Does this panel really produce more than 440W?

The 440W figure is the front-side rating under standard test conditions. Because it is bifacial, rear-side light can add output, but how much depends on mounting height, tilt and how reflective the surface below is.

Do I need a special inverter for a bifacial panel?

You need an inverter with enough input headroom for the possible rear-side gain, and many installers use dual-input or bifacial-ready models. A standard string inverter can work if the array is sized with margin.

Is the all-black version less efficient than a standard panel?

Module efficiency is rated up to about 22.5%, which is competitive for a residential panel. Dark cells run warmer, which can slightly reduce output on hot days, but the difference is small.

How does it compare with older p-type panels?

N-type cells like these typically degrade less over time and handle low light better than older p-type modules. The trade-off is a higher upfront cost per panel.

What is included when I buy one panel?

It is sold as a single panel. Mounting hardware, cables, connectors and an inverter are not included and must be sourced separately for your system.

Can it be used on a flat roof or ground mount?

Yes. Bifacial panels often do best on raised or flat mounts where light can reach the back, but you need racking that keeps the rear face exposed.

What do buyers say about the JA Solar JAM54D41 440W Bifacial All-Black Solar Panel?

Buyers like: Strong output even on cloudy days; All-black design looks premium on the roof; Solid build quality and easy installation.

Where can I buy the JA Solar JAM54D41 440W Bifacial All-Black Solar Panel?

2 stores we checked sell it, including Rocksolar Technology, eBay.

JA Solar JAM54D41 Bifacial Solar Panel Price History: Lowest $171.60

Q: Where is the JA Solar JAM54D41 440W Bifacial All-Black Solar Panel cheapest?

At Rocksolar Technology, for $171.60, as of our latest check.

What reviewers say

Buyers describe strong, consistent daily output, including on cloudy days and in partial shade, and praise the premium all-black appearance and solid build. Installation is reported as straightforward.

What people mention

Low-light outputPraisedOwners report steady generation on overcast days and in partial shade.
AppearancePraisedThe all-black finish is described as premium-looking on residential roofs.
Build qualityPraisedBuyers call the double-glass construction solid and durable.
InstallationPraisedInstallers report the panel is easy to mount and wire.
Bifacial gainMixedRear-side output helps, but owners say the extra yield depends on the roof surface and mounting height.
WeightCriticisedSome buyers find the double-glass module heavier to handle than standard panels.

From Rocksolar Technology

N-Type double glass bifacial solar panel from JA Solar's DeepBlue 4.0 Pro series
Sleek all-black module design for residential and commercial rooftops
N-type Bycium+ monocrystalline cells with 16-busbar half-cell technology
Cell conversion efficiency up to 26%, module efficiency up to 22.5%
Generates power from both front and rear sides
Low LID and excellent low-irradiance performance

Sizes: 440W, 450W, 455W, 460W
Materials: N-type Bycium+ monocrystalline cells, 108 half cells (6 × 18); 1.6 mm front / 1.6 mm rear glass; black anodized aluminum frame; IP68 junction box, MC4-EVO2 conn
Fit: Dimensions 1762 × 1134 × 30 mm; weight 22 kg
Guarantee: 25-year product warranty and 30-year linear power output warranty; lifetime tech support; 30-day price guarantee matches a lower price found within 30 days of p
Returns: Hassle-free 30-day return policy on eligible products; conditions apply
Shipping: Fast and trackable shipping within the United States; shipping calculated at checkout from your address; pickup available at the USA Fulfillment Center in Las V

Size chart

Rated power (Pmax)	Open circuit voltage (Vo	Max power voltage (Vmp)	Short circuit current (I	Max power current (Imp)	Module efficiency
440 W	38.90 V	32.47 V	14.31 A	13.55 A	22.0%
450 W	40.30 V	32.99 V	14.41 A	13.64 A	22.5%
455 W	40.50 V	33.33 V	14.42 A	13.65 A	22.8%
460 W	40.60 V	33.68 V	14.43 A	13.66 A	23.0%

About the JA Solar JAM54D41 440W Bifacial All-Black Solar Panel

The JA Solar JAM54D41 is an N-type, double-glass, bifacial solar panel from the DeepBlue 4.0 Pro series. It has an all-black design and is made for residential and commercial rooftops. It generates power from both its front and rear sides.

It uses N-type Bycium+ monocrystalline half cells with 16-busbar technology. Cell conversion efficiency is up to 26% and module efficiency is up to 22.5%. The panel has low LID and performs well in low light.