The Tesla Powerwall 3 and the Enphase IQ Battery 5P are the two home batteries installers quote most in 2026. Tesla gives you one big 13.5 kWh box with serious power output; Enphase gives you stackable 5 kWh modules with a 15-year warranty. This guide compares the numbers that matter so you can choose with confidence.
- The Powerwall 3 stores 13.5 kWh and delivers 11.5 kW of continuous power, enough to start most central air conditioners. The Enphase 5P stores 5 kWh per unit at 3.84 kW continuous; you stack units to match Tesla’s output.
- One Powerwall 3 typically costs $11,000 to $16,000 installed. A single Enphase 5P runs $9,000 to $12,000, but most homes need two or three 5Ps to equal one Powerwall.
- Both use LFP (lithium iron phosphate) chemistry, which handles heat and daily cycling better than older chemistries.
- Enphase wins on warranty (15 years vs 10). Tesla wins on simplicity: one unit, one app, and a built-in solar inverter.
The short answer
For most houses, the Powerwall 3 is the stronger pick if you want whole-home backup that can start a central air conditioner from a single box. The IQ Battery 5P is better if you already have Enphase microinverters, want to start small and expand later, or value the 15-year warranty for daily cycling. Neither is a bad battery: both are LFP-based and both come from companies likely to be around to honor warranties.
The decision comes down to three things: how much power you need at once (air conditioning decides this in most homes), how much storage you want (one Powerwall equals about two and a half 5Ps), and which platform your installer knows best. Price ends up closer than it first looks once you size both systems to do the same job. Our Powerwall 3 cost breakdown shows what installers actually charge line by line.
Head-to-head specifications
Here are the published specs side by side. Treat manufacturer numbers as the ceiling: real output depends on temperature, wiring, and configuration.
| Specification | Tesla Powerwall 3 | Enphase IQ Battery 5P |
|---|---|---|
| Usable capacity | 13.5 kWh | 5.0 kWh per unit |
| Continuous power | 11.5 kW | 3.84 kW per unit |
| Peak power | 30 kW (10 seconds) | 7.68 kW (10 seconds) per unit |
| Chemistry | LFP | LFP |
| Coupling | DC-coupled, built-in hybrid solar inverter | AC-coupled, pairs with IQ8 microinverters |
| Round-trip efficiency | Around 90 percent | Around 90 percent |
| Expandability | Up to 4 units (54 kWh) | Stack units, commonly up to 20 to 40 kWh |
| Warranty | 10 years | 15 years |
The Powerwall 3’s headline advantage is power: 11.5 kW continuous from one unit runs a typical home, including a 3 to 4 ton air conditioner. Matching that with Enphase takes three 5P units (11.5 kW combined, 15 kWh of storage). Tesla publishes specs at tesla.com/powerwall; Enphase publishes the 5P datasheet at enphase.com.
Enphase’s advantage is granularity. One 5P covers evening self-consumption for a modest home, two cover most essentials through an outage, three handle serious backup. With Tesla, your increment is a whole Powerwall, so expanding later is a bigger financial step than adding a third 5P.
Installed cost breakdown
Battery pricing varies widely because labor, electrical work, and gateway hardware differ by house. Typical 2026 US installed ranges, before any incentives:
| Configuration | Typical installed cost | Usable storage |
|---|---|---|
| 1x Tesla Powerwall 3 | $11,000 to $16,000 | 13.5 kWh |
| 1x Enphase IQ Battery 5P | $9,000 to $12,000 | 5.0 kWh |
| 2x Enphase IQ Battery 5P | $16,000 to $21,000 | 10.0 kWh |
| 3x Enphase IQ Battery 5P | $22,000 to $29,000 | 15.0 kWh |
Per kilowatt-hour, the Powerwall 3 usually works out cheaper at common sizes because you buy one enclosure, one gateway, and one installation visit instead of two or three. Enphase can still win at the small end: if 5 kWh for evening time-of-use shifting is all you want, a single 5P costs less than a Powerwall.
Watch for buried adders: main panel upgrades ($1,500 to $4,000), trenching or long wire runs, and critical-load subpanels. A good quote lists the battery, gateway, labor, and electrical work separately. Note the federal 25D credit ended for systems installed after December 31, 2025, so 2026 installs do not get the 30 percent credit. State and utility incentives may still apply; check DSIRE for your state.
Real backup time and power
Capacity (kWh) decides how long you run; power (kW) decides what you can run at once. Homeowners mix these up more than anything else in battery shopping.
Take realistic essentials: refrigerator (150W average), LED lights (120W), wifi and phones (50W), laptop and TV (200W), fans (150W). That is about 670 watts. A 13.5 kWh Powerwall 3 typically carries that load for 18 to 24 hours with no solar recharge, and indefinitely if panels recharge it daily. Two 5Ps (10 kWh) give roughly 12 to 18 hours on the same loads. Our runtime math guide works through more combinations.
Air conditioning changes the math. A 3-ton central AC draws about 3.5 kW running and needs a big surge to start. One Powerwall 3 (11.5 kW continuous, 30 kW surge) starts it comfortably. One 5P (3.84 kW) does not; you need at least two, and three is the comfortable answer. If whole-home backup with AC is the goal, compare systems that can actually do it: one Powerwall 3 versus three 5Ps.
