Powerwall 3 vs Enphase vs FranklinWH: Compare the Whole System
Tesla Powerwall 3, Enphase IQ Battery and FranklinWH aPower 2 compared on usable kWh, power, installed cost, expansion, warranty and backup design.
Comparison
Quick answer: Powerwall 3 is the strongest default for a high-power 13.5 kWh single unit and lower installed cost per kWh. Enphase is the modular choice, especially with existing Enphase solar, but several 5P units and the System Controller can make whole-home backup expensive. FranklinWH aPower 2 gives 15 kWh and a strong whole-home design with a longer published warranty, but local certified-installer depth matters.
Best for
US homeowners with Tesla, Enphase or FranklinWH battery proposals in hand.
Wrong fit
Off-grid systems, portable power stations or buyers comparing only sticker prices without backup scope.
Tradeoff
Tesla leads on power and price, Enphase on modular serviceability, and FranklinWH on large-cabinet whole-home design and warranty length.
Tesla Powerwall 3, Enphase IQ Battery and FranklinWH aPower 2 can all back up a home. They do it with different architectures, and those differences matter more than a brand ranking.
Powerwall 3 is a large, high-power battery with an integrated solar inverter. Enphase builds capacity in smaller AC-coupled modules. FranklinWH pairs a large 15 kWh cabinet with the required aGate controller. Compare the complete design, not three battery boxes.
Quick comparison
Decision
Tesla Powerwall 3
Enphase IQ Battery 5P
FranklinWH aPower 2
Usable capacity
13.5 kWh
5.0 kWh per unit
15 kWh
Continuous output
11.5 kW
3.84 kW per unit
10 kW product-page claim
Architecture
Hybrid inverter with solar inputs
AC-coupled, modular
AC home-power system with aGate
Typical 2026 installed lane
About $13,000-$16,500
About $5,500-$6,500 per 5P; backup controller can push one-unit design to $7,500-$9,500
About $15,000-$20,000 with aGate
Published warranty
10 years; 70% capacity at year 10 for covered use
15 years or 6,000 cycles on 5P
15 years or 60 MWh, registration required
Best fit
High power, solar-plus-storage, common ecosystem
Existing Enphase solar and staged expansion
Larger single cabinet and whole-home control
Main quote risk
Backup scope, service queue and expansion power
Small sticker hides controller and stacked-unit cost
aGate and load-management scope buried in one line
Pricing is a planning range from July 2026 source checks, before local incentives. It is not a quote. Panel work, backup switchgear, conductor runs, permits and the chosen loads can move any proposal by thousands.
Powerwall 3: the default high-power value
One Powerwall 3 provides 13.5 kWh usable capacity and Tesla lists 11.5 kW continuous AC output. That makes a single cabinet unusually capable of starting and carrying larger household loads. Its integrated solar inputs also make it a natural solar-plus-storage proposal.
The value case is strongest when a certified installer can deliver the complete system near the lower end of the $13,000 to $16,500 planning range. Tesla-direct pricing pulled in early 2026 ran higher in several markets, while marketplace quotes showed that third-party certified installers can be more competitive.
Expansion units add 13.5 kWh at a lower incremental cost because they share the Powerwall 3 inverter. That adds runtime, not inverter output. If the first cabinet cannot start the proposed load, adding only energy does not solve the power problem.
Choose Powerwall 3 when: a high-power single unit covers the load plan, the installer and service path are credible, and the quote clearly identifies Backup Gateway or utility-approved Backup Switch scope.
Watch: a proposal that assumes virtual-power-plant revenue or incentives without current program terms, or a system that depends on internet connectivity without explaining offline backup behavior and warranty requirements.
Enphase: the modular and serviceable choice
The IQ Battery 5P stores 5 kWh and provides 3.84 kW continuous output per unit. That smaller module is useful when the homeowner wants to start small, add in 5 kWh increments or stay inside an existing Enphase solar ecosystem. AC coupling also makes retrofit design straightforward in many homes.
