Solar Batteries in 2026: Powerwall vs. Enphase vs. Franklin

A solar battery is the most over-sold — and most misunderstood — part of a solar quote. Sometimes it's essential; often it's an expensive add-on that stretches your payback. And if you do want one, the brand matters. Here's how the main 2026 options compare, and when a battery is actually worth it.

First: do you even need one?

A battery makes the most sense if (a) you have frequent outages and want backup, or (b) your utility pays little for exported solar (like California's NEM 3.0), so storing your own power beats selling it back cheap. With full retail net metering and a reliable grid, a battery is often optional. We go deep here: do you really need a solar battery?

The main options in 2026

• Tesla Powerwall 3 — ~13.5 kWh with a solar inverter built in (which can simplify a new install). Strong whole-home backup, widely installed.
• Enphase IQ Battery — modular (add capacity in smaller increments), AC-coupled so it pairs cleanly with Enphase microinverter systems, known for safety + granular monitoring.
• FranklinWH (aPower) — ~13.6 kWh with a smart whole-home management system; a strong all-rounder for backup.

What actually matters when comparing

• Usable capacity (kWh) — how much you can actually store and use.
• Continuous + peak power (kW) — whether it can run big loads like AC during an outage.
• Whole-home vs. partial backup — what it actually keeps on when the grid's down.
• Warranty — typically ~10 years; check the throughput/cycle terms.

The honest take

Don't let a battery be slipped into your quote as a default. Get the quote with and without it, understand why it's there, and size it to your real backup needs or rate structure — not the salesperson's commission. For a gut-check on whether the battery in your quote is justified, get a free review.