Tesla Powerwall 3 vs. Enphase IQ vs. Franklin WH10: Which Solar Battery Is Worth It in 2026?
Last updated: 2026-06-15
The Short Answer Before We Get Into It
If you already have solar and you're choosing a battery, here's where each contender lands:
- Tesla Powerwall 3 — Best all-around performer. Highest continuous power output, near-perfect efficiency, and the most mature VPP program in the U.S. Worth the premium if you want whole-home backup and long-term reliability.
- Enphase IQ Battery 5P — Best if your solar system runs on Enphase microinverters. Modular, easy to expand, and a strong VPP presence. Costs more per kWh but integrates tighter than anything else.
- Franklin WH10 — Best value per kWh. Competitive specs, a lower installed price, and a warranty that holds its own. If budget is a real constraint and you don't need the Tesla ecosystem, Franklin deserves a serious look.
Now let's run the numbers.
Capacity: What You Actually Get at Night
Marketing sheets list gross capacity. What matters is usable capacity — the energy you can actually draw before the battery cuts off to protect itself.
| Battery | Gross Capacity | Usable Capacity | Depth of Discharge |
|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | 13.5 kWh | 100% |
| Enphase IQ 5P | 5.0 kWh | 4.96 kWh | 99.2% |
| Franklin WH10 | 10.0 kWh | 10.0 kWh | 100% |
The Powerwall 3 and Franklin WH10 both advertise 100% depth of discharge. Enphase nearly matches that at 99.2%. In practice, these distinctions are minor — you're comparing 13.5, 10.0, and 5.0 kWh of real-world storage. If you need more than 5 kWh from Enphase, you'll stack two units (bringing you to ~10 kWh), which also bumps your cost.
The average U.S. home uses 28–30 kWh per day. A single battery won't cover a full outage day for most households. Two Powerwalls (27 kWh), two Franklin WH10s (20 kWh), or four Enphase IQ 5P units (20 kWh) get you closer to genuine multi-day resilience.
Power Output: What You Can Run During an Outage
Capacity is the tank. Power output is the hose. If your battery can't push enough watts, the lights work but the AC doesn't.
| Battery | Continuous Output | Peak Output |
|---|---|---|
| Tesla Powerwall 3 | 11.5 kW | 22 kW (10 sec) |
| Enphase IQ 5P | 3.84 kW per unit | 7.68 kW per unit |
| Franklin WH10 | 7.6 kW | 10.0 kW |
The Powerwall 3 dominates here. A single unit can run a 4-ton central AC, a well pump, and a refrigerator simultaneously without blinking. That 22 kW peak handles motor surge on startup — the moment that trips up weaker batteries.
The Franklin WH10 runs most home loads cleanly at 7.6 kW continuous. Two units push you to 15.2 kW, which handles nearly any whole-home scenario.
A single Enphase IQ 5P is designed for partial-home backup or homes with efficient mini-splits rather than central HVAC. Stack four units and you're at 15.36 kW continuous — more than adequate, but you've now spent more than a Powerwall.
Round-Trip Efficiency: The Hidden Cost of Every Cycle
Every time you charge a battery from solar and discharge it at night, you lose some energy to heat and conversion. That loss compounds over thousands of cycles.
| Battery | Round-Trip Efficiency |
|---|---|
| Tesla Powerwall 3 | 97.5% |
| Enphase IQ 5P | ~89% |
| Franklin WH10 | ~94% |
This isn't marketing noise — it's real money. At $0.15/kWh (a conservative U.S. average), a battery cycling once daily for 10 years loses:
- Powerwall 3: ~$35/year in conversion losses
- Franklin WH10: ~$110/year
- Enphase IQ 5P: ~$240/year per unit
Enphase's DC-coupled architecture with microinverters is more efficient than these numbers suggest in full Enphase systems — but in a mixed or AC-coupled retrofit, the 89% figure applies.