The trap is comparing one $5,500-to-$6,500 installed 5P with a 13.5 or 15 kWh cabinet. Whole-home backup needs enough battery units for both energy and power, plus the IQ System Controller. A one-unit backup-capable design can land closer to $7,500 to $9,500; two and four-unit stacks move the total quickly.
Enphase's distributed microinverter architecture can be field-serviceable at a module level, and the 5P carries a published 15-year or 6,000-cycle warranty. Confirm generation: older IQ Battery 10 equipment can have different power and warranty terms, while the newer IQ Battery 10C is another current comparison.
Choose Enphase when: you already own Enphase solar, value staged expansion or serviceable modules, and the stack meets both outage runtime and motor-start needs at a fair complete-system price.
Watch: a low battery-only line followed later by System Controller, combiner, load control and additional-unit costs.
FranklinWH: the large-cabinet whole-home choice
FranklinWH aPower 2 stores 15 kWh and publishes 10 kW continuous output. The required aGate handles backup, load management and system coordination. That makes FranklinWH compelling for buyers who want a whole-home design built around one larger cabinet and explicit load control.
The planning range is about $15,000 to $20,000 for one aPower 2 with aGate before incentives. Because aGate is required, the first battery carries more control-system cost; additional cabinets can improve the expansion economics.
FranklinWH publishes a 15-year or 60 MWh warranty for aPower 2. Registration is not paperwork to leave vague: the effective November 2025 end-user warranty states that an unregistered system receives only four years. The local certified installer therefore matters twice - for installation and for preserving the warranty path.
Choose FranklinWH when: the 15 kWh cabinet and aGate load-control design fit the outage plan and a proven local certified installer will support it.
Watch: quotes for legacy first-generation aPower at current-product pricing, and proposals that bundle aGate, panel work and load controls so the system cannot be compared line by line.
Compare equivalent backup, not equivalent kWh
Before comparing totals, make each bidder mark the same loads:
HVAC compressor and electric heat strips.
Well pump, sump pump and septic equipment.
Refrigerator, freezer and kitchen circuits.
Medical, office and network loads.
EV charging and electric water heating.
Desired outage hours and minimum reserve.
Then require the continuous power, short-duration motor-start capability, usable energy at the proposed reserve and the load-shedding sequence. A battery can have enough kWh for a long outage but not enough kW to start a motor. The reverse can also happen.
Powerwall 3 is the best starting benchmark for most solar-plus-storage buyers because one cabinet combines 13.5 kWh with high output and competitive installed pricing. Enphase wins when modularity, existing Enphase equipment and field-serviceable architecture are worth stacking smaller units. FranklinWH wins when a 15 kWh cabinet, aGate control and a 15-year registered warranty fit the whole-home plan and local installer depth is strong.
The best quote is the one that covers the same loads, names every control component and survives a price-per-usable-kWh and price-per-backed-up-load comparison.
Frequently Asked Questions
Is FranklinWH better than Tesla Powerwall 3?
FranklinWH offers more usable capacity per cabinet and a longer published warranty, while Powerwall 3 offers higher listed continuous output and is often cheaper installed. Local installer support and the complete backup design decide the better system.
How many Enphase 5P batteries equal one Powerwall 3?
Three IQ Battery 5P units provide 15 kWh, slightly more energy than one 13.5 kWh Powerwall 3. They also provide 11.52 kW continuous in aggregate. Compare the required System Controller and installation cost, not just the arithmetic.
Which battery is cheapest per kWh?
Powerwall 3 is usually the lowest installed-cost-per-kWh benchmark among these three. A real quote can reverse that if Tesla service scope is expensive, an Enphase system reuses existing equipment or FranklinWH expansion shares an existing aGate.
Which has the best warranty?
Enphase 5P and FranklinWH publish 15-year terms, with cycle or throughput limits and conditions. Powerwall 3 publishes 10 years with 70 percent capacity retention for covered use. Registration, operating mode, connectivity and labor coverage still need to be read separately.
These guides are built from public specifications, primary program pages, utility documentation, manufacturer materials, and repeated buyer questions that show up in quote and installation decisions.
Manufacturer and installer responses can clarify pricing bands, warranty terms, support footprint, and common mistakes. They do not move a page up the shortlist on their own.
