Equipment on Solar Examiner

Enphase IQ8M microinverter review: the grid-independent feature actually works

Sat, 19 Sep 2026 00:00:00 +0000

Enphase’s pitch for the IQ8 line has always been that panels can produce usable power during a grid outage without a battery, as long as the sun is up. We tested this through two utility outages this summer, and it held up both times.

1.5 kWusable daytime backup output

<1sswitchover time observed

25 yrmanufacturer warranty

The limitation is obvious but worth stating plainly: once the sun sets or a cloud bank rolls through, output drops with it. This is sunlight-hours backup, not battery backup, and Enphase is upfront about that in the installer materials even if the marketing headline undersells the caveat.

How to size a home battery without over-buying capacity you'll never use

Sun, 06 Sep 2026 00:00:00 +0000

The fastest way to overspend on a battery is to size it to your total daily usage instead of your overnight critical-load usage, which is usually a third of the total.

The method

List what you actually want powered during an outage: refrigerator, a few lights, internet, and phone charging is typical. Add up the wattage, multiply by the hours of outage you’re planning for, and that’s your target capacity in watt-hours — not your whole home’s daily draw.

Panel degradation rates are quietly improving — warranties haven't caught up

Sun, 30 Aug 2026 00:00:00 +0000

Most 25-year panel warranties still guarantee output based on degradation assumptions written a decade ago — roughly 0.5% annual loss. Independent field data we reviewed from installations five to twelve years old shows top-tier monocrystalline panels degrading closer to 0.3% annually.

This matters for payback calculations more than it sounds: over 25 years, that difference compounds to roughly 4-5 percentage points of additional lifetime output that most solar calculators don’t credit you for, because they use the conservative warranty number by default.