Tesla Powerwall 3 vs. Enphase IQ Battery 5P vs. FranklinWH aPower 2

Three different architectures, not three flavors of the same thing

Tesla Powerwall 3 is fundamentally a DC-coupled all-in-one unit: it has an integrated hybrid inverter with six MPPTs and up to 20 kW of DC solar input built into the same box as the battery. That's the standard configuration for a new solar-plus-storage install. But Powerwall 3 can also run AC-coupled to an existing separate solar inverter through Tesla's Backup Gateway 2, which supports up to 10 AC-coupled Powerwalls — in that mode the Powerwall becomes its own site controller and the Gateway's controller function switches off. It is genuinely both, depending on how the installer configures it, and any comparison that flattens it to just "DC-coupled" or just "AC-coupled" is oversimplifying.

Enphase IQ Battery 5P is 100% AC-coupled by design, with no DC input and no MPPTs on the unit itself. What makes it structurally different from the other two is that it isn't a single battery with one inverter — it's six embedded IQ8D-BAT grid-forming microinverters working in parallel inside one enclosure. There's no single point of failure the way a Powerwall's or aPower's central inverter represents. It also retrofits cleanly onto an existing Enphase microinverter solar array, which the other two can't do without an AC-coupling adapter.

FranklinWH aPower 2 is AC-coupled and inverter-agnostic — it pairs with any existing solar inverter, which makes it the most flexible retrofit option of the three for a house that already has panels from any manufacturer. It requires FranklinWH's aGate controller to function as a full energy-management system across solar, grid, generator, and EV — that's a mandatory add-on, not an option, and it adds real cost.

FranklinWH aPower 2 vs. Tesla Powerwall 3, head to head

Most people who search 'Franklin Powerwall' are choosing between these two, so here they are side by side, using only each manufacturer's own datasheet.

Storage per unit: the aPower 2 lists 15 kWh usable; the Powerwall 3 lists 13.5 kWh. Continuous output: FranklinWH lists 10 kW; Tesla lets the installer set 5.8, 7.6, 10 or 11.5 kW on-grid, and up to 15.4 kW off-grid at the 11.5 kW setting with an 80 A breaker. Short bursts: FranklinWH lists 15 kW for 10 seconds and 25 kW for 1 second; Tesla lists a 185 LRA motor-start rating. Charging: the aPower 2 lists 8 kW of charge power.

Efficiency is stated differently. FranklinWH lists 90 percent round trip, grid to battery to load. Tesla lists 89 percent for solar to battery to home or grid, and 97.5 percent for solar straight to the home or grid through its built-in inverter.

Warranty: FranklinWH lists 15 years or 60 MWh of throughput. Tesla's US limited warranty (revision 2.6, effective May 6, 2026) covers 10 years with 70 percent energy retention at 10 years, unlimited cycles for self-consumption, time-based control and backup, and 37.8 MWh for other uses. Tesla adds that if the Powerwall lacks an internet connection for an extended period or isn't registered, it may not honor the full ten years, but will honor at least four.

Scaling and size: up to 15 aPower 2 units per aGate for 225 kWh on 120/240 V service, against 4 Powerwall 3 units plus 3 Expansion units for 94.5 kWh. The aPower 2 weighs 357 lb; the Powerwall 3 weighs 291.2 lb installed. Both list an operating range of -4°F to 122°F.

The practical split: on a new install, the Powerwall 3's built-in solar inverter (up to 20 kW DC, six MPPTs) saves a component. On a house with existing solar from any brand, the aPower 2 couples through the aGate, while the Powerwall 3 is limited by Tesla to 7.68 kW AC of existing solar per Powerwall on the backup side, or 10 kW with Expansion units.

Capacity, output, and what that means at the breaker panel

Powerwall 3's output is field-selectable at install: 5.8 kW, 7.6 kW, 10 kW, or 11.5 kW continuous AC, with max apparent power to 11,500 VA at the top setting. Off-grid, PV-only discharge can reach 15.4 kW, but only if the on-grid setting is locked to 11.5 kW and the installer runs an 80A breaker with sized conductors — a detail that matters for panel-capacity planning and should be discussed with your installer before assuming you'll get that number. Load-start capability is 185 LRA, enough to start most single AC compressors without a soft-starter.

Enphase's 5P delivers 3.84 kVA continuous at 240V (3.33 kVA at 208V), with a 3-second peak to roughly 7.68 kVA and 48A LRA start capability. Because each unit is only 5.0 kWh, whole-home backup on a typical California house means stacking three or four units — which raises labor and wiring cost per kWh delivered compared to a single larger box, even though the hardware itself scales cleanly.

FranklinWH's aPower 2 delivers 10 kW continuous and 15 kW peak for 10 seconds, with 8 kW continuous charge power — the highest continuous output per single unit of the three. For a house with a well pump, HVAC compressor, and other simultaneous heavy loads during an outage, that per-unit headroom is a real advantage over needing multiple smaller units to hit the same instantaneous draw.

