Use the tool for product-level screening, not final engineering
The panel-count estimate uses the highest watt class currently tracked for each product family and rounds up to a whole module. A real installer design can land above or below the target DC size because roof geometry, electrical limits, available watt classes and inverter compatibility matter.
Need the technology context first? Open the visual HJT vs TOPCon guide. For long-term output, see the degradation and warranty guide.
Enter 1-30 kW. Panel count uses the highest watt class currently tracked for each product family.
Compare 2 or 3 panels at a time.
Alpha Pure-RX
Q.TRON BLK M-G2+
SIL-440 QD
| Specification | REC Alpha Pure-RX | Qcells Q.TRON BLK M-G2+ | Silfab SIL-440 QD |
|---|---|---|---|
| Power range | 450-470 W | 415-440 W | 440 W |
| Maximum efficiency | 22.6% | 22.5% | 22.6% |
| Cell technology | HJT (heterojunction) | N-type TOPCon / Q.ANTUM NEO | N-type silicon |
| Dimensions / area | 22.4 ft² module area | See current Qcells datasheet | 1721 × 1133 × 35 mm / 67.8 × 44.6 × 1.37 in |
| Weight | See current REC datasheet by watt class | See current Qcells datasheet | 21 kg / 46.3 lb |
| Product warranty | 20 years standard; 25 years with eligible REC ProTrust | 25 years | 12 years standard; extendable to 25 years subject to registration and conditions |
| Performance warranty | 25 years | 25 years | 30-year linear power performance guarantee |
| End-of-term performance | 92% minimum power in year 25 | At least 90.58% nominal power at year 25 | 89.3% minimum at year 30 |
Higher module efficiency matters most when usable roof area is constrained. Wattage alone can be misleading if module dimensions differ.
Use the product warranty, performance term and end-of-term power together. Conditions and registration requirements still matter.
The panel with the strongest datasheet is not automatically the best proposal. Check system production, inverter design and solar-only cash $/W.
Move from module comparison to a complete solar decision
Panel specifications are only one part of a residential solar proposal. Compare roof fit, expected annual production, inverter architecture, solar-only cash price per watt and installer scope before choosing between quotes.
Specifications were last checked against manufacturer sources on August 27, 2026. Product availability, watt classes and warranty conditions can change. Verify the current datasheet and warranty before purchase.