⚠️ 2026 update on the federal tax credit
The 30% federal residential solar tax credit (Section 25D) expired on December 31, 2025 for systems you buy with cash or a loan. Cost and savings figures on this page that assume that credit may be out of date. Two things still apply: Nevada's sales-tax and property-tax exemptions and NV Energy net metering, and systems on a lease or PPA may still qualify for a federal incentive through the end of 2027. For numbers that reflect today's incentives, book a free review and talk to a tax professional about your situation.
For most homes pairing solar with a battery in 2026, Tesla Powerwall 3 is the default winner on price-per-kWh and whole-home backup capability, Enphase IQ Battery 5P is the right pick for AC-coupled retrofits and microinverter-based systems, and LG ESS Home 8/16 fits homeowners who want the longest cycle warranty on the market. None of the three is a bad choice — they target slightly different use cases.
The Three Batteries Worth Comparing
| Spec | Tesla Powerwall 3 | Enphase IQ Battery 5P | LG ESS Home 8 (16) |
|---|---|---|---|
| Usable capacity | 13.5 kWh | 5.0 kWh (modular) | 14.4 kWh (one battery, 16 kWh hub) |
| Continuous power | 11.5 kW | 3.84 kW | 7.5 kW |
| Peak power | 15.4 kW | 6.14 kW (10 sec) | 9.0 kW (10 sec) |
| Coupling | Hybrid (DC + AC) | AC only | DC + AC options |
| Round-trip efficiency | 89% | 90% | 94.5% |
| Warranty | 10 years, unlimited cycles | 15 years / 6,000 cycles | 10 years / 60% capacity |
| Indoor/outdoor | Both | Both | Both |
| Approx installed cost | $11,500–13,500 | $5,500–6,800 per 5kWh | $13,500–16,000 |
Tesla Powerwall 3 — The Default Whole-Home Battery
Powerwall 3 collapsed the inverter and battery into one unit, which is why it's price-competitive against AC-coupled systems even though it has more silicon inside. Six built-in MPPT inputs accept up to 20 kW of solar DC directly, so on new builds you skip the separate string inverter entirely. The 11.5 kW continuous output handles whole-home backup including AC startup on most Vegas homes — meaning you can run the central air during a grid outage, which Powerwall 2 couldn't reliably do.
The 10-year warranty has unlimited cycles. That matters in Las Vegas because if you're doing daily NEM 3.0-style time-shift cycling (more relevant to my California clients), other warranties cap at 6,000 cycles. Powerwall doesn't.
Best fit: new solar + storage builds, whole-home backup priority, Tesla EVs, single-battery homes. See my battery storage page for project examples.
Enphase IQ Battery 5P — The Modular AC-Coupled Option
The 5P is built around the same micro-architecture philosophy as Enphase microinverters — multiple smaller units working in parallel rather than one big box. You buy capacity in 5 kWh increments. Most homes I install land at two batteries (10 kWh) or three (15 kWh). The continuous power per battery is 3.84 kW, so two batteries put out 7.68 kW continuous — enough to run AC if you don't simultaneously hammer the dryer.
The strength of the 5P is retrofit. If you already have an Enphase microinverter system and want to add storage, the 5P slots in cleanly without changing your solar inverter setup. AC-coupled means the battery has its own inverter built in, which costs about 2% in round-trip efficiency versus DC-coupled but eliminates the wiring complexity. The 15-year warranty is the longest in this comparison.
LG ESS Home 8 / 16 — The Long-Life Option
LG's 2026 ESS Home line uses LFP (lithium iron phosphate) chemistry, same as Powerwall 3 and Enphase 5P. Round-trip efficiency is the highest of the three at 94.5%. The Home 8 is a single 14.4 kWh battery; the Home 16 hub takes two of those for 28.8 kWh of usable capacity.
The catch: LG's warranty is by capacity retention (60% at year 10) rather than unlimited cycles, and LG had a high-profile residential battery recall in 2021–2022 that's still in the back of installer minds. The current LFP product is a new chemistry and a new manufacturing line, but warranty service infrastructure is thinner than Tesla or Enphase. Best fit: technical homeowners who want efficiency and don't mind being slightly off the well-trod path.