Installed Cost: What It Actually Costs to Go Live
Prices are moving, but here's a reasonable 2026 range for a standard single-family home retrofit:
| Battery | System Cost (Installed, Single Unit) | Cost per kWh |
|---|---|---|
| Tesla Powerwall 3 | $12,000–$15,000 | ~$890–$1,100/kWh |
| Enphase IQ 5P | $8,000–$10,500 per unit | ~$1,600–$2,100/kWh |
| Franklin WH10 | $9,000–$12,000 | ~$900–$1,200/kWh |
On raw cost per kWh stored, the Powerwall 3 and Franklin WH10 are neck and neck. Enphase costs significantly more per kilowatt-hour — you're paying for the modular architecture and tight ecosystem integration.
Important 2026 update: The federal 30% Section 25D ITC expired for purchased residential systems on December 31, 2025. There is no federal tax credit for battery storage purchased in 2026. The gross installed costs apply:
- Powerwall 3: $12,000–$15,000
- Enphase IQ 5P: $8,000–$10,500
- Franklin WH10: $9,000–$12,000
Check your state for applicable battery storage incentives (e.g., California's SGIP, New York's Con Edison incentives). Lease/PPA providers may still benefit from the commercial Section 48E credit through 2027.
VPP Availability: Getting Paid to Own a Battery
Virtual Power Plants (VPPs) let utilities draw from your battery during peak demand in exchange for bill credits or cash. A well-run VPP can earn you $200–$800/year, meaningfully shortening your payback period.
Tesla VPP is the most established program in the U.S. Active in California (through PG&E, SCE, and SDG&E), Texas (Octopus Energy), and expanding to Michigan, Arizona, and the Carolinas in 2026. Enrollment is managed directly through the Tesla app. Events average 10–30 per year, typically 1–4 hours each.
Enphase IQ VPP (marketed as "Grid Services") operates through utility partnerships in California, Massachusetts, New York, and Hawaii. Enphase's installer network actively coordinates enrollment. If you're in a supported territory, setup is straightforward from the Enphase app.
Franklin Electric VPP partnerships are growing but trail Tesla and Enphase in footprint. Confirmed programs exist in California and Texas as of mid-2026. If VPP earnings are a primary reason you're considering storage, Powerwall 3 is the safer bet today — Franklin is closing the gap, but the program map is smaller.
Which System Fits Your Situation
Choose the Powerwall 3 if:
- You want whole-home backup with a single unit
- You're in a Tesla VPP market and want to maximize program earnings
- You prefer a single-vendor ecosystem (solar, battery, EV charger)
- Long-term reliability is more important than upfront savings
Choose Enphase IQ 5P if:
- Your existing solar system uses Enphase microinverters
- You want to start small and expand modularly over time
- You're in an Enphase Grid Services territory
- A perfect integration between panels, inverters, and storage matters more than cost-per-kWh
Choose Franklin WH10 if:
- You want competitive specs at a lower price point
- You're not locked into a particular inverter ecosystem
- Your installer is already a Franklin dealer (installation quality matters more here than with Tesla)
- You need 10 kWh but a Powerwall 3's 13.5 kWh is more than you'll use
What to Ask Your Installer
Before you sign anything, get answers to these four questions:
- Which utility programs am I eligible for? Incentive availability varies by utility, not just state. Your installer should know which VPP, SGIP, or local rebates apply to your address.
- What's the all-in installed cost, and what does that include? Panel upgrades, permit fees, and monitoring subscriptions add up fast.
- How is the system sized for my actual usage? A good installer pulls your last 12 months of utility bills — not a generic estimate.
- What's the warranty and who handles service calls? Tesla warranties through Tesla directly. Enphase and Franklin work through certified installers — ask what the local service response time looks like.
Our Pick for Most Homeowners
The Tesla Powerwall 3 earns its spot at the top of this comparison in 2026. The combination of 11.5 kW continuous output, 97.5% efficiency, and the most accessible VPP program in the country makes it the right choice for most homeowners who want meaningful backup coverage and a clear path to returns.
The Franklin WH10 is the sleeper of this comparison. If a Powerwall installer isn't available in your area, or if your project budget won't stretch to Powerwall pricing, Franklin delivers 74% of the storage at a meaningfully lower installed cost. Don't overlook it.
Compare Current Solar Battery Quotes
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