Tesla Powerwall 3 vs Enphase IQ vs FranklinWH: 2026 Solar Battery Comparison

If you've decided a battery is worth it (see our honest "do you need one" guide first), there are really only three contenders worth your money in 2026. Here's the spec-by-spec.

The three contenders

All three use LFP chemistry — safer and longer-cycle-life than older NMC lithium. Good baseline.

Tesla Powerwall 3

Strengths: Highest continuous output (11.5 kW) means it can actually start a central AC compressor — huge in Florida. Built-in solar inverter means fewer components if you're doing solar + battery together. Best price-per-kWh of the three.

Watch-outs: 10-year warranty is the shortest here. Tesla's install timelines run long (3-6 months common). You're locked into the Tesla app ecosystem.

Best for: Most Florida whole-home backup needs, especially if you want to run AC during an outage.

Enphase IQ Battery 5P

Strengths: Modular — start with one 5 kWh unit, add more later. Industry-best 15-year warranty. Pairs natively with Enphase microinverters (if your solar uses Enphase, this is the seamless choice). Per-panel-level architecture is very reliable.

Watch-outs: Lower continuous output per unit (3.84 kW) — you need 2-3 units to run an AC, which raises the total price above Powerwall. Most expensive per usable kWh when stacked.

Best for: Homeowners who already have Enphase microinverters, want to start small and expand, or prioritize the longest warranty.

FranklinWH aPower

Strengths: Whole-home backup with excellent smart energy management (the FranklinWH "aGate" handles generator integration, smart load shedding). 13.6 kWh usable matches Powerwall. Growing installer network.

Watch-outs: Less brand recognition (matters for resale + long-term support confidence). 5 kW continuous is solid but below Powerwall 3 for heavy AC loads.

Best for: Homeowners who want sophisticated load management or plan to integrate a backup generator.

What I'd pick (Florida)

For most Florida homes wanting hurricane backup: Tesla Powerwall 3. The 11.5 kW continuous output is the differentiator — it's the one most likely to actually run your central air during a multi-day outage, which is the whole point in Florida heat. Best price too.

If you already have Enphase microinverters: Enphase IQ for the seamless ecosystem + 15-yr warranty, accepting the higher cost.

If you want smart generator integration: FranklinWH.

The install gotchas reps won't mention

1. One battery rarely powers your whole home for long. It covers critical loads (fridge, outlets, internet, maybe one AC zone) through an outage. Reps selling "whole-home for days" usually mean 2-3 batteries — confirm the load math.
2. Backup loads panel. Most installs put backup circuits on a separate sub-panel. Make sure the circuits YOU care about (fridge, well pump, CPAP) are on it.
3. No federal tax credit in 2026. The 30% federal residential credit (Section 25D) ended for systems whose installation was completed after December 31, 2025 — if a quote still subtracts 30% from the battery price, the net number is wrong.

Bottom line

Three good options, all LFP. Powerwall 3 wins on price + AC-starting power for most FL homes; Enphase wins on warranty + modularity; Franklin wins on smart management. Match the battery to your actual backup needs, and don't let a rep oversize you to 2-3 units unless you genuinely need whole-home-for-days.

Got a quote with a battery? I'll tell you if the brand, sizing, and price are right for your home. reviewingsolar.com/upload.