Tesla T420S (420W) Solar Panels

Tesla has sold more than one panel with a 420W rating. This page is specifically about T420S, the model identified in the supplied T420S, T425S and T430S module datasheet. That document lists a 144-cell arrangement and the electrical values shown below. A shared wattage does not make two product generations interchangeable, particularly when their cell architecture, mounting hardware or marketing claims differ.

The separate Tesla brochure supplied for this project describes 18 power zones, a feature confirmed in official documentation for newer TSP-415 and TSP-420 panels. The T420S sheet does not make that claim. We therefore do not promise 18-zone shade behavior or treat the newer brochure as proof of T420S construction. Your proposal should name the exact module rather than simply saying Tesla (420W), so you know which specifications and warranty documents apply.

The T420S is 2094 mm long and 1038 mm wide, with a listed weight of 25.3 kg. Its length and orientation can influence how neatly it fits around hips, roof edges and obstructions. A tile or metal roof with ample area may offer several layout choices, while a more segmented roof needs careful planning. We map the real module footprint rather than estimating panel count from square footage alone.

Florida installation requirements concern the completed array, not simply the brand printed on the module. Attachment locations, structural review, roof waterproofing and local permitting must work together. The panel is not described here as hurricane-proof, and its product warranty is not represented as blanket storm insurance. If the roof needs repair or replacement, we review that work first so the solar installation does not create an avoidable removal-and-reinstallation project later.

A Tesla-branded panel does not provide home backup on its own. In a conventional grid-connected arrangement, solar production shuts down during a grid interruption unless the system has the equipment needed to operate safely in backup mode. Adding a Powerwall changes the system design, supported loads and controls. Battery sizing should follow your backup priorities, rather than being inferred from a panel logo or total array wattage.

Powerwall 3 can be evaluated with an appropriate new solar design or an AC-coupled existing array. The selected configuration determines inverter requirements and monitoring. If you also want EV charging, we consider vehicle charging loads alongside the household energy history. Generation, storage and charging can be planned as a coordinated project, but their benefits are distinct. We do not promise uninterrupted whole-home operation or a specific runtime without assessing the actual loads and battery arrangement.

The supplied Tesla sheet gives a 25-year materials and processing warranty and an additional 25-year linear power warranty. These are two different obligations. The power schedule allows 2% degradation in the first year and 0.54% annually afterward, with an 85% warranted threshold at year 25. That is a module performance commitment, not a guarantee of the same annual kilowatt-hours throughout the life of your installation.

A household bill also depends on usage, weather, shade, utility rules and how the system operates. Neither the retention percentage nor a Tesla app display creates a savings guarantee. Labor, removal, shipping and reinstallation should be checked in the applicable written claim terms instead of assumed from a coverage headline. We keep the installation warranty separate so you can see who is responsible for the module, the workmanship and any optional battery equipment.