Scalability: how big can each system actually get

Tesla caps a single system at 4 Powerwall 3 units (each with its own inverter) plus up to 3 Expansion units (battery-only, no inverter, floor-mount only, not field-serviceable individually, and compatible only with Powerwall 3 — not with older Powerwall 2 or Powerwall+). That's 7 total units, 94.5 kWh, and per Tesla's own marketing copy, up to 44 kW combined output at the top end.

Enphase's ceiling depends on the controller: up to 4 IQ Battery 5P units (20 kWh) on an IQ System Controller 3G without a power control system, or up to 8 units (40 kWh) on an IQ System Controller 3 with PCS enabled. Some secondary sources claim a 16-unit, 80 kWh ceiling — that contradicts Enphase's own support-page FAQ and shouldn't be relied on; treat 40 kWh as the real ceiling until Enphase publishes otherwise.

FranklinWH scales the furthest on paper: up to 15 aPower 2 units per aGate controller, 225 kWh total — but only on standard 120/240V split-phase residential service. On 208V service (relevant for some California multi-family and ADU-adjacent properties), the datasheet caps it at 2 units per aGate. If your property runs 208V, confirm this with your installer before assuming the 225 kWh figure applies.

Warranty terms: read past the headline year count

Tesla's Powerwall 3 warranty is 10 years, with 70% energy retention guaranteed at 10 years and unlimited cycles for solar self-consumption, time-based control, and backup use, per Tesla's US limited warranty (revision 2.6, effective May 6, 2026). Other uses are capped at 37.8 MWh of aggregate throughput. The same document says Tesla needs an internet connection to deliver firmware updates for the full ten-year term: if the Powerwall is offline for an extended period or isn't registered, Tesla says it may not honor the full ten years, but commits to at least four. Keep the unit online and registered, and confirm registration before your installer leaves. The warranty also transfers to a later owner who can show proof of ownership.

Enphase's IQ Battery 5P carries a 15-year warranty (or 6,000 cycles, whichever comes first) with over 60% capacity retention guaranteed. At roughly one cycle per day, 6,000 cycles works out to about 16.4 years — so the cycle cap and the term roughly align for a typical daily-cycling household, but a heavy user pulling multiple cycles a day could hit the cycle ceiling before the 15-year clock runs out.

FranklinWH's aPower 2 carries a 15-year warranty tied to a 60 MWh aggregate throughput cap, matching Enphase's term length and beating Tesla's 10-year headline number. What FranklinWH does not publish, as of September 23, 2026, is a stated capacity-retention percentage at the end of that term — Tesla commits to 70% at 10 years, Enphase to over 60% at 15 years, and FranklinWH has not published a comparable number in its datasheet or in any verified secondary source. That's a real gap in what the company discloses, not a knock on the hardware — but don't let anyone tell you FranklinWH matches the other two on this point until they publish a number.

App, monitoring, and the installer-bankruptcy problem nobody puts in the brochure

Enphase's datasheet is the only one of the three that explicitly calls out open API integration alongside its Installer Platform and consumer app — relevant if you want a system that talks to third-party home-energy software. Tesla and FranklinWH each offer only their own proprietary mobile app, with no API integration claim in either datasheet.

Here's the part that matters more than any app screenshot: California has already lost a major installer this year. Freedom Forever filed Chapter 11 on April 15, 2026 in the U.S. Bankruptcy Court for the District of Delaware. After a proposed sale to company insiders fell through, it asked the court on July 31, 2026 to convert the case to Chapter 7 liquidation, and the judge signed that order on August 7, 2026 — the company no longer operates. If Freedom Forever installed your battery, the safe assumption is that you need to check your paperwork regardless. The manufacturer's warranty on the hardware itself — Tesla, Enphase, or FranklinWH, all backed directly by the manufacturer, not the installer — should still hold. What does not survive is any separate workmanship warranty your now-defunct installer wrote on top of it. Ask any installer you're considering, in writing, what happens to your workmanship coverage if they close.

We found no verified, primary-sourced data on installer-network size or market share for any of the three brands in California — claims of specific percentages circulating online trace to low-authority SEO content, not manufacturer or industry data, and we're not repeating them here.

Which battery fits which house

A new-build solar-plus-storage install with no existing panels is Powerwall 3's best case — the integrated hybrid inverter removes a design step and reduces installer complexity, and its per-unit output (up to 11.5 kW configurable) covers most whole-home backup needs with one or two units.

A house that already has an Enphase microinverter solar array is the clearest fit for the IQ Battery 5P — it retrofits without an AC-coupling adapter, and the distributed six-microinverter architecture means no single component failure takes the whole battery offline. It's the right call for a smaller, space-constrained install or a homeowner who wants precise control over exactly how much capacity to add, unit by 5.0 kWh unit.

A house with high simultaneous loads during an outage — a well pump plus HVAC compressor plus other heavy draws at once — and an existing non-Enphase solar inverter is the strongest case for FranklinWH's aPower 2, given its 10 kW continuous / 15 kW peak per-unit output and inverter-agnostic AC coupling. Its OSHPD seismic certification (AC 156 / OSHPD / IEEE 693-2005 high, per the aPower 2 datasheet's compliance table — the same standard used for California hospital facilities) is also a notable, if underreported, compliance data point for anyone weighing CA-specific installation standards. The tradeoff: the mandatory aGate controller adds cost, and the unit itself is the largest and heaviest of the three at 357 lb.

