Home battery storage has become one of the fastest-growing parts of residential solar — battery attach rates on new solar installations have grown from roughly 12% in 2022 to over 31% in 2026 — but choosing among half a dozen genuinely competitive platforms, at prices ranging from $8,000 to over $20,000, is a real decision, not a formality. This guide compares the leading home battery systems on the specs that actually matter: usable capacity, continuous power output, efficiency, warranty, and realistic installed cost.
The Leading Home Battery Systems, Compared
Tesla Powerwall 3 — The Industry Baseline
- Usable capacity: ~13.5 kWh
- Continuous power output: 11.5 kW
- Round-trip efficiency: ~96.5%
- Warranty: 10 years
- Installed cost: roughly $12,000-$17,000
The Powerwall 3 remains the most recognized name in the category, and for good reason — it’s a single, fully integrated unit combining a hybrid inverter, battery, and home power management system, which simplifies installation for new solar systems in particular. Its continuous power output is among the highest of any single unit on this list, meaning it can support demanding simultaneous loads (AC plus a large appliance) without needing multiple units stacked together. It also integrates with Tesla’s broader ecosystem, including vehicle-to-home charging coordination for Tesla EV owners and automated “storm watch” charging that tops up the battery ahead of severe weather forecasts pulled from the National Weather Service.
Best for: New solar installations, Tesla EV owners, and homeowners who want a single all-in-one unit rather than a modular, stackable system.
For the latest technical details and warranty conditions, check the official Tesla Powerwall specifications.
Enphase IQ Battery 5P / 10C — Best for Modularity and Efficiency
- Usable capacity: 5.0 kWh per unit (5P), stackable up to 4 units (20 kWh); 10C model offers a larger single-unit option
- Continuous power output: 3.84 kW per 5P unit (up to ~15.4 kW combined across 4 units)
- Round-trip efficiency: ~96%, among the highest of any system compared here
- Warranty: 10-15 years depending on the specific model
- Installed cost: roughly $13,000-$17,000 for a capacity comparable to a single Powerwall 3
Enphase takes a fundamentally different, modular approach — rather than one large unit, homeowners typically stack multiple smaller battery units to reach their desired capacity. This is a natural fit for homes already using Enphase microinverters, since the system integrates seamlessly with existing Enphase solar equipment. The modular design also allows for precise capacity sizing (adding exactly 5 kWh increments rather than being locked into a single unit’s fixed size) and offers some of the best round-trip efficiency figures in the category, which compounds into meaningful additional retained energy over a 15-year span compared to slightly less efficient alternatives.
Best for: Homes already using Enphase microinverters, homeowners who want precise, incremental capacity sizing, or anyone prioritizing maximum efficiency.
For model-specific capacity and output ratings, consult the official Enphase IQ Battery 5P datasheet.
FranklinWH aPower 2 / aPower S — Best for Whole-Home Backup and Generator Integration
- Usable capacity: ~13.6-15 kWh per unit
- Continuous power output: 5-10 kW per unit, scalable up to 15 units for larger installations
- Warranty: commonly 12-15 years, among the longest in the category
- Installed cost: competitive with Powerwall 3, varies by configuration
FranklinWH has built a strong reputation specifically around AC-coupled retrofits — adding battery storage to an existing solar system without needing to replace or heavily modify the existing inverter setup — and around genuinely robust whole-home backup capability for larger homes with demanding loads (multiple HVAC zones, well pumps, or other heavy equipment). Installers who work hands-on with multiple brands frequently cite FranklinWH as having the easiest generator integration of any system in this category, which matters for homeowners wanting a backup strategy that combines battery storage with a standby generator for extended outages.
Best for: Retrofitting battery storage onto an existing solar system, larger homes needing substantial backup power, and homeowners wanting integrated generator support.
Sonnen ecoLinx — Premium, Software-Forward Option
Sonnen’s ecoLinx line positions itself at the premium end of the category, with a strong emphasis on smart software, grid-services participation, and long-term reliability. It typically commands a price premium over Tesla, Enphase, and FranklinWH for comparable capacity, appealing most to homeowners prioritizing advanced energy management features and a company with a long-standing focus specifically on battery technology (rather than batteries as an add-on to a broader solar product line).
Best for: Homeowners prioritizing advanced software control and grid-services participation over the lowest possible price point.
For current product details and energy management features, visit the official sonnen website.
LG Energy Prime+ — Best Value Option
LG’s Prime+ line is frequently cited as a strong value pick — competitive capacity and a 10-year warranty at a price point generally below Tesla, Enphase, and FranklinWH, making it a reasonable choice for budget-conscious homeowners who still want a reputable, established manufacturer rather than an unproven newer brand.
