The REC Alpha Pure-RX 460 is the better rigid solar panel overall, rated 4.4 to 4.1. The REC Alpha Pure-RX 460 leads on value. The REC Alpha Pure-RX 460 costs $84.33 less ($285.66 vs $369.99).
A premium heterojunction panel for a home rooftop where space is tight and long-term output matters most. Check that your inverter or microinverters accept its higher voltage.
A1 Solar Store $285.66 The Solar Store $339.95 US Solar Supplier $349.99 Solar Cellz USA $369.59A large bifacial panel with a longer warranty than most, for a home rooftop, shed or ground-mount array on a 24 V or 48 V system or a grid-tie inverter. Too big and too high-voltage for most RV and van setups.
Amazon $369.99Prices 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 | REC Alpha Pure-RX 460 | Callsun 450W Bifacial Double-Glass |
|---|---|---|
| Overall rating | 4.4/5 | 4.1/5 |
| Value 45% | 84 $0.62 per rated watt | 65 $0.82 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, 20-year warranty | 100 IP68, 10-year warranty |
| Efficiency 15% | 82 22.1% module efficiency | 90 22.5% module efficiency (from size and rated power) |
| REC Alpha Pure-RX 460 | Callsun 450W Bifacial Double-Glass | |
|---|---|---|
| Output | ||
| Rated power | 460 W | 450 W |
| Module efficiency | 22.1% | 22.5% (rated power over panel area) |
| Claimed efficiency | 22.6% ("22.6% max efficiency" is the 470 W version's panel efficiency; the 460 W version is 22.1%) | 25.6% (cell efficiency per Callsun's manual and the Amazon listing; Callsun's product page says 25.4%) |
| Cells | Monocrystalline (Heterojunction (HJT), 88 half-cut cells, gapless layout) | Monocrystalline (N-type, 16BB, 182 mm cells, wired as two parallel halves for shade tolerance) |
| Bifacial | No | Yes |
| Electrical | ||
| Open-circuit voltage (Voc) | 65.7 V | 35.8 V |
| Voltage at max power (Vmp) | 54.9 V | 29.7 V |
| Short-circuit current (Isc) | 8.9 A | 16 A |
| Current at max power (Imp) | 8.4 A | 15.1 A |
| Voc temperature coefficient | -0.2%/°C | -0.2%/°C |
| Series / parallel | Yes | - |
| Connections | ||
| Output connector | Stäubli MC4 (PV-KBT4/KST4) | Solar connectors |
| Build | ||
| Weight | 50 lb (22.7 kg) | 52.8 lb (24 kg) |
| Dimensions | 68.0 x 47.4 x 1.2 in | 69.4 x 44.7 x 1.2 in |
| Frame | black anodized aluminum | anodized aluminum alloy |
| Glass | 0.13 in (3.2 mm) solar glass with anti-reflection surface treatment | double glass: 2.0 mm AR-coated heat-strengthened front, 2.0 mm heat-strengthened back |
| Junction box rating | IP68 | IP68 |
| Warranty | 20 years | 10 years |
| Output warranty | 25 years: at least 98% in year 1, then no more than 0.25% loss a year (92% at 25 years) | 84.5% output after 25 years |
| Released | 2023-09 | 2026-07 |