During extended outages, solar recharge matters more than battery size. Both systems recharge from your panels by day, so a smaller battery with a decent array can outlast a bigger battery with no recharge. Size the battery for the night and let the panels handle the day. Our 3-day outage sizing guide turns a load list into a kWh target.
Installation and expandability
A Powerwall 3 install is straightforward: one wall-mounted unit (about 130 pounds), a Backup Gateway or Backup Switch for grid disconnection, and wiring. Because the solar inverter is built in, pairing it with new panels can mean fewer boxes on the wall than a separate inverter plus battery.
Enphase is modular by design. Each 5P wires into your Enphase system through the combiner and system controller. If you already have IQ8 microinverters, adding a 5P is one of the cleanest retrofits available: same app, same monitoring, same installer skill set. Starting from scratch, the Enphase route means more components, which is part of why multi-unit quotes run higher.
Both platforms allow adding units later, but confirm wall space and electrical capacity for future units now. Batteries stack happiest with identical units, so get the phased-expansion answer in writing if that is your plan.
Warranty and chemistry
Both use LFP cells, which tolerate heat better than the NMC chemistry in older home batteries, handle deep daily cycling with less degradation, and have a stronger safety record. If the battery will live in a hot garage in Texas or Arizona, LFP is what you want. Our LFP vs NMC guide goes deeper.
The warranty gap is Enphase’s clearest win: 15 years on the 5P versus 10 years on the Powerwall 3. Both guarantee minimum retained capacity (typically 60 to 70 percent at end of warranty). Five extra years matters most if you cycle daily for time-of-use savings, since daily cycling is what wears batteries down. If the battery mostly sits in reserve for outages, the gap matters less.
Powerwall 3: Pros
- 13.5 kWh and 11.5 kW from one unit, starts central AC
- Built-in hybrid solar inverter simplifies new installs
- Lower cost per kWh at common system sizes
- Huge installed base, mature service process
Powerwall 3: Cons
- 10-year warranty vs Enphase’s 15
- Big 13.5 kWh increment, less flexible sizing
- Mixed reputation for Tesla customer service
- Less ideal with existing Enphase microinverters
Enphase 5P: Pros
- 15-year warranty, best in class
- Modular 5 kWh steps, start small and expand
- Seamless with existing Enphase IQ8 systems
- Excellent monitoring in the Enphase app
Enphase 5P: Cons
- One unit cannot start central AC
- Matching Powerwall output needs 3 units at higher cost
- More boxes on the wall, more wiring
Which battery should you buy
Choose the Powerwall 3 if you want whole-home backup including air conditioning from a single unit, you are installing solar and battery together, or you want the lowest cost per kWh at 13.5 kWh and up. That describes most suburban homes with central AC.
Choose the Enphase IQ Battery 5P if you already have Enphase microinverters, you want to start with 5 to 10 kWh and expand later, or your backup needs are modest. Want a third option? Our Powerwall 3 vs FranklinWH comparison covers the aPower 2.
Still deciding between one and two units? Read is one Powerwall enough next. Adding storage to existing panels? See adding a battery to an older system.
Related battery guides
- How Much Does a Tesla Powerwall 3 Really Cost With Installation
- Is One Powerwall Enough, or Do You Need Two
- What Size Home Battery Do You Need for a 3-Day Outage
- How Long Will a 13.5 kWh Battery Run Your Fridge, Lights and Wifi
- Can You Add a Battery to Solar Panels Installed 5 Years Ago
- Tesla Powerwall 3 vs FranklinWH aPower 2: Which Battery Wins in 2026
- AC-Coupled vs DC-Coupled Storage: The Retrofit Question Every Owner Faces
- LFP vs NMC Batteries: Which Chemistry Lasts Longer in a Hot Garage
- Do Home Batteries Pay for Themselves Without Net Metering
- What Happens to Solar Panels During a Power Outage
- Do Solar Panels Work During a Blackout Without a Battery
Can a single Enphase 5P run a whole house?
No. At 3.84 kW continuous, one 5P cannot run a whole house with central air conditioning. Two to three units can, depending on loads. For whole-home backup with AC, three 5Ps or one Powerwall 3 are the realistic options.
Is the Powerwall 3 compatible with existing solar panels?
Yes, it can retrofit to most existing systems, though its built-in hybrid inverter adds the most value in new solar-plus-storage installs. For older systems, an AC-coupled battery like the Enphase 5P is sometimes the simpler retrofit.
Do these batteries qualify for the federal tax credit in 2026?
The 25D residential credit ended for systems installed after December 31, 2025, so a battery installed in 2026 does not qualify. Confirm any remaining incentive options with a tax professional.
How long do these batteries last?
Both use LFP chemistry, typically rated for 6,000 or more full cycles. Cycling once daily, that suggests 15-plus years of useful life with gradual capacity loss. Warranties guarantee minimum retained capacity: 10 years for Tesla, 15 for Enphase.
Can I install a home battery myself?
No. Both require permitting, utility interconnection, and licensed electrical work, including a gateway that safely disconnects your home from the grid during outages. DIY installs void the warranty.
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