The Renogy 640W (2 x 320W) N-Type 18BB Rigid Solar Panel 2-Pack and the HISHEN FLOWE 495W N-Type Frameless Dual-Glass Rigid Solar Panel (HN-SP-495W-N-CE-1, UL 61730) are evenly matched, rated 4.0 and 4.0. The Renogy 640W (2 x 320W) N-Type 18BB Rigid Solar Panel 2-Pack leads on durability. The HISHEN FLOWE 495W N-Type Frameless Dual-Glass Rigid Solar Panel (HN-SP-495W-N-CE-1, UL 61730) wins on value. The HISHEN FLOWE 495W N-Type Frameless Dual-Glass Rigid Solar Panel (HN-SP-495W-N-CE-1, UL 61730) costs $250 less ($349.99 vs $599.99).
A large-panel pair for a cabin, shed or ground-mount array with a high-voltage MPPT controller. Too big and too high-voltage for most van and small RV setups.
Amazon $599.99 Renogy $599.99A 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 $349.99Prices were last checked October 21, 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 | Renogy 640W (2 x 320W) N-Type 18BB Rigid Solar Panel 2-Pack | HISHEN FLOWE 495W N-Type Frameless Dual-Glass Rigid Solar Panel (HN-SP-495W-N-CE-1, UL 61730) |
|---|---|---|
| Overall rating | 4.0/5 | 4.0/5 |
| Value 45% | 54 $0.94 per rated watt | 76 $0.71 per rated watt |
| Tested output 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Durability 25% | 100 IP68, 10-year warranty | 60 no IP rating, 10-year warranty |
| Efficiency 15% | 100 25% claimed efficiency | 100 25.6% claimed efficiency |
| Renogy 640W (2 x 320W) N-Type 18BB Rigid Solar Panel 2-Pack | HISHEN FLOWE 495W N-Type Frameless Dual-Glass Rigid Solar Panel (HN-SP-495W-N-CE-1, UL 61730) | |
|---|---|---|
| Output | ||
| Rated power | 640 W | 495 W |
| Efficiency | 25% (cell efficiency, "up to"; datasheet module efficiency 22.2%) | 25.6% (cell efficiency, as published in the title) |
| Cells | Monocrystalline (N-type, 18BB (per Renogy's product page and Amazon; the datasheet says only monocrystalline, 60 cells)) | Monocrystalline (N-type, 16BB, Grade A+) |
| Bifacial | No | - |
| Electrical | ||
| Open-circuit voltage (Voc) | 43.8 V | - |
| Voltage at max power (Vmp) | 37.9 V | - |
| Short-circuit current (Isc) | 8.9 A | - |
| Current at max power (Imp) | 8.5 A | - |
| Voc temperature coefficient | -0.3%/°C | - |
| Connections | ||
| Output connector | Solar connectors (IP68) | - |
| Build | ||
| Dimensions | 64.6 x 34.7 x 1.4 in (each panel) | 70 x 45 x 1.2 in |
| Frame | anodized aluminum alloy | frameless ("Cleanedge" design) |
| Glass | 3.2 mm tempered | 2.0 mm dual-glass |
| Junction box rating | IP68 | - |
| Warranty | 10 years | 10 years |
| Output warranty | 95% output for 5 years, 90% for 10 years, 80% for 25 years | - |
