Solar panels
Silfab SIL-440 QD Solar Module
7 of 10 catalogued products have a real, seller-observed per-module price from Solar Cellz USA (store.solarcellzusa.com), a public online solar- equipment retailer selling individual modules ($201-$400/panel range observed). That is 70% coverage — meets the >=70% P3c/P7 gate exactly, not comfortably. The 3 unpriced products (Maxeon 7, LONGi Hi-MO X6 Scientist, JinkoSolar Tiger Neo) sell almost exclusively through installer/distributor channels rather than public retail; left unpriced rather than estimated, per this project's no-invented-numbers rule (see price_seed.py's own note on this). Two priced observations are for a smaller-wattage or earlier-generation module from the same manufacturer (REC's older 420W Alpha vs. the catalogued Pure-RX; Canadian Solar's TOPHiKu6 vs. the catalogued HiKu7) and are flagged as proxies, not exact SKU matches, in price_seed.py directly.
22.6% efficient North American-manufactured module with a 30-year warranty.
Our take
Silfab builds in Washington State and Ontario, which matters for buyers who care about supply chain provenance and for projects with domestic-content requirements. The 30-year warranty splits the difference between the mainstream 25 and Maxeon's 40, and efficiency is genuinely competitive.
Best for
Buyers weighing North American manufacturing, or projects with domestic content requirements.
Watch out for
Installer availability is regional. Confirm your installer stocks it.
What sellers are actually charging
Real listings, read on the date shown. Prices change — click through to check before you act on any of them.
| Seller | What you get | Price | Seen |
|---|---|---|---|
| Solar Cellz Inc
online retailer |
Silfab SIL-420-QD — same product family as the catalog's SIL-440 QD entry, at a smaller 420W wattage variant
SIL-420-QD |
$225 | 2026-08-16 |
Equipment price is not installed price. The listings above are what the hardware costs. Installation — labour, electrical, refrigerant lines, permits, removing the old system — is typically a similar amount again, and varies more between contractors than between brands. Where we have an installed figure it is labelled as such and comes from someone who actually installs.
Compare against
Canadian Solar HiKu7 Solar Module
21.6-22.7% efficient module positioned on cost per watt rather than peak specification.
JA Solar DeepBlue 4.0 Pro (JAM54D41) Solar Module
22-22.8% efficient module with a notably shorter product warranty than every other panel in this catalog.
JinkoSolar Tiger Neo (JKM-N-54HL4R-BDB) Solar Module
21-22.5% efficient N-type module substituting for LG in this catalog, since LG exited solar panel manufacturing in June 2022.
Maxeon 7 Residential Solar Module
24.1% efficient module with a 40-year warranty and the lowest degradation rate on the market.
Before you buy this
Ask what the production estimate is based on — an actual shading analysis or a rule of thumb — and what export rate it assumes; net metering rules move the payback more than any panel spec. Confirm the quote isn't still claiming the 30% federal credit: it expired for anything placed in service after 31 December 2025. If financed, ask for the all-in cost including interest, not just the monthly payment.