Enphase, Franklin, or Powerwall?

Last updated: September 16, 2026

The architectural difference that actually matters

The meaningful split isn't capacity, it's whether the system is modular or monolithic.

Enphase is modular and built around microinverters. Power conversion is distributed across many small units rather than concentrated in one box. Practically: one failure degrades the system rather than stopping it, capacity comes in smaller increments so you can size closely to your evening load, and it pairs naturally if you already have Enphase microinverters on the roof. The tradeoff is more components and a higher price per kilowatt-hour.

Tesla Powerwall 3 is the monolithic approach, with the solar inverter integrated into the unit. Fewer parts, clean installation, strong power output for its size, and the best consumer app of the three. The tradeoffs are a larger minimum increment, a single point of failure for conversion, and a service relationship that runs through Tesla.

Franklin aPower sits between them and is unusually flexible about what it will work with, including existing arrays from other manufacturers. Its whole-home switching is well designed. It's the newest of the three names in most homeowners' minds, which for some people is itself a consideration.

How I actually choose

These are tendencies, not rules. Your panel location, where the battery can legally and sensibly be mounted, and what your evening load actually looks like will override any of them.

What I'd ignore

• Round-trip efficiency arguments. The differences between these three are small enough to disappear next to sizing and placement.
• Headline cycle counts. All three will outlast the warranty period under normal residential use.
• Brand loyalty in either direction. I install all three and don't get paid more for one.

What I'd look at closely

• Where it physically goes. Garage wall, exterior wall, clearances, and our temperature swings. This decides more installs than anything on a spec sheet.
• The warranty's owner. Ten years is standard; who is actually on the hook, and will they be reachable, is the real question.
• What backup you're getting. Critical-loads subpanel or whole home — know which you bought before the first outage, not during it.
• Monitoring you'll actually use. You'll look at the app constantly for a month and rarely after that, but when something's wrong you want it to tell you plainly.