Best for: Homeowners prioritizing lower upfront cost without dropping to a less-established manufacturer.
For current product information and availability, visit the official LG website.
EcoFlow Delta Pro 3 — Portable, Low-Commitment Option
Unlike the fixed, professionally-installed systems above, the EcoFlow Delta Pro 3 is a portable battery station that can be charged via solar panels, a wall outlet, or a generator, without requiring a permanent electrical installation. It offers meaningfully less capacity and backup capability than a whole-home system, but it’s a genuinely accessible entry point for renters, those testing out battery backup before committing to a full installation, or anyone wanting emergency power flexibility without a multi-thousand-dollar permanent project.
Best for: Renters, temporary/emergency backup needs, or anyone wanting to try battery storage without a permanent installation commitment.
For detailed specifications and current product information, visit the official EcoFlow DELTA Pro 3 product page.
Quick Comparison Table
| System | Usable capacity | Continuous power | Warranty | Best for |
|---|---|---|---|---|
| Tesla Powerwall 3 | ~13.5 kWh | 11.5 kW | 10 years | New installs, Tesla EV owners |
| Enphase IQ Battery 5P/10C | 5-20+ kWh (modular) | 3.84-15.4 kW | 10-15 years | Enphase systems, precise sizing |
| FranklinWH aPower 2/S | ~13.6-15 kWh/unit | 5-10 kW/unit | 12-15 years | Retrofits, whole-home backup |
| Sonnen ecoLinx | Varies (premium) | Varies | Varies | Advanced software, grid services |
| LG Energy Prime+ | Competitive | Competitive | 10 years | Best value |
| EcoFlow Delta Pro 3 | Lower (portable) | Lower | Standard portable warranty | Renters, portable/emergency use |
Smart Features Worth Paying For (and Ones That Aren’t)
- Time-of-use optimization (genuinely valuable): if your utility charges different rates by time of day, a battery that automatically charges during cheap off-peak hours and discharges during expensive peak hours can meaningfully reduce your bill — Tesla, Enphase, and Sonnen all handle this well.
- Storm watch / severe weather pre-charging (genuinely valuable in storm-prone areas): automatically charging the battery to full ahead of forecasted severe weather, offered by Tesla, Franklin, and Enphase in similar forms, can be the difference between comfortably riding out a multi-day outage and running low on backup power partway through.
- Vehicle-to-home / EV integration (valuable specifically if you own a compatible EV): Tesla’s ecosystem integration with its own vehicles is the most mature version of this feature currently available.
What About the Federal Tax Credit?
It’s worth being direct about this, since some battery marketing content hasn’t caught up: the 30% federal tax credit for homeowner-owned battery storage expired December 31, 2025, the same date as the residential solar panel credit. If you’re purchasing a battery outright or with a loan in 2026, there is no federal discount applied to the price — the installed costs cited above are effectively your real cost, before any state or local incentives that may still apply. Third-party-owned battery systems (installed as part of a lease or specific commercial arrangement) may still qualify for a separate credit claimed by the system owner, not you directly. For the full explanation of the rules and remaining options, see our guide to the 2026 federal solar tax credit.
How to Choose the Right Battery for Your Home
- Check your existing solar equipment. If you already have Enphase microinverters, an Enphase battery offers the most seamless integration; if you’re doing a new installation, you have more flexibility to choose based on other factors.
- Decide between a retrofit and a new install. FranklinWH’s AC-coupled design is specifically well-suited to adding storage to an existing system without inverter replacement.
- Size for your actual backup goals, not just the largest available capacity — essential-loads-only backup (refrigerator, some lighting, internet) requires meaningfully less capacity than whole-home backup including HVAC and other heavy loads.
- Check your utility’s rate structure. If you’re on a strong time-of-use plan or face weak net metering, prioritize a system with well-developed TOU optimization software, since this directly affects your realized savings.
- Get multiple installer quotes for the same target capacity, since installed pricing varies meaningfully by installer, region, and whether the battery is being added to a new or existing solar system.
Final Thoughts
There’s no single “best” home battery for every household — Tesla Powerwall 3 remains the most recognized all-in-one option and a strong default for new installations, Enphase is the clear choice for homes already invested in its microinverter ecosystem and for those wanting precise modular sizing, and FranklinWH has built a genuine edge for retrofits and whole-home backup with generator integration. Whichever system you’re considering, factor in the reality that the federal tax credit no longer applies to a homeowner-owned purchase in 2026, and weigh installed cost, warranty length, and your specific backup goals together rather than choosing based on brand recognition alone.