The HISHEN FLOWE 495W Frameless is the better rigid solar panel overall, rated 4.0 to 3.9. The HISHEN FLOWE 495W Frameless leads on efficiency. The Renogy 640W (2 x 320W) Bifacial 2-Pack wins on durability. The HISHEN FLOWE 495W Frameless costs $147.35 less ($339.99 vs $487.34).
A frameless dual-glass large panel for home rooftop, shed or ground-mount buyers who want edges that shed dirt and snow. The missing electrical specs make it a harder buy than framed panels with full data sheets.
Amazon $339.99A low-cost bifacial pair for a ground mount or shed roof over light gravel or concrete, where the back side can earn its keep. On a dark roof, Renogy’s N-type 320 W pair is the better panel.
Amazon $487.34Prices were last checked October 26, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Each factor is scored 0-100 against the same fixed reference points for every 150 W and up rigid solar panel; a clear win is highlighted. How we rank explains each one.
| Factor weight | HISHEN FLOWE 495W Frameless | Renogy 640W (2 x 320W) Bifacial 2-Pack |
|---|---|---|
| Overall rating | 4.0/5 | 3.9/5 |
| Value 45% | 77 $0.69 per rated watt | 70 $0.76 per rated watt |
| Tested output 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Durability 25% | 60 no IP rating, 10-year warranty | 100 IP68, 10-year warranty |
| Efficiency 15% | 100 24.4% module efficiency (from size and rated power) | 24 19.2% module efficiency |
| HISHEN FLOWE 495W Frameless | Renogy 640W (2 x 320W) Bifacial 2-Pack | |
|---|---|---|
| Output | ||
| Rated power | 495 W | 640 W |
| Module efficiency | 24.4% (rated power over panel area) | 19.2% |
| Claimed efficiency | 25.6% (cell efficiency, as published in the title) | 19.2% (module efficiency from the datasheet; no cell efficiency published) |
| Cells | Monocrystalline (N-type, 16BB, Grade A+) | Monocrystalline (PERC, 10BB, half-cut, 90 cells (per the Amazon listing and datasheet)) |
| Bifacial | - | Yes |
| Electrical | ||
| Open-circuit voltage (Voc) | - | 30.4 V |
| Voltage at max power (Vmp) | - | 26.1 V |
| Short-circuit current (Isc) | - | 13.1 A |
| Current at max power (Imp) | - | 12.3 A |
| Voc temperature coefficient | - | -0.3%/°C |
| Series / parallel | - | Yes |
| Connections | ||
| Output connector | - | Solar connectors (IP68) |
| Build | ||
| Dimensions | 70 x 45 x 1.2 in | 67.9 x 38.0 x 1.4 in (each panel) |
| Frame | frameless ("Cleanedge" design) | anodized aluminum alloy |
| Glass | 2.0 mm dual-glass | 3.2 mm tempered |
| Junction box rating | - | IP68 |
| Warranty | 10 years | 10 years |
| Output warranty | - | 25-year power output warranty |
| Released | - | 2025-07 |