What "Whole-Home Backup" Actually Means
"Whole-home" only works if your battery's continuous power output exceeds your home's instantaneous load. A typical Las Vegas summer afternoon with the AC running pulls 4–6 kW. AC compressor startup spikes to 8–10 kW for 1–2 seconds. Pool pumps add 1–2 kW. Electric clothes dryer adds 5 kW.
What this means in practice:
- Powerwall 3 at 11.5 kW continuous handles AC + most baseline loads. Avoid running AC + dryer + pool simultaneously.
- One Enphase 5P at 3.84 kW won't run central AC reliably. Two 5P batteries (7.68 kW) will. Three (11.5 kW) is bulletproof.
- LG ESS Home 8 at 7.5 kW handles AC but not AC + heavy concurrent load.
If you only want partial backup (lights, fridge, a few outlets, no AC), one of any of the three is plenty.
How Long Does a Battery Run Your House?
Usable capacity divided by load. A 13.5 kWh Powerwall 3 supporting a 1.5 kW average overnight load runs ~9 hours. With AC running heavy at 4 kW average, it lasts 3.4 hours. With essentials only at 600W, it lasts 22 hours. These numbers assume the battery starts full — which on a sunny day, paired with a solar array and the right management settings, it usually does.
The Federal Battery Tax Credit Has Ended
Heads up: the 30% federal Residential Clean Energy Credit that covered standalone and solar-paired battery storage expired December 31, 2025 for systems a homeowner buys with cash or a loan. So don't budget a credit back on a Powerwall 3 or an Enphase 5P anymore — the cash price is the price. A lease or PPA (third-party-owned) setup can still capture a federal incentive through the end of 2027, but for an owned battery that money is gone. The case for storage now rests on outage protection, EV charging, and self-consumption value, not a tax break. The DOE outlines the broader policy at energy.gov/eere/solar.
Where Batteries Actually Pencil Out in Nevada vs. California
Two very different cases:
- Nevada (NV Energy Tier 4): Net metering credit is 75% of retail. Battery arbitrage saves you the 25% spread, which is real but not life-changing — about $250–$400/year of value on top of solar. The case for batteries here is outage protection and EV charging optimization, not financial arbitrage.
- California (NEM 3.0): Exports pay avoided-cost (~$0.05–$0.08/kWh) instead of retail. Self-consuming via battery saves you the difference between retail and export rate — typically $0.20–$0.30/kWh. Batteries here pencil out on arbitrage alone. See my California solar page.
Stacking Batteries — How Many Make Sense?
For most Vegas homes I install one Powerwall 3 (13.5 kWh) or two Enphase 5P (10 kWh) and that's enough. Going to two Powerwalls (27 kWh) makes sense if you have a pool, an EV that charges off the battery during outages, or you want multi-day backup. Beyond that, you're spending $11,000+ for marginal additional security — usually a generator is the cheaper answer for true multi-day resilience.
Installation Time and Permitting
Battery installs in Las Vegas/Henderson typically take 1 day for a Powerwall 3 retrofit, 1–2 days for an Enphase multi-battery install. Permitting through Clark County adds 2–4 weeks on top of solar permitting. Inspector wants to see the rapid shutdown switch, the disconnect labels, the manufacturer's instructions on site, and code-compliant clearances. Clark County's Building department publishes the residential energy storage requirements online.
The Bottom Line
For new Las Vegas solar + storage builds: Tesla Powerwall 3 wins on price, power, and warranty. For Enphase microinverter retrofits: Enphase IQ Battery 5P. For homeowners who want LFP chemistry with the highest round-trip efficiency and longest cycle warranty: LG ESS Home. None of these is the wrong answer — but the right answer depends on your inverter architecture, your backup priorities, and your roof's existing solar setup. Tell me what you have today and I'll spec the right battery for it.