Microinverters vs String Inverters: Why We Default to Enphase
The inverter is the brain of your solar system. Here’s the real difference between the two main approaches — and why we usually pick one.
Panels make DC power; an inverter turns it into the AC your home uses. The big design choice is where that conversion happens.
String inverters
One central inverter handles a whole “string” of panels. They’re cost-effective and proven, but the string tends to perform at the level of its weakest panel — so shade or debris on one module can drag down the rest. Great for big, unshaded arrays (which is why we often use them on commercial and ground-mount projects).
Microinverters
A small inverter sits under each panel, so every module produces independently. One shaded panel no longer drags down its neighbors, you get panel-level monitoring in an app, and there’s no single high-voltage DC point of failure — a safety plus.
Why we default to Enphase
On most residential roofs — with their dormers, chimneys and partial shade — microinverters simply produce more and tell you more. iSolar defaults to Enphase IQ8 microinverters for homes: strong cold-weather performance, granular monitoring, and a clean upgrade path to Enphase batteries. We’ll recommend a string inverter when the site genuinely calls for it — the design should fit the roof, not a sales sheet.
Frequently asked.
Are microinverters worth the extra cost?
On shaded or complex residential roofs, usually yes — more production and panel-level monitoring. On large unshaded arrays, a string inverter can be the better value.
What about hybrid inverters?
Those are a third path for solar-plus-battery and off-grid — see our hybrid inverter guide.
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