What is the JAM66D46-715-740/LB?
- Power per panel: 715 / 720 / 725 / 730 / 735 / 740 W at 0~+3% tolerance — the highest-output JA Solar module we can verify against an official datasheet today
- Module efficiency: 23.0–23.8%, with the 740W bin reaching 23.8%, the highest of the three models we document
- Cell technology: n-type TOPCon (n-Bycium+ 18BB, MBB half-cell, mono), 132 cells in a 6×22 layout, cell efficiency up to 26%
- Size and weight: 2384±2 × 1303±2 × 33±1 mm, 38.2 kg — a genuinely large module that needs lifting equipment and crew planning
- Electrical and warranty: Voc 49.80 V / Isc 18.73 A on the 740W bin, 35 A maximum series fuse, 12-year product and 30-year linear output warranty
The JA Solar JAM66D46 LB 740W is the high-output dual-glass n-type TOPCon module in the DeepBlue 4.0 Pro series, built for projects where maximum watts per panel cuts the module count, string count and structural cost per kilowatt. Our engineering team specifies panels at this level for factory roofs, warehouses and large flat-roof arrays across Phuket, Phang Nga and Krabi. The trade-off is physical: at 2384 mm long and 38.2 kg, this is not a module you casually carry up a house roof. This page explains when a panel this size pays for itself and when you should step back to a standard format. To size a system first, use the calculator, then see what our services cover from design through commissioning.
What is the JAM66D46 LB, and why is it strictly a project-scale module?
The JAM66D46 LB uses n-type TOPCon n-Bycium+ 18BB half-cells, 132 of them in a 6×22 layout, on a 2384 × 1303 × 33 mm frame weighing 38.2 kg. Output runs from 715 W to 740 W with module efficiency of 23.0–23.8%, the top of this series. The difference from a standard-format module is not only wattage but current: the 740W bin delivers Imp 17.64 A and Isc 18.73 A with a 35 A maximum series fuse, which means DC cable, fusing and the inverter's MPPT inputs all have to be rated for that current, not just for voltage. The dual-glass bifacial build carries a bifaciality figure of 80% ±5%, so it rewards flat concrete roofs and light surfaces where the array sits high enough for reflected light to reach the rear face. Among its siblings, the JAM72D40 GB is the standard format that fits nearly any roof and the JAM54D41 LB is the shorter all-black residential module, while the JAM66D46 LB exists specifically to reduce the number of pieces on a large job. You can see the rest of the hardware we pair it with on the equipment page, and if part of the load needs to survive an outage, read about a hybrid with battery backup. All figures come from the Global-EN datasheet, which the manufacturer notes is subject to technical change, so we verify the current revision before every design.
Highlights from the datasheet
- 23.8% module efficiency at 740 W: higher output per panel means fewer modules, fewer clamps, fewer MC4 connections and less rail across the whole project — costs that hide inside a quotation but show up plainly on site
- High current: Isc 18.73 A with a 35 A series fuse: the spec most people overlook. High-power modules draw more current, so DC cable sizing, fuses and the inverter's MPPT inputs must all be rated accordingly rather than carried over from a small-panel design
- Temperature coefficient of −0.290 %/°C: identical to the rest of the series, so you gain output per panel without giving up hot-weather behaviour — which is the normal operating condition on a southern Thai roof
- 18 busbars across 132 cells (6×22): more busbars spread current within each cell and reduce the impact of micro-cracks, which is the structural reason modern high-power modules hold efficiency at this size
- Static load 5400 Pa front / 2400 Pa back: the datasheet gives a combined maximum static load without splitting wind from snow, and it notes that mounting on a tracker system requires a compatibility confirmation from the manufacturer first
