Microinverters vs. string inverters in Florida

• Microinverters (Enphase IQ8) mount under each panel and convert power right there, so each panel works on its own.
• String inverters (Tesla Solar Inverter, SMA, Fronius) are one box on a wall that converts power for a whole string of panels. Tesla's Powerwall 3 has a solar inverter built in.
• Power optimizers (SolarEdge) sit under each panel like microinverters but feed a central inverter on the wall.

Where a wall-mounted inverter goes matters in Florida. SMA's technical guidance says direct sun makes inverters reduce output and recommends shade or an overhang, so a north wall or a shaded spot is better than a west wall in the afternoon sun.

Enphase gives IQ8 microinverters a 25-year limited warranty in the U.S., one of the longest in the industry. Tesla's Solar Inverter carries a 12.5-year warranty and Powerwall 3 a 10-year warranty. String inverters often need replacing once during a panel's life, while a microinverter warranty can match the panels.

Labor matters too: replacing a microinverter means a trip onto the roof, while a wall-mounted inverter can be swapped at ground level. Ask who pays for labor under each warranty. See the best solar panels for Florida.

Florida's building code uses the 2020 National Electrical Code, which requires rooftop systems to drop to a safe voltage within 30 seconds of shutdown so firefighters can work on the roof. The 9th edition of the Florida Building Code, which brings in the 2023 code, takes effect December 31, 2026.

Microinverters meet the rule by design. String systems add panel-level shutdown devices; Tesla says Powerwall 3 meets the 2017, 2020 and 2023 rules with its own devices. Some cities, such as Pembroke Pines, require a signed test of the rapid shutdown before final inspection.

Panel-level electronics (microinverters or optimizers) help most when part of the array is shaded by trees or roof features, because one shaded panel doesn't drag down the rest. NREL testing found module-level electronics can recover part of the energy lost to shade. On an open, south-facing roof with no shade, the difference is small.

• Enphase: IQ Batteries are AC-coupled with built-in microinverters, and Enphase's Sunlight Backup can power high-priority loads during a daytime outage even without a battery, using an Enphase system controller.
• Tesla: Powerwall 3 has a solar inverter built in, so solar and battery share one box, which can simplify a new solar-plus-battery install.
• Without a battery or Sunlight Backup, most grid-tied systems shut off in an outage for safety.

See the best home batteries for Florida and solar battery backup for hurricanes.

For new installs, possibly. On July 28, 2026, the FCC added foreign-produced connected power inverters to its Covered List, which stops new models from getting the FCC authorization they need to be sold. In August it narrowed the rule to grid-tied inverters and excluded those that qualify as U.S.-made under the federal manufacturing credit or Buy American rules.

Inverters already on roofs, and models the FCC authorized before the rule, aren't affected. For a new system, ask your installer to confirm the inverter model is authorized and likely to have replacement parts for its whole warranty.

Check the pairing. Enphase's IQ8 models range from about 240 to 380 VA of continuous output, so a high-wattage panel on a smaller microinverter can lose some output at midday, called clipping. In June 2026 Enphase launched the IQ9N, a gallium nitride microinverter rated 427 VA and built for high-wattage panels, with a 25-year limited warranty, and it works alongside IQ7 and IQ8 units on the same system.

Ask each installer which panel and inverter they're pairing and how much output they expect to be clipped. See the best solar panels for Florida.

A long warranty depends on the company standing behind it. SolarEdge posted large losses in 2024 and 2025 and cut jobs several times before returning to an operating profit in mid-2026. Enphase cut about 6% of its staff in February 2026, citing the end of the homeowner tax credit. Both remain major suppliers, but it's worth asking your installer how warranty claims are handled.