Powerwall 3 vs Enphase 5P vs FranklinWH: which home battery is best in 2026?

The three most-requested batteries we install in Southern California right now differ most on continuous power output and usable capacity: Powerwall 3 tops out at 11.5 kW continuous, FranklinWH aPower 2 stores 13.6 kWh usable in one box, and a single Enphase 5P module holds 3.84 kWh (most homeowners stack two to four). All three fall in the $10,000–$16,000 installed range per unit, though that shifts depending on system size, electrical panel work, and your specific utility.

Last verified: July 2026 by Helios Energy Global.

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The comparison table: specs that actually matter

Spec	Tesla Powerwall 3	Enphase IQ Battery 5P	FranklinWH aPower 2
Usable capacity	13.5 kWh	3.84 kWh / module	13.6 kWh
Continuous power output	11.5 kW	3.84 kW / module	5.0 kW
Peak power output	22 kW (10 sec)	~7.68 kW (2 modules)	10.0 kW
Chemistry	LFP (lithium iron phosphate)	LFP	LFP
Inverter included?	Yes — hybrid solar + battery inverter	No — pairs with Enphase microinverters	Yes — hybrid inverter built in
Scalability	Up to 4 units stacked	Up to 4 modules per system	Up to 15.3 kWh expandable
Backup type	Whole-home capable	Partial-home or whole-home (stacked)	Partial-to-whole-home
Estimated installed cost (1 unit)	~$12,000–$16,000 (est.)	~$10,000–$13,000 / 2-module set (est.)	~$11,000–$15,000 (est.)
Warranty	10 years / unlimited cycles	15 years / unlimited cycles	12 years / unlimited cycles

All costs are estimates for Southern California as of mid-2026. Final price depends on panel work, trenching, utility interconnection, and system size. No federal tax credit applies to 2026 purchases — the 30% ITC expired December 31, 2025.

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Why the battery choice matters more under NEM 3.0

If you're on SCE, PG&E, or SDG&E, you're under NEM 3.0 (the CPUC Net Billing Tariff). Export rates during the day are now far below retail — often 5–8¢/kWh — while SCE's peak TOU rates run roughly 34–35¢/kWh from 4–9 PM. The math is simple: every kWh you store and use yourself instead of exporting is worth 4–5× more than selling it back. That makes self-consumption rate the single most important battery metric for SCE customers.

If you're on LADWP, the calculus is different. LADWP still offers retail-rate net metering, so you're not penalized for exporting — but at roughly 22¢/kWh average, the savings per kWh are lower to begin with. LADWP customers often find that one well-sized battery makes more sense than stacking multiple units. Pasadena PWP, Burbank, Glendale, Anaheim, and Riverside RPU customers: check your specific utility's net metering rules, as each runs its own program independent of CPUC.

Read our full NEM 3.0 explainer →

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Tesla Powerwall 3: the power-output leader

The Powerwall 3 is the most compelling option if your priority is keeping the whole house running during an outage — air conditioning, EV charger, well pump, whatever. At 11.5 kW continuous and a 22 kW peak, it can handle almost any residential load combination. It also ships with an integrated solar inverter, which means fewer boxes on the wall and a cleaner installation if you're doing solar and storage together.

Best for:

• SCE customers who want maximum self-consumption during the 4–9 PM peak window
• Homes with high-draw appliances (central AC, EV charging, electric dryer) that need real whole-home backup
• New solar + battery installs where the integrated inverter simplifies the job

Watch out for:

• It's a larger, heavier unit — garage or exterior wall space required
• Requires Tesla-certified installers; availability can be tighter in some zip codes
• One unit may not be enough storage for a large home on a multi-day outage; stacking two pushes cost to $24,000–$32,000+ estimated

Compare solar + battery system options →

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Enphase IQ Battery 5P: the monitoring and modularity champion

Enphase's approach is fundamentally different: modular 3.84 kWh bricks that bolt together, each with its own microinverter-level intelligence. Two modules (7.68 kWh) is the most common residential starting point; four modules (15.36 kWh) is the max per system today. If you already have Enphase microinverters on your roof, the 5P integrates natively with the Enlighten monitoring platform — panel-level production data plus battery state in one app.

Best for:

• Homes already on Enphase solar — the ecosystem integration is genuinely seamless
• Homeowners who want to start with two modules and add capacity later
• Customers who prioritize monitoring granularity and want to see exactly where every kWh goes
• LADWP customers with moderate storage needs who don't need massive backup power

Watch out for:

• Continuous power per module (3.84 kW) is modest — two modules at 7.68 kW continuous may not cover a central AC unit plus other loads simultaneously
• More physical units to mount means more wall space and potentially more labor cost
• 15-year warranty is the best of the three, which matters for long-term ROI calculations

See our battery options page →

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FranklinWH aPower 2: the capacity-per-dollar contender

FranklinWH is the least household-name of the three, but it's earned serious installer respect. The aPower 2 packs 13.6 kWh usable — essentially matching a Powerwall 3 on storage — in a single compact cabinet with a built-in hybrid inverter. At 5.0 kW continuous and 10 kW peak, it won't power a 5-ton central AC by itself, but it handles most typical Southern California home loads comfortably.