Which system fits NEM 3.0 export-shifting vs. whole-home backup

These are two different jobs, and the three systems aren't equally good at both.

Buying mainly to shift solar export under NEM 3.0 — storing daytime solar to use in the evening instead of exporting it for a lower credit — usually means you want to size storage to your actual evening load, not buy more capacity than you'll cycle daily. The Enphase IQ Battery 5P's 5.0 kWh module size is built for that: you add capacity in 5 kWh increments rather than committing to 13.5-15 kWh up front. A single Powerwall 3 or aPower 2 can still do export-shifting, but their per-unit capacity is sized more for backup than for a strictly evening-shifting strategy — excess capacity isn't wasted if you also want outage protection, but it's not the efficient buy if export-shifting is the only goal.

Buying mainly for whole-home backup — keeping HVAC, a well pump, an EV charger, and general household load running together during an outage — favors continuous and peak output over pure capacity. FranklinWH's aPower 2 (10 kW continuous, 15 kW peak) is built for simultaneous heavy loads from a single unit. A Powerwall 3 configured to its top continuous rating (11.5 kW) covers most whole-home scenarios with one or two units. Reaching comparable output from Enphase 5P units requires stacking several 5.0 kWh/3.84 kVA modules plus a System Controller — workable, but it's a different design path than a single higher-output unit.

Most homeowners want some of both. For sizing your own system against your actual bill and load rather than a spec sheet, see our sizing guide, How many batteries do I need in California. For the utility-by-utility export-credit math behind the NEM 3.0 side of this decision, see our battery payback under NEM 3.0 page.

Ecosystem and Installer Lock-In, Stated Neutrally

Each of these three systems ties you to specific companion hardware and, to some degree, to an installer network trained on that brand. None of this is a reason to avoid a system — it's a cost-of-switching question worth asking before you sign.

Tesla Powerwall 3 is designed around Tesla's own hardware: an integrated hybrid inverter in its native configuration, or a Backup Gateway 2 if you're adding it AC-coupled to existing solar. Expanding later generally means more Tesla-compatible hardware, and installation is typically done by Tesla-certified installers. Enphase IQ Battery 5P assumes an Enphase ecosystem — it retrofits cleanest onto an existing Enphase microinverter array, and backup mode specifically requires Enphase's IQ System Controller 3 INT. It's the only one of the three whose datasheet states an open API for third-party monitoring, which is a partial offset on the software side even though the hardware ecosystem is proprietary. FranklinWH aPower 2 requires its aGate controller as mandatory companion hardware, regardless of which solar inverter you already have. That's what makes it inverter-agnostic on the solar side — but it locks the storage system itself into FranklinWH's own controller and app.

What locks you in is the companion hardware, not the installer — ask what a future capacity add-on costs and requires before you commit to one ecosystem.

Does SGIP Eligibility Change by Which System You Pick?

No. California's Self-Generation Incentive Program pays a per-kWh rebate based on installed storage capacity, your utility territory and your household's eligibility — not on battery brand (CPUC). A 13.5 kWh Powerwall 3, a stack of Enphase 5P units totaling 13.5 kWh, and a 15 kWh aPower 2 are evaluated by the same $/Wh mechanics. What decides whether SGIP pays anything is whether your budget has money: the ratepayer-funded budgets closed to new applications at the end of 2025, and on September 23, 2026 the income-qualified AB 209 equity budget showed a waitlist for PG&E and SCE electric customers and for CSE, SoCalGas and LADWP, with only the budget for customers of publicly owned utilities in PG&E's and SCE's programs open. For the live per-utility status, see the SGIP battery rebate status page.

Brand does matter for one California incentive. PG&E's $7,500 Permanent Battery Storage Rebate requires a battery on PG&E's Qualified Product List and enrollment in the Emergency Load Reduction Program through your battery provider. PG&E names Tesla's Virtual Power Plant with PG&E and Enphase's Virtual Power Plant program as enrollment paths; other batteries go through PG&E's Automated Response Technology program. The rebate also requires five or more Wildfire Safety outages on your account since January 1, 2024.

Questions to Ask Any Installer Before You Sign

Which specific model and configuration are you quoting, and does the continuous-power number on your quote match the manufacturer's own datasheet for that configuration? Is the install AC-coupled or DC-coupled with your existing solar, and does that change the output or the companion hardware you're paying for? Is the required companion hardware — Backup Gateway 2, IQ System Controller, or aGate — included in the quoted price, or itemized separately? Is the installer a manufacturer-certified installer for this specific brand, and what happens to your workmanship warranty if their company closes? Is SGIP funding actually reserved for your project, or only “eligible” on paper — what changes on your contract if the budget closes before installation? Are you buying mainly for whole-home backup, evening export-shifting under NEM 3.0, or both — and does the system size on your quote match that goal? And what is the unit's manufacturer-stated round-trip efficiency and capacity-retention guarantee, in writing, for the exact model you're buying?