Specs & why they matter

• Typically 400–500 W per module on a residential roof today
• Tempered glass over crystalline-silicon cells in an anodised aluminium frame
• Power output is normally warranted for 25 years — the longest-lived part of the system
• Degrades slowly and predictably, so a sudden drop in production almost never starts here

Specs & why they matter

• No per-panel electronics — the modules are wired in series as one string
• Fewer parts on the roof, which is the main argument for a string design
• The trade-off: the string is measured as a whole, so one weak panel pulls on the rest
• Rapid shutdown is handled at the array, to NEC 690.12

Specs & why they matter

• 13.5 kWh nominal energy
• Powerwall 3 has the solar inverter built in — up to 20 kW STC of panels across 6 MPPTs
• 5.8, 7.6, 10 or 11.5 kW continuous depending on configuration
• 97.5% solar-to-home efficiency
• 10-year warranty; up to 4 units, plus up to 3 Expansion units
• Rated −4°F to 122°F, which matters more in Texas than the brochure suggests

Specs & why they matter

• Watches the grid and islands the house the instant the utility drops
• Handles up to a 200 A service
• Where the whole-home-versus-partial-backup decision physically lives
• Also the metering point Tesla’s app reads to tell solar, house and grid apart

Specs & why they matter

• Up to 48 A / 11.5 kW on a 60 A circuit
• Roughly 44 miles of range an hour on a Tesla
• Wi-Fi connected, so charging can be scheduled against what the roof is making

Specs & why they matter

• Live view of solar, Powerwall, home and grid, updated continuously
• Daily and lifetime history, so a gradual decline shows up against last year
• Outage and Storm Watch alerts reach you before you notice the lights