CAN YOU BUILD YOUR OWN BALCONY SOLAR SYSTEM?
Technically, sometimes. Legally and safely, it's more complicated than buying a panel and a microinverter separately. Here's why.
UL 3700 TESTS THE WHOLE SYSTEM - NOT THE PARTS.
UL 3700 is the safety standard that launched in January 2026 specifically for plug-in solar systems. It tests the COMBINATION of panel, microinverter, and cabling working together as one unit - not each piece in isolation.
A "UL-LISTED" PANEL PLUS A "UL-LISTED" MICROINVERTER ISN'T THE SAME AS A UL 3700-CERTIFIED SYSTEM.
This is the part that trips people up. Plenty of individual solar panels and microinverters on the market carry SOME UL certification - but that typically covers the component on its own, for general electrical safety - not the SPECIFIC combination's behavior as a complete plug-in system.
If you buy a panel from one manufacturer and a microinverter from another, and connect them yourself, that exact combination has almost certainly never been tested together. There's no guarantee the anti-islanding protection, the shutoff timing, or the overload behavior works the way it would in a tested kit.
MOST STATE LAWS REQUIRE UL 3700 CERTIFICATION SPECIFICALLY.
Several signed state laws explicitly reference UL 3700 (or an equivalent certification) as a requirement for the higher-wattage tier. A self-assembled system built from separately sourced components would not carry this certification - meaning it likely would not be considered compliant, even if every individual part happens to be UL-listed on its own.
COMBINE CERTIFIED KITS INSTEAD OF MIXING COMPONENTS.
If you want more control over your system's total size, brand mix, or budget than a single kit offers, you can combine MULTIPLE complete, certified kits - rather than mixing individual parts.
Each kit is independently certified on its own. Running two separate 395W certified kits side by side gets you 790W of certified capacity, within a single state's wattage limit, without ever creating an untested combination.