- 38.2 kg per module: verify that the roof structure and purlins accept the total distributed load, and plan crew size, lifting equipment and the route up the building before the first delivery arrives
- 12-year product and 30-year linear output warranty: no more than 1% degradation in year one and 0.4% per year afterwards — the figures we use when modelling long-term project returns
Key specifications (JAM66D46-715-740/LB)
| Specification | Datasheet value |
|---|---|
| Rated Maximum Power (Pmax) | 715 / 720 / 725 / 730 / 735 / 740 W (ค่าคลาดเคลื่อนกำลังไฟ 0~+3%) |
| Module Efficiency | 23.0–23.8 % (รุ่น 740W = 23.8 %) |
| Cell Type | n-type TOPCon (n-Bycium+ 18BB, MBB Half-Cell, Mono) — ประสิทธิภาพเซลล์สูงสุด 26% |
| No. of Cells | 132 เซลล์ (6×22) |
| Vmp / Imp at STC | 41.00–41.96 V / 17.44–17.64 A (รุ่น 740W = 41.96 V / 17.64 A) |
| Voc / Isc at STC | 48.80–49.80 V / 18.55–18.73 A (รุ่น 740W = 49.80 V / 18.73 A) |
| Temperature Coefficient of Pmax | −0.290 %/°C (Voc −0.250 %/°C, Isc +0.045 %/°C) |
| Dimensions | 2384±2 × 1303±2 × 33±1 มม. |
| Weight | 38.2 กก. |
| Maximum Static Load (Front / Back) | ด้านหน้า 5400 Pa (112 lb/ft²) / ด้านหลัง 2400 Pa (50 lb/ft²) |
| Bifaciality | 80 % ±5 % |
| Maximum System Voltage / Max Series Fuse Rating | 1500 V DC / 35 A |
| Operating Temperature | −40 °C ถึง +85 °C (NOCT 45±2 °C) |
| Product Warranty | 12 ปี |
| Linear Power Output Warranty | 30 ปี (แบบเชิงเส้น) |
| 1st-year / Annual Degradation | ปีแรก 1 % · ปีถัดไป 0.4 % ต่อปี ตลอด 30 ปี |
Note: every figure above comes straight from the JA Solar Technology Co., Ltd. (晶澳太阳能科技股份有限公司) datasheet. Actual system design (strings per MPPT, cable sizing, breakers) must be calculated for each site.
Why this model suits Phuket
- Hotels and factories have big roofs but little downtime: at 740 W per panel there are far fewer pieces to install, so the array goes up faster and disrupts operations for fewer days
- Year-round heat: the −0.290 %/°C coefficient limits output loss when modules run hot, which is the everyday condition on an industrial roof in southern Thailand
- Flat concrete roofs and bright surfaces: the dual-glass 80% ±5% bifacial build earns its keep when the array is raised and the surface below reflects well — common on commercial rooftop installations here
- Strong wind and high humidity: larger modules catch more wind, so we calculate fixing points and clamp spacing from the manufacturer's manual, using the 5400 Pa front / 2400 Pa back static load rating as the design envelope
Who it suits
- Factories and warehouses: long metal roof planes, structure that carries the load, and a clear objective of cutting rows and structural cost per kilowatt
- Large hotels and resorts: wide flat roofs where the goal is maximum installed capacity in one phase to offset daytime air-conditioning consumption
- Ground-mount arrays and solar farms: no lifting constraints, so you get the full benefit of high output per panel and bifacial rear-side gain
- Owners comparing cost per kW: fewer modules means less rail, fewer clamps, less cable and lower labour per kilowatt — useful when a payback number has to clear a board
- Where not to use it: ordinary house roofs with short planes, timber roof structures, or sites with narrow access — a standard-format or residential module is the better call there
Summary
The JAM66D46 LB 740W is the choice when you want the highest output per panel we can verify from official documentation: up to 23.8% module efficiency, a −0.290 %/°C temperature coefficient and a 30-year linear output warranty, in exchange for a 2384 × 1303 mm, 38.2 kg module that demands proper structural and logistics planning. Our engineers size the strings, select an inverter that genuinely handles the current, and handle the PEA permits for you. For a building-specific layout and an honest view of the solar cost in Phuket, contact our team.
See other models from this brand on the JA Solar overview, or browse all the equipment we install.
Download the datasheet (PDF) — full manufacturer specification sheet