whole-home (gateway)
- Any panel upgrade or subpanel, priced as its own line
- Where the battery mounts, and any bollards or heat alarm the code needs
- Permit, inspection and utility interconnection fees
- Warranty: years, capacity guaranteed and who services it locally
- Monitoring app setup and any utility program enrollment
- Payment schedule, and what happens if the utility approval is delayed
How much does a home battery cost in Knoxville?
$10,500–$16,850 installed for one 13.5 kWh battery, and $13,450 is typical. Whole-home backup adds $910–$3,200 for a gateway, and two batteries run $15,050–$31,000.
How much is a Tesla Powerwall 3 in Knoxville?
About $13,450 installed, within a $10,500–$16,850 range. An expansion unit adds 13.5 kWh for $4,700–$7,500 when it goes in with the first battery.
What does whole-home battery backup cost in Knoxville?
$11,400–$20,050 for one battery with a whole-home gateway, or $15,050–$31,000 for two batteries in a larger home or one with central AC.
Is there still a federal tax credit for home batteries in Knoxville?
No. The 30% Residential Clean Energy Credit ended for expenditures made after December 31, 2025, and the IRS treats the expense as made when installation is complete. Ask your utility about battery or demand-response programs instead.
How much does it cost to add a battery to existing solar in Knoxville?
$10,950–$17,800 for an AC-coupled battery next to your existing inverter. A battery without any solar, charging from the grid, is $10,500–$16,850.
Do I need a panel upgrade for a battery in Knoxville?
Not always. Many 200-amp panels take a battery as they are. A full or 100-amp panel may need an upgrade ($1,350–$4,100) or a critical-loads subpanel ($360–$1,600).
Home battery or standby generator in Knoxville?
A 20–24 kW standby generator is $7,900–$14,850 installed and runs as long as the fuel lasts. A battery is $10,500–$16,850, is silent, needs no fuel and can cut bills on time-of-use rates, but covers hours to a day or so per 13.5 kWh unless solar recharges it.
How much do Enphase and FranklinWH batteries cost in Knoxville?
Enphase IQ Battery 5P: $5,500–$8,300 per 5 kWh unit; IQ Battery 10C: $10,150–$15,650. FranklinWH aPower 2 (15 kWh): $13,350–$21,200, installed.
What permits does a home battery need in Knoxville?
An electrical permit at minimum, often a building or fire review, and your utility's approval if the battery ties into solar or can send power to the grid. Fees run $140–$960. Garage installs may need a heat alarm and bollards.
How long does a home battery last, and what does upkeep cost?
Warranties run 10 years (Powerwall 3, SolarEdge) to 15 years (Enphase, FranklinWH), guaranteeing 60–70% capacity at the end. Upkeep is mostly app monitoring; a service visit costs $140–$730 once the warranty is over.
Prices verified November 2026 · Cross-referenced against 57+ American pricing sources · See methodology
Prices for the Knoxville metro area, November 2026. Outer suburbs may vary.
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