Best for:

• Homeowners who want maximum storage in one box at a competitive price point
• SCE customers focused on self-consumption: 13.6 kWh covers most evening loads without stacking units
• Retrofit installs where the existing solar inverter stays and you're adding storage only
• Buyers who want a strong warranty (12 years) without the Tesla brand premium

Watch out for:

• Less brand recognition means some homeowners have questions about long-term service support — ask your installer about their FranklinWH service experience
• 5.0 kW continuous is real-world capable but not whole-home for high-draw households
• Expansion options are more limited than Enphase's modular approach

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SGIP rebates: waitlisted, not gone

California's Self-Generation Incentive Program (SGIP) can meaningfully reduce battery costs — but as of mid-2026, residential SGIP budgets are waitlisted. You can still apply and get on the list; approvals do come through as funding cycles. We handle SGIP paperwork for every battery project we install. Don't let the waitlist stop you from moving forward — the interconnection and installation timeline often means the rebate arrives around the right time anyway.

Check our battery installation details →

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Which battery is right for your Southern California home?

Your situation	Best fit
SCE customer, want whole-home backup, new solar install	Powerwall 3
Already have Enphase solar, want to add storage gradually	Enphase IQ 5P
Want maximum storage per dollar, SCE self-consumption focus	FranklinWH aPower 2
LADWP customer, moderate loads, retail net metering still intact	Enphase 5P or FranklinWH
Large home, EV charger, central AC — need serious backup power	Powerwall 3 (consider 2 units)

The honest answer: all three are good batteries. The "best" one depends on your existing solar equipment, your utility, your panel capacity, your backup load list, and your budget. A custom load analysis — which we do for free — is the only way to get a real answer for your specific house.

Get a custom design and savings estimate →

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Frequently asked questions about home battery comparison

Does the 30% federal tax credit apply to a battery I buy in 2026?

No. The 30% federal residential solar and battery tax credit (the ITC) expired on December 31, 2025. There is no federal tax credit available for a home battery purchased in 2026. Check with your tax advisor about any state-level credits that may apply to your situation.

Can I add a Powerwall 3 to my existing Enphase solar system?

Generally, no — not in a clean integrated way. The Powerwall 3 includes its own hybrid inverter designed to work with string solar panels, not microinverters. If you have Enphase microinverters, the IQ Battery 5P is the natural pairing. FranklinWH can often be retrofitted to existing non-Enphase systems more flexibly; your installer should assess compatibility before you commit.

How many batteries does an SCE home actually need under NEM 3.0?

For a typical Southern California home using 25–35 kWh/day, one 13–14 kWh battery (Powerwall 3 or FranklinWH) covers most evening peak hours. Two units make sense if you have an EV charging overnight, a pool pump, or want multi-day outage resilience. An Enphase system with three or four modules can reach similar total capacity. See our solar vs. battery guide for NEM 3.0 →

Is FranklinWH a reliable brand for a long-term investment?

FranklinWH has been operating in the U.S. residential market since 2021 and has a growing installed base. The 12-year warranty is solid. As with any emerging brand, the key question is your installer's service relationship — ask how warranty claims are handled and whether they stock replacement parts. We install FranklinWH specifically because we're confident in the service chain.

Do any of these batteries qualify for SGIP in 2026?

All three are eligible battery technologies under SGIP guidelines. The issue is funding: residential SGIP budgets are waitlisted as of mid-2026. You can apply and join the waitlist — we file the paperwork as part of our installation process. Equity Resiliency tiers (for low-income or medical baseline customers) sometimes have separate budget availability; ask us about your eligibility.

Will my battery work during a grid outage if I'm on LADWP?

Yes, all three batteries offer automatic backup (islanding) capability — when the grid goes down, they disconnect from LADWP and power your home from stored energy and any solar production. LADWP's retail net metering program doesn't change backup behavior; that's a function of the battery hardware and inverter, not your tariff.

How long does installation take from contract to energization?

In Southern California, typical timelines run 6–12 weeks from signed contract to final utility permission to operate. That includes permitting (LA County and city building departments), utility interconnection application, and inspection scheduling. Enphase systems sometimes move faster because the modular design simplifies the permit set. We'll give you a project-specific timeline estimate at the design stage.

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Next steps

• Book a free consultation and custom design — we'll run a load analysis, check your utility tariff, and recommend the right battery for your specific home.
• Explore our battery installation services →
• See full solar + battery system options →
• Understand NEM 3.0 and how it affects your battery ROI →
• Compare solar vs. battery-first strategy under NEM 3.0 →
• Check solar panel and system costs for 2026 →
• Find your nearest Helios service area →